60297-25 - OPERATORS MANUAL - O-360 76 SERIES...

AlLYCOMINODIVIION

OPERATOR'S MANUALREVISION

REVISION No. PUBLICATION PUBLICATION No. PUBLICATION DATE

0-360 76 Series 60297-2560297-25-1 Operator Manual 1st Edition May, 1978

The page(s) furnishedherewith are intended either to replace, add to, or deletepages in the basic manual.

Previous revisions to this publication This revision consists of:-

November, 1980

1-1, 1-2, 1-32-13-3, 3-4, 3-5, 3-8, 3-115-10, 5-128-5

OPERATORSMANUAL

AVCO LYCOMING

0-360

AIRCRAFT

1st Edition

Approved

76 SERIES

ENGINES

May 1978

By F.A.A.

PART N. 60297-25 PRICE $5.00

.:;AVCO LYCOMING WILLIAMSPORT DIVISIONAVCO CORPORATION

WILLIAMSPORT, PENNSYLVANIA 17701

Printed In U.S.A.

AVCO LYCOMING 76 SERIES OPERATOR'S MANUAL

ATTENTION

OWNERS, OPERATORS, ANDMAINTENANCE PERSONNEL

This operator's manual contains a description of the engine, itsspecifications, and detailed information on how to operate and maintainit. Such maintenance procedures that may be required in conjunction withperiodic inspections are also included. This manual is intended for use byowners, pilots and maintenance personnel responsible for care of AvcoLycoming powered aircraft. Modifications and repair procedures arecontained in Avco Lycoming overhaul manuals; maintenance personnelshould refer to these for such procedures.

SAFETY WARNING

Neglecting to follow the operating instructions and to carry out periodicmaintenance procedures can result in poor engine performance and powerloss. Also, if power and speed limitations specified in this manual areexceeded, for any reason; damage to the engine and personal injury canhappen. Consult your local FAA approved maintenance facility.

SERVICE BULLETINS, INSTRUCTIONS, AND LETTERS

Although the information contained in this manual is up-to-date at timeof publication, users are urged to keep abreast of later informationthrough Avco Lycoming Service Bulletins, Instructions and Service Letterswhich are available from all Avco Lycoming distributors or from thefactory by subscription. Consult the latest edition of Service Letter No.L114 for subscription information.

SPECIAL NOTE

The illustrations, pictures and drawings shown in this publication aretypical of the subject matter they portray; in no instance are they to beinterpreted as examples of any specific engine, equipment or part thereof.

TEXTRON LYCOMING OPERATOR'S MANUAL

IMPORTANT SAFETY NOTICE

Proper service and repair is essential to increase the safe, reliableoperation of all aircraft engines. The service procedures recommendedby Textron Lycoming are effective methods for performing serviceoperations. Some of these service operations require the use of toolsspecially designed for the task. These special tools must be used whenand as recommended.

It is important to note that most Textron Lycoming publications con-tain various Warnings and Cautions which must be carefully read inorder to minimize the risk of personal injury or the use of improper ser-vice methods that may damage the engine or render it unsafe.

It is also important to understand that these Warnings and Cautionsare not all inclusive. Textron Lycoming could not possibly know,evaluate or advise the service trade of all conceivable ways in which ser-vice might be done or of the possible hazardous consequences that maybe involved. Acordingly, anyone who uses a service procedure must firstsatisfy themselves thoroughly that neither their safety nor aircraft safe-ty will be jeopardized by the service procedure they select.

Lycoming

WARRANTY(LIMITED)

REPLACEMENT PART - RECIPROCATING AIRCRAFT ENGINE

WHAT TEXTRON LYCOMING PROMISES YOU

Textron Lycoming warrants each new reciprocating aircraft engine replacement part sold by it to be free from defectsin material and workmanship appearing within one (1) year from its date of firstoperation. The date of first opera-ion. must not exceed two (2) years from the date of shipment from Textron Lycoming.

Textron Lycoming's obligation under this warranty shall be limited to its choice of repair or replacement, on an ex-change basis. of the replacement part, when Textron Lycoming has determined that the part is defective in material orworkmanship. Textron Lycoming will also reimburse you for the costs for labor in connection with the repair or replace.ment as provided in Textron Lycoming's then current Removal and Installation Labor Allowance Guidebook.

Any part so repaired or replaced will be warranted for the remainder of the original warranty period.

YOUR OBLIGATIONS

The engine in which the replacement part is installed must have received normal use and service. You must apply forwaranty with an authorized Textron Lycoming distributor within 30 days of the appearance of the defect in material orworkmanship.

Textron Lycoming's warranty does not cover normal maintenance expenses or consumable items. The obligations onthe part of Textron Lycoming set forth above are your exclusive remedy and the exclusive liability of Textron Lycoming.This warranty allocates the risk of product failure between you and Textron Lycoming, as permitted by applicable law.

Textron Lycoming reserves the right to deny any warranty claim if it reasonably determines that the engine or part hasbeen subject to accident or used, adjusted, altered, handled, maintained or stored other than as directed in your operator'smanual, or if non-genuine Textron Lycoming parts are installed in or on the engine and are determined to be a possiblecause of the incident for which the warranty application is filed.

Textron Lycoming may change the construction of engines at any time without incurring any obligation to incorporatesuch alterations in engines or parts previously sold.

THIS LIMITED WARRANTY IS EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES AND REPRESEN-TATIONS.EXPRESS OR IMPLIED ORSTATUTORY.WHETHERWRITTEN ORORAL, INCLUDINGBUTNOTLIMITED TOANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.AND ANY IMPLIED WARRANTY ARISING FROM ANY COURSE OF PERFORMANCE OR DEALING ORTRADE USAGE. THIS WARRANTY IS ALSO IN LIEU OF ANY OTHER OBLIGATION, LIABILITY, RIGHT ORCLAIM. WHETHER IN CONTRACT OR IN TORT, INCLUDING ANY RIGHT IN STRICT LIABILITY INTORT OR ANY RIGHT ARISING FROM NEGLIGENCE ON THE PART OF TEXTRON LYCOMING, ANDTEXTRON LYCOMING'S LIABILITY ON SUCH CLAIM SHALL IN NO CASE EXCEED THE PRICE ALLO-CABLE TO THE ENGINE OR PART WHICH GIVES RISE TO THE CLAIM.

?K>0>

LIMITATION OF LIABILITY

IN NO EVENT, WHETHER AS A RESULT OFA BREACH OF WARRANTY, CONTRACT OR ALLEGED NEG-I LIGENCE, SHALL TEXTRON LYCOMING BE LIABLE FOR SPECIAL OR CONSEQUENTIAL OR ANY OTHERi DAMAGES, INCLUDING BUT NOT LIMITED TO LOSS OFPROFTS OR REVENUES, LOSS OF USE OFTHE

ENGINE OR COST OF A REPLACEMENT.

No agrement vaying this wamny or Textron Lyconing's obligations under it will be binding upon TextronLycinig unless n writing signed by a duly authorzed representative of Texron Lycoming.

Effective October 1, 1995 Revision 'J

Textron LycomingWilliamsport, Pennsylvania

4xX 3

i

i

Lycoming

WARRANTY(LIMITED)

OVERHAULEDRECIPROCATING AIRCRAFT ENGINE

WHAT TEXTRON LYCOMING PROMISES YOU

Textron Lycoming warrants each overhauled reciprocating engine sold by it to be free from defects in material andworkmanship appeanng within one (1) year from the date of first operation, excluding necessary aircraft acceptancetesting. The date of first operation must not exceed two (2) years from the date of shipment from Texton Lycoming.

Textron Lycoming's obligation under this waranty shall be limited to its choice of repair or replacement, on an ex-change basis, of the engine or any pan of the engine, when Textron Lycoming has determined that the engine is defectivein material or workmanship. Such repair or replacement will be made by Textron Lycoming at no charge to you. TextronLycoming will also bear the cost for labor in connection with the repair or replacement as provided in TextronLycoming's thencurrent Removal and Installation Labor Allowance Guidebook.

Any engine or part so repaired or replaced will be entitled to warranty for the remainder of the original warranty period.

YOUR OBLIGATIONS

The engine must have received normal ase and service. You must apply for warranty with an authorized TextronLycoming distributor within 30 days of the appearance of the defect in material or workmanship.

Textron Lycoming's warranty does not over normal maintenance expenses or consumable items. The obligations onthe part of Textron Lycoming set forth above are your exclusive remedy and the exclusive liability of Textron Lycoming.This warranty allocates the risk of product failure between you and Textron Lycoming, as permitted by applicable law.

Textron Lycoming reserves the right to deny any warranty claim if it reasonably determines that the engine or part hasbeen subject to accident or used, adjusted, altered, handled, maintained or stored other than as directed in your operator'smanual, or if non-genuine Textron Lycoming parts are installed in or on the engine and are determined to be a possiblecause of the incident for which the warranty application is filed.

Textron Lycoming may change the constuction of engines at any time without incurring any obligation to incorporatesuch alterations in engines or parts previously sold.

THIS LIMITED WARRANTY IS EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES AND REPRESEN-TATIONS, EXPRESS OR IMPLIED OR STATUTORY, WHETHER WRITTEN OR ORAL. INCLUDING BUT NOTLIMITED TO ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE,AND ANY IMPLIED WARRANTY ARISING FROM ANY COURSE OF PERFORMANCE OR DEALING ORTRADE USAGE THIS WARRANTY IS ALSO IN LIEU OF ANY OTHER OBLIGATION, LIABILITY, RIGHT ORCLAIM, WHETHER IN CONTRACT OR IN TORT, INCLUDING ANY RIGHT IN STRICT LIABILITY INTORT OR ANY RIGHT ARISING FRCM NEGLIGENCE ON THE PART OF TEXTRON LYCOMING, ANDTEXTRON LYCOMING'S LIABILITY ON SUCH CLAIM SHALL IN NO CASE EXCEED THE PRICE ALLO-CABLE TO THE ENGINE OR PART WHICH GIVES RISE TO THE CLAIM

(

i

4 4

LIMITATION OF LIABILITY

IN NO EVENT, WHETHER AS A RESULT OF A BREACH OF WARRANTY, CONTRACT OR ALLEGED NEG- LIGENCE, SHALL TEXTRON LYCOMING BE LIABLE FOR SPECIAL OR CONSEQUENTIAL OR ANY OTHER 4DAMAGES, INCLUDING BUTNOT LIMITED TOLOSS OFPROFITS OR REVENUES, LOSS OFUSE OFTHE 4ENGINE OR COST OF A REPLACEMENT.

No agreemen varying this waranty or Textron Lycoming's obligations under it will be binding upon Texston Lycoming unless in writing signed by a duly auhorized representative of Textron Lycoming.

4 4

Effective October 1, 1995 Revision 'J'

4\·~~~~~~~~~~~ ~~~~Textron Lycoming40·~~~~~~~~~~ ~~~~Williamsport, Pennsylvania

44

44

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AAVCO LYCOMING 76 SERIES OPERATOR’S MANUAL

TABLE OF CONTENTS

SECTION 1

SECTION 2

SECTION 3

SECTION 4

SECTION 5

SECTION 6

SECTION 7

SECTION 8

DESCRIPTION

SPECIFICATIONS

OPERATING INSTRUCTIONS

PERIODIC INSPECTIONS

MAINTENANCE PROCEDURES

TROUBLE--SHOOTING

INSTALLATION AND STORAGE

TABLES

Page

l-l

2-l

3-1

4-1

5-1

6-1

7-1

8-1

Left Side View - 0-360 (76 Series)

3/4 Right Rear View. 0-360 (76Series)

.:AVCO LYCOMING 76 SERIES OPERATOR'S MANUAL

DESCRIPTION

Page

General ............Cylinders ..........Valve Operating MechanismCrankcase .....Crankshaft ..........Connecting Rods ......Piston .....Oil Sump ...........Cooling System .......Induction System ......Lubrication System .....Priming System .......

. . . . . . . . . . . . . . . . . . .1-1

................... 1-1................... 1-1. . . . . . . . . . . . . . . . . . .1-2. . . . . . . . . . . . . . . . . . .1-2. . . . . . . . . . . . . . . . . . .1-2. . . . . . . . . . . . . . . . . . .1-2. . . . . . . . . . . . . . . . . . .1-2. . . . . . . . . . . . . . . . . . .1-2. . . . . . . . . . . . . . . . . . .1-2. . . . . . . . . . . . . . . . . . .1-3. . . . . . . . . . . . . . . . . . .1-3


0-360 SECTION 1

SECTION 1

DESCRIPTION

General - The Avco Lycoming 0-360 76 Series aircraft engine is a fourcylinder direct drive, horizontally opposed, wet sump, carbureted, aircooled engine.

In referring to the location of the various engine components, the partsare described in their relationship to the engine as installed in the air-frame. Thus, the power take-off end is considered the front and accessorydrive end the rear. The sump section is considered the bottom and theopposite side of the engine where the shroud tubes are located the top.References to the left and right side is made with the observer facing therear of the engine. The cylinders are numbered from the front to the rear,the 1 and 3 cylinders are on the right side, 2 and 4 cylinders are on theleft. The direction of rotation of the crankshaft is clockwise, viewed fromthe rear of the engine. The direction of rotation for the accessory drivesis determined with the observer facing the drive pad.

NOTE

The letter "L" in the model prefix denotes the reverse rotation of thebasic model Example: 0360-E1AD has clockwise rotation of thecrankshaft, therefore the LO-360-E1AD has a counterclockwise rotation.Likewise the rotation of the accessory drives of the LO360-ElAD are op-posite those of the basic model.

The letter "D" used as the 4th and 5th character in the model suffixdenotes that the engine is equipped with a dual magneto housed in asingle housing.

Operational aspects of engines are the same and performance data andspecifications for the basic models will apply.

Revised November, 1980 1-1

.dAVCO LYCOMING 76 SERIES OPERATOR'S MANUAL

SECTION 1 0-360

Cylinders - The cylinders are of conventional air cooled constructionswith two major parts, head and barrel, screwed and shrunk together. Theheads are made from an aluminum alloy casting with a fully machinedcombustion chamber. The rocker box is cast as an integral part of thecylinder head which forms the housing for both intake and exhaust valverockers. The cylinder barrels, which are machined from chrome nickelmolybdenmum steel forgings, have deep integral cooling fins and the in-side of the barrels are ground and honed to a specified finish.

Valve Operating Mechanism - A conventional type camshaft is locatedabove and parallel to the crankshaft. The camshaft acutuates thehydraulic tappets which operate the valves through push rods and valverockers. Valve rockers are held in place by the use of rocker arm fulcrum.The valve springs bear against hardened steel seats and are retained onthe valve stems by means of split keys.

Crankcase - The crankcase assembly consists of two reinforcedaluminum alloy castings with the accessory housing as an integral part,fastened together by means of studs, bolts and nuts. The mating sur-faces of the two castings are jointed without the use of gaskets and themain bearing bores are machined for the use of precision type main bear-ing inserts.

Crankshaft - The crankshaft is made from a chrome nickel molybdenumsteel forging. All bearing journal surfaces are nitride hardened. Freedomfrom torsional vibration is assured by a system of pendulum typedynamic counterweights.

Connecting Rods - The connecting rods are made in the form of "H" sec-tion from alloy steel forgings. They have replaceable bearing inserts inthe crankshaft ends and bronze bushings in the piston ends. The bearingcaps on the crankshaft ends are retained by two bolts and nuts througheach cap.

Pistons - The pistons are machined from an aluminum alloy. The pistonpin is of the floating type with a plug located at each end of the pin. Thepistons employ half wedge rings. Consult the latest edition of Service In-struction No. 1037 for proper piston and ring combinations.

Oil Sump - The sump incorporates an oil drain plug, oil suction screen,mounting pad for the carburetor, the intake riser and the intake pipe con-nections.

Revised November, 1980


0-360 SECTION 1

Cooling System - The engine is designed to be air cooled by air pressure.Baffles are provided to build up a pressure and direct the air through thecylinder fins. The air is then exhausted to the atmosphere through therear of the lower cowling.

Induction System - The engine is equipped with a Marvel-Schebler typeHA-6 horizontal carburetor, equipped with a manual mixture controland idle cut-off. Distribution of the fuel-air mixture is obtained throughthe center zone induction system, which is integral with the oil sump andis submerged in oil, insuring a more uniform vaporization of the fuel andaiding in cooling the oil in the sump. From the riser the fuel-air mixtureis distributed to each cylinder by individual intake pipes.

Lubrication System - The lubrication system is of the pressure wetsump type. The oil pump located on the exterior of the crankcase ac-cessory section, draws oil through a drilled passage leading from the oilsuction screen located in the sump. The oil from the pump then enters adrilled passage in the accessory section to the oil pressure screen hous-ing where a flexible line leads the oil to the external oil cooler. In theevent that cold oil or an obstruction should restrict the flow of oil to thecooler, an oil cooler bypass valve is provided. Pressure oil from the coolerreturns to a second connection in the oil pressure screen housing fromwhich point a drilled passage conducts the oil to the oil pressure reliefvalve, located at the bottom of the accessory section.

The pressure relief valve regulates the engine oil pressure by allowingthe excessive oil to return to the sump, while the balance of the pressureoil is fed to the main oil gallery. The oil is distributed by means of aseparate drilled passage to the main bearings of the crankshaft. Angularholes are drilled through the main bearing to the connecting rod jour-nals. Oil from the main oil gallery also flows to the camshaft and valvegear passages and is then conducted through branch passages to thehydraulic tappets and camshaft bearing. Oil enters the tappets throughindexing holes and travels out through the hollow push rod tubes to thevalve mechanism, lubricating the valve rocker and valve stems. Residualoil from the bearings, accessory drives and rocker boxes is returned bygravity to the sump where after passing through a screen it is again cir-culated through the engine. Pressure build up within the crankcase isheld to a minimum by means of a breather located on the top rear of thecrankcase.

Priming System - Provision for a primer system is provided on allengines employing a carburetor.


AAVCO LYCOMING 76 SERIES OPERATOR’S MANUAL

SPECIFICATION

Page

0-360-E . .2-l Standard l%,i,, hbi&t’ : : : : : : : : : : : : : : : : : : : . .2-l Accessory Drive

Drive Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . .2-l Direction of Rotation . . . . . . . . . . . . . . . . . . . . .2-l


0-360 SECTION 2

SECTION 2

SPECIFICATIONS

0-360-E

FAA Type Certificate ... ... . ... ...... ....... .286Rated horsepower .......... .............................. 180Rated speed, RPM ... . ..... .. . ................... 2700Bore, inches .................. ................. 5.125Stroke, inches ......... .......... ............... 4.375Displacement, cubic inches .. . .. ....... . .............. 361.0Compression ratio ............ ...... ................ 9.0:1Firing order ..................... .. .. .. ......... 1-3-2-4Spark occurs, degrees BTC ......... .................. 250Valve rocker clearance (hydraulic tappets collapsed) .......... 028-.080Propeller drive ratio ................................... 1:1Propeller driven rotation (viewed from rear) . ......... ... Clockwise

Standard Dry Weight0-360-ElAD, -E2AD, -E1BD, -E2BD. . ............. 293 lbs.

*Accessory Drive

StarterAlternatorTachometer DriveMagnetoAN Vacuum Pump DrivePropeller Gov. AN-20010Dual Drive

Vac. Pump & Hyd. Pump

Drive Ratio **Direction of Rotation

16.550:13.250:10.500:11.000:11.313:11.000:1

1.313:1

Counter-ClockwiseClockwiseClockwiseClockwise

Counter-ClockwiseClockwise

Counter-Clockwise

* - When applicable.** - Viewed facing drive pad. - Note that engines with "L" in prefix willhave opposite rotation to the above.


I 7AVCO LYCOMING 76 SERIES OPERATOR'S MANUAL

OPERATING CONDITIONS

Page

General .......Prestarting Items of MaintenanceStarting Procedures ........Ground Running and Warm Up Ground Check ...........Operation in Flight

Leaning Procedure .......Use of Intake Air Heat ControlEngine Flight Chart.......

Engine Shut-Down Procedure . .Performance Curves .......

. . . . . . . . . . . . . . . 3-1

. . . . . . . . . . . . . . .. 3-1

............... .3-2

. . . . . . . . . . . . . . . 3-3

. . . . . . . . . . . . . . . .3-3

. . . . . . . . . . . . . . . .3 -4

. . . . . . . . . . . . . . . .3-6

.............. . 3-10

. . . . . . . . . . . . . . .3-11.............. .3-12


0-360 SECTION 3

SECTION 3

OPERATING INSTRUCTIONS

1. GENERAL. Close adherence to these instructions will greatlycontribute to long life, economy and satisfactory operation of the engine.

NOTE

YOUR ATTENTION IS DIRECTED TO THE WARRANTIES THATAPPEAR IN THE FRONT OF THIS MANUAL REGARDING ENGINESPEED, THE USE OF SPECIFIED FUELS AND LUBRICANTS,REPAIRS AND ALTERATIONS. PERHAPS NO OTHER ASPECT OFENGINE OPERATION AND MAINTENANCE CONTRIBUTES QUITESO MUCH TO SATISFACTORY PERFORMANCE AND LONG LIFE ASTHE CONSTANT USE OF CORRECT GRADES OF FUEL AND OIL,CORRECT ENGINE TIMING, AND FLYING THE AIRCRAFT ATALLTIMES WITHIN THE SPEED AND POWER RANGE SPECIFIED FORTHE ENGINE. DO NOT FORGET THAT VIOLATION OF THEOPERATION AND MAINTENANCE SPECIFICATIONS FOR YOURENGINE WILL NOT ONLY VOID YOUR WARRANTY BUT WILLSHORTEN THE LIFE OF YOUR ENGINE AFTER ITS WARRANTYPERIOD HAS PASSED.

New engines have been carefully run-in by Avco Lycoming andtherefore, no further break-in is necessary insofar as operation isconcerned; however new or newly overhauled engines should avoid lowpower below 65%, during the first 50 hours or until the oil consumptionhas stabilized. The engine should also be operated on straight mineral oilfor a minimum of 50 hours or until the oil consumptionhas stabilized.After this period a change to an approved additive oil Spec. MIL-L-6082 orAshless Dispersant MIL-L-22851 may be made, if so desired.

NOTE

Cruising should be done at 65% to 75% power until a total of 50 hours hasaccumulated or oil consumption has stabilized. This is to ensure properseating of the rings and is applicable to new engines, and engines in servicefollowing cylinder replacement or top overhaul of' one or more cylinders.

The minimum fuel octane rating is listed in the flight chart, Part 9, ofthis section. Under no circumstances should fuel of alower octane ratingor automotive fuel (regardless of octane rating) be used.

2. PRESTARTING ITEMS OF MAINTENANCE. Before starting theaircraft engine for the first flight of the day, there are several items ofmaintenance inspection that should be performed. These are described inSection 4 under Daily Pre-Flight Inspection. They must be observed beforethe engine is started.

3-1


SECTION 3 0-360

3. STARTING PROCEDURES.

The following starting procedures are recommended; however, thestarting characteristics of various installations will necessitate somevariation from these procedures.

NOTE

Cranking periods must be limited to ten (10) to twelve (12) seconds with afive (5) minute rest between cranking periods.

a. Carbureted Engines (Cold).

( ) Perform pre-flight inspection.

(2) Set carburetor heat control in "off" position.

(3) Set propeller governor control in "Full RPM" position (whereapplicable).

(4) Turn fuel valves "On".

(5) Move mixture control to "Full Rich".

(6) Turn boost pump on (where applicable).

(7) Open throttle approximately 1/4 travel.

(8) Prime with 1 to 3 strokes of manual priming pump or activateelectric primer for 1 or 2 seconds.

(9) Set magneto selector switch (Consult airframe manufacturer'shandbook for correct position).

(10) Engage starter.

(11) When engine fires move the magneto switch to "Both".

(12) Check oil pressure gage. If minimum oil pressure is notindicated within thirty seconds, stop engine and determine trouble.

NOTE

If engine fails to achieve a normal start, assume it to be flooded and usestandard clearing procedure, then repeat above steps.

b. Carburetor Engine (Hot) - Proceed as outlined above, omitting thepriming step.

3-2


0360 SECTION 3

4. COLD WEATHER STARTING. During the extreme cold weather, itmay be necessary to preheat the engine and oil before starting.

5. GROUND RUNNING AND WARM-UP.

The engines covered in this manual are air-pressure cooled and dependon the forward speed of the aircraft to maintain proper cooling. Par-ticular care is necessary, therefore, when operating these engines on theground. To prevent overheating, it is recommended that the followingprecautions be observed.

NOTE

Any ground check that requires full throttle operation must be limited tothree minutes, or less if the indicated cylinder head temperatures shouldexceed the maximum stated in this manual

a. Head the aircraft into the wind.

b. Leave mixture in "Full Rich".

c. Operate only with the propeller in minimum blade angle setting(where applicable).

d. Warm up at approximately 1000 - 1200 RPM. Avoid prolonged idl-ing and do not exceed 2200 RPM on the ground.

e. Engine is warm enough for take-off when the throttle can be openedwithout the engine faltering.

6. GROUND CHECK.

a. Warm-up as directed above.

b. Check both oil pressure and oil temperature.

c. Leave mixture in "Full Rich".

d. (Where applicable) Move the propeller control through its completerange to check operation and return it to full low pitch position. Fullfeathering check (twin engine) on the ground is not recommended butthe feathering action can be checked by running the engine between1000 - 1500 RPM; then momentarily pulling the propeller control intothe feathering position. Do not allow the RPM to drop more than 500RPM.


4AVCO LYCOMING 76 SERIES OPERATOR'S MANUAL-

SECTION 3 0860

e. A proper magneto check is important. Additional factors, other thanthe ignition system, affect magneto drop-off. They are load-power out-put, propeller pitch and mixture strength. The important thing is thatthe engines run smoothly because magneto drop-off is affected by thevariables listed above. Make the magneto check in accordance with thefollowing procedures.

(1) (Controllable Pitch Propeller) - With propeller in minimum pitchangle, set the engine to produce 50 - 65% power as indicated by themanifold pressure gage. Mixture control should be in the full richposition. At these settings, the ignition system and spark plugsmust work harder because of the greater pressure within thecylinders. Under these conditions ignition problems, if they exist,will occur. Magneto checks at low power settings will only indicatefuel-air distribution quality.

NOTE

Aircraft that are equipped with fixed pitch propellers, or not equippedwith manifold pressure gage, may check magneto drop-off with engineoperating at a minimum of 2000/2100 RPM.

(2) Switch from both magnetos to one and note drop-off, return toboth until engine regains speed and switch to the other magneto andnote drop-off, then return to both. Drop-off should not exceed 175RPM and should not exceed 50 RPM between magnetos. A smoothdrop-off past normal is usually a sign of a too lean or too rich mix-ture.

f. Do not operate on a single magneto for too long a period, a fewseconds is usually sufficient to check drop-off and will minimize thepossibility of plug fouling.

7. OPERATION IN FLIGHT.

See airframe manufacturer's instructions for recommended power set-tings.

a. Fuel Mixture Leaning Procedure.

Improper fuel/air mixture during flight is responsible for manyengine problems, particularly during take-off and climb power set-tings. The procedures described in this manual provide proper fuel/air

3-4 Revised November, 1980


0-360 SECTION 3

mixture when leaning Avco Lycoming engines; they have proven to beboth economical and practical by eliminating excessive fuel consump-tion and reducing damaged parts replacement. It is therefore recom-mended that operators, of all Avco Lycoming aircraft power-plants,utilize the instructions in this publication any time the fuel/air mix-ture is adjusted during flight.

Manual leaning may be monitored by exhaust gas temperature in-dication, fuel flow indication, and by observation of engine speedand/or airspeed. However, whatever instruments are used in monitor-ing the mixture, the following general rules should be observed by theoperator of Avco Lycoming aircraft engines.

GENERAL RULES

Never exceed the maximum red line cylinder head temperature of500°F. (260°C.)

For maximum service life, cylinder head temperatures should be main-tained below 435°F. (224°C.) during high performance cruise operationand below 400°F. (205°C.) for economy cruise powers.

Never lean the mixture from full rich during take-off, climb or high per-formance cruise operation unless the airplane owners manual advisesotherwise. However, during take-off from high elevation airports or dur-ing climb at higher altitudes, roughness or reduction of power may occurat full rich mixture. In such a case the mixture may be adjusted onlyenough to obtain smooth engine operation. Careful observation oftemperature instruments should be practiced

Operate the engine at maximum power mixture for performance cruisepowers and at best economy mixture for economy cruise power; unlessotherwise specified in the airplane owners manual

Always return the mixture to full rich before increasing power set-tings.

During let-down and reduced power flight operations it may benecessary to manually lean or leave mixture setting at cruise positionprior to landing. During the landing sequence the mixture control shouldthen be placed in the full rich position, unless landing at high elevationfields where leaning may be necessary.


zIAVCO LYCOMING 76 SERIES OPERATOR'S MANUAL

SECTION 3 0-360a. LEANING WITH EXHAUST GAS TEMPERATURE GAGE.

(I) Maximum Power Cruise (approximately 75% power) - It ispermissible to lean to 100o-1500F. on rich side of peak EGT unlessaircraft operator's manual shows otherwise. Monitor cylinder headtemperatures.

(2) Best Economy Cruise (approximately 75% power and below) -Operate at peak EGT.

b. LEANING WITH FLOWMETER.

Lean to applicable fuel-flow tables or lean to indicator marked forcorrect fuel-flow for each power setting.

c. LEANING WITH MANUAL MIXTURE CONTROL (EconomyCruise, 75% power or less) without flowmeter or EGT gage).

(1) Slowly move mixture control from "Full Rich" position towardlean position.

(2) Continue leaning until engine roughness is noted.

(3) Enrich until engine runs smoothly and power is regained.

As shown in Figure 3-1, if engine speed and throttle setting are keptconstant at normal cruise conditions, the effect of leaning on engine powerand engine temperatures will be as shown. Power drops rapidly when theengine is leaned beyond peak exhaust gas temperature; also, best power isattained at 100°-150°F. on the rich side of peak exhaust gas temperature.

8. USE OF INTAKE AIR HEAT CONTROL. Under certain moistatmospheric conditions when the relative humidity is more than 50% andat temperature of 20° to 90° , it is possible for ice to form in the inductionsystem, even in summer weather. This is due to the high air velocitythrough the venturi and the absorption of heat from this air byvaporization of the fuel. The temperature in the mixture chamber maydrop as much as 70°F. below the temperature of the incoming air. If thisair contains a large amount of moisture, the cooling process can causeprecipitation in the form of ice. Ice formation generally begins in thevicinity of the butterfly and may build up to such an extent that a drop inpower output could result. A loss of power is reflected by a drop inmanifold pressure in installations equipped with constant speed propellerand a drop in manifold pressure and RPM in installations equipped withfixed pitch propellers. If not corrected, this condition may cause completeengine stoppage.

3-6

0-360 SECTI

BEST MAX.EONOMY POWERRANGE RANGE

30 100 E

90

85

TOO BEST MAX. FULL RICHLEAN ECONOMY POWER TAKE OFF

CRUISE CRUISE

LEAN MIXTURE RICH —

Figure 3-1. Representative Effect of Leaning on Cylinder HeadTemperature, EGT (Exhaust Gas Temperature), Engine Powerand Specific Fuel Consumption at Constant Engine RPM and

Manifold Pressure


N 3

3-7


SECTION 3 0-360

To avoid this, all installations are equipped with a system forpreheating the incoming air supply to the carburetor. In this way suffi-cient heat is added to replace the heat loss of vaporization of fuel,preventing the mixing chamber temperature from dropping to the freez-ing point of water. This air preheater is essentially a tube or jacketthrough which the exhaust pipe from one or more cylinders is passed,and the air flowing over these surfaces is raised to the requiredtemperatures before entering the carburetor. Consistently hightemperatures can cause a loss of power and a decided variation of mix-ture. The following outline is the proper method of utilizing the car-buretor air heat control.

a. Ground Operation - Use of the carburetor air heat on the groundshould be held to a minimum. On some installations the air does notpass through the air filter, and dirt and foreign substances can betaken into the engine with the resultant cylinder and piston ring wear.In dirt and dust free areas carburetor air heat should be used on theground to make certain it is functioning properly.

b. Take-Off - Take-offs and full throttle operation should be made withthe carburetor heat control in full cold position.

c. Climbing - When climbing at part throttle power settings of 80% orabove, the carburetor heat control should be set in the full cold posi-tion; however, if it is necessary to use heat to prevent icing it is possi-ble for engine roughness to occur due to the over-rich fuel-air mixtureproduced by the additional heat. When this happens, carefully lean themixture with the mixture control only enough to produce smoothengine operation. Do not continue to use carburetor air heat afterflight is out of icing conditions, and adjust mixture according to per-cent of power and alititude.

d Flight Operation - During normal flight, leave the carburetor airheat control in the cold position. On damp, cloudy, foggy or hazy days,regardless of the outside air temperatures, look out for loss of power.This will be evidenced by an unaccountable loss in manifold pressureor RPM or both, depending on whether a constant speed or fixed pitchpropeller is installed on the aircraft. If this happens, apply full car-buretor air heat and increase the throttle, if available to compensatefor power loss. This will result in a slight additional drop in manifoldpressure which is normal, and this drop will be regained as the ice ismelted out of the induction system. When ice has been melted from theinduction system, heat should be used as long as known or suspectedicing exists. Only in those aircraft equipped with an induction systemair temperature gage may partial heat be used to keep the mixturetemperature above freezing point (32°F.). Be alert to the threat of car-buretor icing during reduced power operation over water.



0-360 SECTION 3

WARNING

It is advisable, to use either full heat or no heat in aircraft that are notequipped with an induction air temperature gage. At an ambienttemperature of 14°F. (-9.99°C.) or below any mixture in the air is frozenand heat is not required.

e. Landing Approach - In making a landing approach, the carburetor airheat should usually be in the "Full Cold" position. However, if icingconditions are known or suspected, the "Full Heat" should be applied.In the case that full power need be applied under these conditions, asfor an aborted landing, the heat should be returned to "Full Cold"prior to full power application. See the aircraft flight manual forspecific instructions. As a safety measure, there is no objection to theuse of heat during landing approach provided that on a go-around, ortouch-and-go landing, the heat is returned promptly to the coldposition prior to application of the throttle.

3-9


SECTION 3 0-3609. ENGINE FLIGHT CHART.

a. Fuel *Aviation Grade Fuel0-360-E ........................ 100/130 octane min.

* - Refer to the latest edition of Service Instruction No. 1070.

NOTE

Aviation grade 100LL fuels in which the lead content is limited to 2 c. c.per gallon are approved for continuous use in the above engines.

b. Fuel PressureO-360-E

Inlet to carburetor

Max.

8.0

Desired Min.

3.0 0.5

Gal. Per Hour. .. .. .. . .. . 14.9........... 10.8........... .8.8

c. Fuel ConsumptionNormal Rated (2700 RPM, 180 HP) .......75% Rated (2400 RPM, 135 HP) .........65% Rated (2350 RPM, 117 HP) .........

c. Lubrication Oil -

*Recommended Grade Oil

AverageAmbient Air

Above 60 F. (15.55°C.)300 (-1.11 C.) to 90 F. (32.22 0 C.)

00 (-17.77 0C.) to 70 0 F. (21.11 0C.)Below 10 F. (-12.22 0C.)

MIL-L-22851MIL-L-6082 Ashless Dispersant

Grades Grades

SAE 50SAE 40SAE 30SAE 20

SAE 40 or SAE 50SAE 40

SAE 40 or SAE 30SAE 30

* - See the latest edition of Service Instruction No. 1014 for completelubrication oil recommendations.

Average *Oil Inlet TemperatureAmbient Air Desired Maximum

Above 60 0 F. (15.55 0C.)300 (-1.1] OC.) to 90 0 F. (32.22 0 C.)00 (-17.77 0C.) to 70 0 F. (21.11 0 C.)

Below 10 F. (-12.22 0 C.)

180 0 F. ( 82 0C.)180 0 F. ( 82 0C.)1700 F. ( 77 0C.)1600 F. ( 710C.)

245 0 F. (118 0C.)245 0 F. (118 0C.)225 0 F.(107 0C.)210 0 F. ( 990 C.)

* - Engine oil temperature should not be below 140 0 F. (60 0C.) duringcontinuous operation.


0-360 SECTION 3

e. Oil Sump Quantities -0-360-E

Minimum Safe Quantity in Sump ................ 2 Qts. (U.S.)Maximum Sump Capacity... ................... 6 Qts. (U.S.)

f. Oil Pressure, psi Max. Min.** Idling

Normal Operation 90 60 15Starting and Warm-Up 115

* - See Section 5 Page 5-7 for oil pressure relief valve adjustment.

Max. Oil Cons.g. Oil Consumption Qts. Per Hour0-360-ENormal Rated (2700 RPM, 180 HP) ........................... 8075% Rated (2450 RPM, 135 HP) ........................... 4565% Rated (2350 RPM, 117 HP) ............................ 39

h. Cylinder Head TemperatureMaximum Permissible.......................500°F. (260°C.)

NOTE

Cylinder head temperature taken at the bayonet location, for maximumservice life of the engine, maintain cylinder head temperatures between150°F. (66 C.) and 400°F. (205°C.) during continuous operation.

10. ENGINE SHUT-DOWN.

a. Set propeller at minimum blade angle (where applicable).

b. Idle until there is a decided decrease in cylinder head temperature.

c. Move mixture control to the idle cut-off position.

d. When engine stops, turn ignition switch to off position.


Figure 3-3. Sea Level and Altitude Performance -0-360-E

z7AVCO LYCOMING 76 SERIES OPERATOR'S MANUAL

PERIODIC INSPECTION

Page

General .....Pre-Starting Inspection . .Daily Pre-Flight ......25 Hour Inspection ....50 Hour Inspection ....100 Hour Inspection . . .400 Hour Inspection . . .Non-Scheduled Inspection

.................... 4-1

.................... 4-1.................... 4-2............. ...... 4-2.................... .4-2................... .4-4................... .4-5.................... 4-5


0-360 SECTION 4

SECTION 4

PERIODIC INSPECTIONS

NOTE

Perhaps no other factor is quite so important to safety and durability ofthe aircraft and its components as faithful and diligent attention to regularchecks for minor troubles and prompt repairs when they are found.

The operator should bear in mind that the items listed in the followingpages do not constitute a complete aircraft inspection, but are meant forengine only. Consult the airframe manufacturer's handbook for additionalinstructions.

Pre-Starting Inspection - The daily pre-flight inspection is a check of theaircraft prior to the first flight of the day. This inspection is to determinethe general condition of the aircraft and engine.

The importance of proper pre-flight inspection cannot be overemphasized. Statistics prove several hundred accidents occur yearlydirectly responsible to poor pre-flight inspections.

Among the major causes of poor pre-flight inspection are lack ofconcentration, reluctance to acknowledge the need for a check list,carelessness bred by familiarity and haste.

4-1


SECTION 4 0-360

1. DAILY PRE-FLIGHT.

a. Be sure all siwtches are in the "off" position.

b. Be sure magneto ground wires are properly connected.

c. Check oil level.

d. See that fuel tanks are full.

e. Check fuel and oil line connections, note any minor indications forrepair at 50 hour inspection. Repair any leaks before the aircraft isflown.

f. Open the fuel drain to remove any accumulation of water andsediment.

g. Make sure all shields and cowling are in place and secure. If any aremissing or damaged, repair or replacement should be made before theaircraft is flown.

h. Check all controls for general condition, travel and freedom ofoperation.

i. Inspect the induction system air filter and service in accordance withthe airframe manufacturer's recommendations.

2. 25 HOUR INSPECTION. After the first twenty-five hours operatingtime; new, remanufactured or newly overhauled engines should undergo a50 hour inspection, including draining and renewing the lubricating oil.

3. 50 HOUR INSPECTION. In addition to the items listed for dailypre-flight inspection, the following maintenance checks should be madeafter every 50 hours of operation.

a. Ignition System -

(1) If fouling of spark plugs has been apparent, rotate bottom plugsto top position.

4-2


0-360 SECTION 4

(2) Examine spark plug leads of cable and ceramics for corrosion anddeposits. This condition is evidence of either leaking spark plugs,improper cleaning of the spark plug walls or connector ends. Wherethis condition is found, clean the cable ends, spark plug walls andceramics with a dry, clean cloth or a clean cloth moistened withmethyl-ethyl ketone. All parts should be clean and dry beforereassembly.

(3) Check ignition harness for security of mounting clamps and besure connections are tight at spark plug and magneto terminals.

b. Fuel and Induction System - Check the primer lines for leaks andsecurity of the clamps. Remove and clean the fuel inlet strainers. Checkthe mixture control and throttle linkage for travel, freedom ofmovement, security of the clamps and lubricate if necessary. Check theair intake ducts for leaks, security, filter damage; evidence of dust orother solid material in the ducts is indicative of inadequate filter care ordamaged filter. Check vent lines for evidence of fuel or oil seepage; ifpresent, fuel pump may require replacement.

c. Lubrication System -

(1) Remove oil suction screen and check carefully for presence ofmetal particles that are indicative of internal engine damage. Thisstep is not feasible unless oil is being changed and should be omittedon installations employing an external full flow oil filter.

(2) Replace external full flow oil filter element. Examine the filterelement for metal particles or carbon contamination. Drain andrenew lubricating oil on installations not employing external fullflow oil filter.

NOTE

Intervals between oil changes can be increased as much as 100% on enginesequipped with full flow oil filters - provided the element is replaced each50 hours of operation. However, the use of high lead content fuel, theoperation in dusty areas, cold climates, and where short flight and longidle periods are encountered, more frequent oil changes may be necessary.

4-3


SECTION 4 0-360

(3) Check oil lines for leaks, particularly at connections and forsecurity at clamp location. Also check for wear due to rubbing orvibration, for dents and cracks.

d. Exhaust System - Check attaching flanges at exhaust ports oncylinder for evidence of leakage. If they are loose, they must beremoved and machined flat before they are reassembled and tightened.Examine exhaust manifolds, muffler, and pipes, leakage and looseconnection. Repair or replace as necessary.

e. Cooling System - Check cowling and baffles for damage and secureanchorage. Any damaged or missing part of the cooling system must berepaired or replaced before the aircraft resumes operation.

f. Cylinders - Check rocker box covers for evidence of oil leaks. Iffound, replace gasket and tighten screws to specified torque (50 inchlbs.).

Check cylinders for evidence of excessive heat which is indicated byburned paint on the cylinder. This condition is indicative of internaldamage to the cylinder and, if found, its cause must be determined andcorrected before the aircraft resumes operation.

Heavy discoloration and appearance of seepage at cylinder head andbarrel attachment area is usually due to emission of thread lubricantused during assembly of the barrel at the factory, or by slight gasleakage which stops after the cylinder has been in service for awhile.This condition is neither harmful nor detrimental to engineperformance and operation. If it can be proven that leakage exceedsthese conditions, the cylinder should be replaced. However, if theseepage or gas leakage continues it will be necessary to replace thecylinder and head assembly.

4. 100 HOUR INSPECTION. In addition to the items listed for dailypre-flight and 50 hour inspection, the following maintenance checksshould be made after every one hundred hours of operation.

a. Electrical System -

(1) Check all wiring connected to the engine or accessories. Anyshielded cables that are damaged should be replaced. Replace clampsor loose wires and check terminals for security and cleanliness.

(2) Remove spark plugs; test, clean and regap. Replace if necessary.

4-4


0-360 SECTION 4

b. Magnetos - Check breaker points for pitting and minimum gap.Check for excessive oil in the breaker compartment, if found, wipe drywith a clean lint free cloth. The felt located at the breaker pointsshould be lubricated in accordance with the magneto manufacturer'sinstructions. Check magneto to engine timing. Timing procedure isdescribed in Section 5, 1, b of this manual.

c. Engine Accessories - Engine mounted accessories such as pumps,temperature and pressure sensing units should be checked for securemounting, tight connections.

d. Cylinders - Check cylinders visually for cracked or broken fins.

e. Engine Mounts - Check the engine mounting bolts and bushings forsecurity and excessive wear. Replace any bushings that are excessivelyworn.

5. 400 HOUR INSPECTION. In addition to the items listed for dailypre-flight, 50 hour and 100 hour inspections, the following maintenancecheck should be made after every 400 hours of operation.

Valve Inspection - Remove rocker box covers and check for freedom ofvalve rockers when valves are closed. Look for evidence for abnormal wearor broken parts in the area of the valve tips, valve keeper, springs andspring seats. If any indications are found, the cylinder and all of itscomponents should be removed (including the piston and connecting rodassembly) and inspected for further damage. Replace any parts that do notconform with limits shown in the latest edition of Special ServicePublication No. SSP2070.

6. NON-SCHEDULED INSPECTIONS. Occasionally, service bulletins orservice instructions are issued by Avco Lycoming Division that requireinspection procedures that are not listed in this manual. Such publications,usually are limited to specified engine models and become obsolete aftercorrective modification has been accomplished. All such publications areavailable from Avco Lycoming distributors, or from the factory bysubscription. Consult the latest edition of Service Letter No. L114 forsubscription information. Maintenance facilities should have an up-to-datefile of these publications available at all times.

4-5

LAVCO LYCOMING 76 SERIES OPERATOR'S MANUAL


Page

General .. . . .............Ignition and Electrical System

Ignition Harness and Wire ReplacementTiming Magneto to Engine ........Internal Timing - Dual Magneto .....Alternator Output ............

Fuel SystemRepair of Fuel Leaks ...........Carburetor Fuel Inlet Screen ......Fuel Grades and Limitations ......Air Intake Ducts and Filter .......Idle Speed and Mixture Adjustment . .

Lubrication SystemOil Grade and Limitations ........Oil Suction and Oil Pressure Screens . .Oil Relief Valve Adjustment .......

Cylinder .. . ... ... . .....Alternator Drive Belt Tension .......

.......... .5-1

.......... .5-1

.......... .5-1

.......... .5-3

.......... .5-5

.......... .5-5

.......... .5-6

........... 5-6

........... 5-6

.......... .5-6

.......... .5-7

.......... .5-7

.......... .5-7

.......... .5-8

......... .5-12


0-360 SECTION 5

SECTION 5


The procedures described in this section are provided to guide andinstruct personnel in performing such maintenance operations that may berequired in conjunction with the periodic inspections listed in thepreceding section. No attempt is made to include repair and replacementoperations that will be found in the applicable Avco Lycoming OverhaulManual.

1. IGNITION AND ELECTRICAL SYSTEM.

a. Ignition Harness and Wire Replacement - In the event that an ignitionharness or an individual lead is to be replaced, consult the wiringdiagram to be sure harness is correctly installed. Mark location ofclamps and clips to be certain the replacement is clamped at correctlocations.

b. Timing Magnetos to Engine -

(1) Remove a spark plug from No. 1 cylinder and place a thumb overthe spark plug hole. Rotate the crankshaft in direction of normalrotation until the compression stroke is reached, this is indicated bya positive pressure inside the cylinder tending to push the thumb offthe spark plug hole. Continue rotating the crankshaft until theadvance timing mark on the front face of the starter ring gear is inalignment with the small hole located at the two o'clock position onthe front face of the starter housing. (Ring gear may be marked at20° and 25° . Consult specifications for correct timing mark for yourinstallation.) At this point, the engine is ready for assembly of themagneto.

c. Dual Magneto -

(1) Place the engine in the No. 1 firing position as directed inparagraph lb(l).

(2) Install the magneto-to-engine gasket on the magneto flange.

5-1


SECTION 5 0-360

WARNING

Do not attach harness spark plug ends to the spark plugs until allmagneto-to-engine timing procedures and magneto-to-switch connectionsare entirely completed.

(3) Remove engine-to-magneto drive gear train backlash by turningengine magneto drive in direction opposite to normal rotation andreturn to timing mark on the starter support in direction of normalrotation.

(4) Remove the timing window plug from the most convenient sideof the magneto housing and the plug from the rotor viewing locationin the center of the housing.

(5) Turn the rotating magnet drive shaft in the normal direction ofmagneto rotation until the painted tooth of the large distributor gearis centered in the timing hole.

(6) Observe that at this time the built in pointer just ahead of therotor viewing window aligns with the R or L mark on the rotordepending on whether the magneto is of right or left hand rotationas specified on the magneto nameplate.

(7) Hold the magneto in its No. 1 firing position (tooth in windowcenter and pointer over R or L mark on rotor) and install magnetoto the engine and loosely clamp in position.

(8) Attach red lead from the timing light to left switch adapter lead,green lead of timing light to right switch adapter lead and the blacklead of the light to magneto housing.

(9) Turn the entire magneto in direction of rotor rotation until thered timing light comes on.

(10) Rotate the magneto in the opposite direction until the red lightjust goes off indicating left main breaker has opened. Then evenlytighten the magneto mounting clamps.

(11) Back the engine up approximately 10 ° and then carefully"bump" the crankshaft in direction of rotation, at the same timeobserving the timing lights.

0-360 SECTION 5(12) At the No. 1 firing position of the engine, the red light shouldgo off indicating left main breaker opening. The right main breakermonitored by the green light, must open within 2 engine degrees ofthe No. 1 firing position.

(13) Repeat steps (9) thru (11) until the condition described inparagraph (12) is obtained.

(14) Complete tightening of the magneto securing clamps bytorqueing to 150 inch pounds.

(15) Recheck timing once more and if satisfactory disconnect timinglight. Remove adapter leads.

(16) Reinstall plugs in timing inspection holes and torque 12 - 15 in.

(17) Install the harness leads as shown in figure 5-1 to spark plug andconnect switch lead to proper terminal.

NOTE

Some timing lights operate in the reverse manner as described. The lightcomes on when the breaker points open. Check your timing lightinstructions.

d. Internal Timing - Dual Magneto - Check the magneto internal timingand breaker synchronization in the following manner.

(1) Main Breakers - Connect the timing light negative lead to anyunpainted surface of the magneto. Connect one positive lead to theleft main breaker terminal and the second positive lead to the rightmain breaker terminal.

(2) Back the engine up a few degrees and again bump forwardtoward number one cylinder firing position while observing timinglights. Both lights should go out to indicate opening of the mainbreakers, when the timing pointer is indicating within the width ofthe "L" or "R" mark. If breaker timing is incorrect, loosen breakerscrews and correct. Retorque breaker screws to 20 to 25 in. lbs.

(3) Retard Breaker - Remove timing light leads from the mainbreaker terminals. Attach one positive lead to retard breakerterminal and second positive lead to the tachometer breakerterminal, if used.

(4) Back the engine up a few degrees and again bump forwardtoward number one cylinder firing position until pointer is alignedwith 150 retard timing mark. See figure 5-2. Retard breaker shouldjust open at this position.

5-3


SECTION 5 0-360

Figure 5-1. Ignition Wiring Diagram - Dual Magneto

5-4


0-360 SECTION 5

ANGLES

"E" GAP ANGLES

Figure 5-2. Timing Marks on Rotating Magneto

(5) If retard timing is not correct, loosen cam securing screw andturn the retard breaker cam as required to make retard breaker openper paragraph d(4). Retorque cam screw to 16 to 20 in. lbs.

(6) Observe the tachometer breaker is opened by the cam lobe. Nosynchronization of this breaker is required.

(7) Check action of impulse coupling (D-2000 series only). With theignition switch off observe breaker cam end of rotor while manuallycranking engine through a firing sequence. Rotor should alternatelystop and then (with an audible snap) be rotated rapidly through aretard firing position.

e. Alternator Output - The alternator should be checked to determinethat the specified voltage and current is being obtained.

2. FUEL SYSTEM.

a. Repair of Fuel Leaks · In the event a line or fitting in the fuel systemis replaced, only a fuel soluble lubricant, such as clean engine oil orLoctite Hydraulic Sealant may be used. Do not use any other form ofthread compound.

5-5


SECTION 5 0-360

b. Carburetor Fuel Inlet Screen Assembly - Remove the assembly andcheck the screen for distortion or openings in the strainer. Replace foreither of these conditions. Clean screen assembly in solvent and drywith compressed air and reinstall. The fuel inlet screen assembly istightened to 35-40 inch pounds.

c. Fuel Grades and Limitations - The recommended aviation grade fuelfor the subject engines is listed in Section 3, item 9.

In the event that the specified fuel is not available at some locations,it is permisslbe to use higher octane fuel. Fuel of a lower octane thanspecified is not to be used. Under no circumstances should automotivefuel be used (regardless of octane rating).

NOTE

It is recommended that personnel be familiar with Service Instruction No.1070 and Service Letter No. L185 regarding specified fuel for AvcoLycoming engines.

d. Air Intake Ducts and Filter - Check all air intake ducts for dirt orrestrictions. Inspect and service air filters as instructed in the airframemanufacturer's handbook. Replace any filter or air duct that showssigns of deterioration or collapse.

e. Idle Speed and Mixture Adjustment -

(1) Start the engine and warm up in the usual manner until oil andcylinder head temperatures are normal.

(2) Check magnetos. If the "mag-drop" is normal, proceed with idleadjustment.

(3) Set throttle stop screw so that the engine idles at the airframemanufacturer's recommended idling RPM. If the RPM changesappreciably after making idle adjustment during the succeedingsteps, readjust the idle speed to the desired RPM.

(4) When the idling speed has been stabilized, move the cockpitmixture control lever with a smooth, steady pull toward the "IdleCut-Off" position and observe the tachometer for any change duringthe leaning process. Caution must be exercised to return the mixturecontrol to the "Full Rich" position before the RPM can drop to apoint where the engine cuts out. An increase of more than 50 RPMwhile "leaning out indicates an excessively rich idle mixture. Animmediate decrease in RPM (if not preceded by a momentaryincrease) indicates the idle mixture is too lean.

5-6


0-360 SECTION 5

If the above indicates that the idle adjustment is too rich or toolean, turn the idle mixture adjustment in the direction required forcorrection, and check this new position by repeating the aboveprocedure. Make additional adjustments as necessary until a checkresults in a momentary pick-up of approximately 50 RPM. Eachtime the adjustment is changed, the engine should be run up to 2000RPM to clear the engine before proceeding with the RPM check.Make final adjustment of the idle speed adjustment to obtain thedesired idling RPM with closed throttle. The above method aims at asetting that will obtain maximum RPM with minimum manifold

ressure. In case the setting does not remain stable, check thethrottle linkage; any looseness in this linkage would cause erraticidling. In all cases, allowance should be made for the effect ofweather conditions and field altitude upon idling adjusment.

3. L UBRICA TION SYSTEM.

a. Oil Grades and Limitations - Service the engine in accordance withthe recommended grade oil as specified in Section 3, item 9 d.

b. Oil Suction and Oil Pressure Screens - At each fifty hour inspectionremove, inspect for metal particles, clean and reinstall.

NOTE

On installations employing external oil filters, the inspection of the oilsuction screen is impractical at this time, but should be observed whenlubricating oil is changed.

c. Oil Relief Valve (Non-Adjustable) - The function of the oil pressurerelief valve is to maintain engine oil pressure within specified limits. Thevalve, although not adjustable, may be controlled by the addition of amaximum of nine STD-425 washers under the cap to increase pressureor the use of a spacer (Avco Lycoming P/N 73629 or 73630) todecrease pressure. A modification on later models has eliminated theneed for the spacers. Particles of metal or other foreign matter lodgedbetween the ball and seat will result in faulty readings. It is advisable,therefore, to disassemble, inspect and clean the valve if excessivepressure fluctuations are noted.

d. Oil Relief Valve (Adjustable) - The adjustable oil relief valve enablesthe operator to maintain engine oil pressure within the specified limits.If the pressure under normal operating conditions should consistentlyexceed the maximum or minimum specified limits, adjust the valve asfollows.

5-7


SECTION 5 0-360

With the engine warmed up and running at approximately 2000RPM, observe the reading on the oil pressure gage. If the pressure isabove maximum or below minimum specified limits, stop engine andscrew the adjusting screw out to decrease pressure and in to increasepressure. Depending on installation, the adjusting screw may have onlya screw driver slot and is turned with a screw driver; or may have thescrew driver slot plus a pinned .375-24 castellated nut and may beturned with either a screw driver or a box wrench.

4. CYLINDERS. Although the complete procedure for disassembly andreassembly is given here, it is recommended that, as a field operation,cylinder maintenance be confined to replacement of the entire assembly.Valve replacement should be undertaken only as an emergency measure.

a. Removal of Cylinder Assembly -

(1) Remove exhaust manifold.

(2) Remove rocker box drain tube, intake pipe, baffle and any clipsthat might interfere with the removal of the cylinder.

(3) Disconnect ignition cables and remove spark plugs.

(4) Remove rocker box cover and rotate crankshaft until piston isapproximately at top center of the compression stroke. Theapproximate position may be located by observing top of pistonthrough the spark plug hole and also observing that both valves arein the closed position.

(5) Remove the 5/16 x 24 self-locking nut. Thus remove the valverocker, valve rocker fulcrum shim and rotator from exhaust valve.

NOTE

Do not lose shim when valve rocker fulcrum is removed from cylinderhead.

(6) Remove push rods by grasping ball end and pulling rod out ofshroud tube. Detach shroud tube spring and lock plate and pullshroud tubes through holes in cylinder head.

NOTE

The hydraulic tappets, push rods, rocker arms and valves must beassembled in the same location from which they were removed.

(7) Remove cylinder base nuts, then remove cylinder by pullingdirectly away from crankcase. Be careful not to allow the piston andconnecting rod to drop against the crankcase, as the piston leaves thecylinder.

5-8

AVCO LYCOMINE 76 SERIES OPERATOR'S MANUAL

0-360 SECTION 5

b. Removal of Valves and Valve Springs from Cylinder - Place thecylinder over a block of wood so as to hold the valves in a closedposition. Compress the valve springs using the valve spring compressor.Remove the split keys from the end of the valve stem. The valve springsand valve spring seats may now be removed from the cylinder head.Hold the valve stems so that the valves will not fall out and remove thecylinder from the holding block. The valves may now be removed fromthe inside of the cylinder.

c. Removal of Piston from Connecting Rod - Remove the piston pinplugs. Insert piston pin puller through piston pin, assemble puller nut;then proceed to remove piston pin. Do not allow connecting rod to reston the cylinder pad of the crankcase. Support with heavy rubber bands,discarded cylinder base oil ring seals or any other method.

d. Removal, Disassembly, Cleaning, Inspection and Reassembly ofHydraulic Lifters -

(1) Lifter can be withdrawn by fingers.

(2) Being careful not to scratch socket, insert a screw driver intolifter and push. This will force the trapped oil out of the vent holeand release the pressure on the circlip.

(3) Remove and discard the circlip.

CAUTION

Upon release, circlip may spring up with great force. Be careful!

(4) Remove the spring, plunger and socket from the lifter and cleanthe parts and the lifter body in solvent. Inspect the lifter body forthe following imperfections.

Spalling - If the face of the lifter shows small nicks orindentations near the center of the face, it is considered pitted orspalled. The pitting will constitute small irregular holes, not to beconfused with Rockwell hardness check marks which are roundand even. The area covered by spalling will vary with differentlifters, but regardless of the degree, the lifter must be replaced.

5-9

AVCO LYCOMING 76 SERIES OPERATOR'S MANUAL'

SECTION 5 0-360

Scoring - The lifter face is scored when small scratchlike lines arefound on the surface. These marks are usually found near the outeredge of the face and will appear to radiate from the center. Otherscoring marks may be present and extend to the center of the lifterface. Any lifter, with this condition in evidence, must be replaced.

Face Wear - The operation of the lifter provides that the lifterrotates during wiping operation of the cam. This will form agroove, or path. This path will extend all the way across the faceand deeper penetrations will be noted at the center of the face. Ifthe wear is excessive, it will be noticeable to the touch if the finger-nail is rubbed across the lifter face. This condition requiresreplacement of the lifter body.

(5) Reassemble the spring, plunger and socket into the body andsecure with a new circlip.

NOTE

The lifter must be perfectly dry to obtain proper dry tappet clearance.

e. Assembly of Valves in Cylinder -

(1) Prelubricate valve stems and interior of valve guides withMolytex Grease 0 or equivalent and insert each valve stem in itsrespective guide. Hold valve stems to prevent falling from cylinder.

(2) Place cylinder over a wood block so that the valves are heldagainst the seats and assemble to lower spring seat, auxiliary valvespring and outer valve spring over the valve stem and guide. Placethe upper spring seat on top of the springs.

NOTE

When installing valve springs, place the dampener end of spring (closewound coils marked with dye or lacquer) toward the cylinder.

Using a valve spring compressor (Service Tool ST-419) compress thevalve springs and place the split keys in the groove around the upper endof the valve stem. Slowly release the pressure on the valve spring com-pressor and allow the upper spring seat to lock itself in place around thevalve keys.



0-360 SECTION 5

f. Assembly of Cylinder and Related Parts - Rotate the crankshaft sothat the connecting rod of the cylinder being assembled is at the topcenter position and both tappets are on the base circle of the cam lobe.They can be checked by rocking the crankshaft over center. The tappetshould not move at this position.

(1) Install lifter assembly in its respective position in the crankcase.

(2) Assemble piston with rings so that the cylinder number stampedon the piston pin boss is toward the front of the engine. The pistonpin should be a handpush fit. If difficulty is experienced in insertingthe piston pin, it is probably caused by carbon or burrs in the pistonpin hole. Inspect and correct any problem that hinders theinstallation of the piston pin. During assembly, always use agenerous quantity of oil, both in the piston pin hole and on thepiston pin.

(3) Assemble one piston pin plug at each end of the piston pin andplace a new rubber oil seal ring around the cylinder skirt. Coatpiston and rings and the inside of the cylinder generously with oil.

(4) Using a piston ring compressor, assemble the cylinder over thepiston so that the intake and exhaust ports are at the bottom of theengine. Push the cylinder all of the way on, catching the ringcompressor as it is pushed off.

NOTE

Before installing cylinder hold-down nuts, lubricate crankcase throughstud threads with any one of the following lubricants, or combination oflubricants.1. 90% SAE 50W engine oil and 10% STP.2. Parker Thread Lube.3. 60% SAE 30 engine oil and 40% Parker Thread Lube.

(5) Install cylinder base hold down nuts and tighten as directed inthe following steps.

NOTE

At any time a cylinder is replaced, it is necessary to retorque thethru-studs on the cylinder on the opposite side of the engine.

(a) lighten 1/2 inch hold down nuts to 300 inch pounds (25 footpounds) torque, using the sequence beginning with the top rightnut and proceeding clockwise.

5-11

:;7AVCO LYCOMING 76 SERIES OPERATOR'S MANUAL-

SECTION 5 0-360

(b) Using the same sequence tighten hold down nuts to 600 inchpounds (50 foot pounds) torque.

(c) Tighten 3/8 inch hold down nut to 300 inch pounds (25 footpounds) torque. Sequence of tightening is optional.

(d) As a final check, hold the torque wrench on each nut, at theproper torque, for about five seconds. If the nut does not turn, itmay be presumed to be tightened to correct torque.

CAUTION

After all cylinder base nuts have been tightened, remove any small nicksin the cylinder fins by filing or burring.

(6) Install a new large oil seal on the crankcase end of each shroudtube and fit a new small oil seal in the groove provided in the rockerbox end of each shroud tube. Install each shroud tube throughrocker box and seat the end firmly in the crankcase. Place a spring, alockplate and nut over the stud provided in the rocker box andsecure both shroud tubes in place. Bend the tang of the lockplate toprevent the nut and spring from loosening.

(7) Assemble each push rod in its respective shroud tube, and assem-ble each fulcrum and rocker arm on its respective stud. Install aplain 5/16 x 24 nut to hold rocker in place. Before installing exhaustvalve rocker, place rotator cap over end of exhaust valve stem.

(8) Be sure that the piston is at top center of compression stroke andthat both valves are closed. Check clearance between the valve stemtip and the valve rocker. In order to check this clearance, place thethumb of one hand on the valve rocker directly over the end of thepush rod and push down so as to compress the hydraulic tappet spr-ing. While holding the spring compressed, the valve clearanceshould be between .028 and .080 inch. If clearance does not comewithin these limits, add or subtract shim under fulcrum, as requiredto correct clearance. After clearance is set, remove plain 5/16 x 24nut and install 5/16-24 self-locking nut on fulcrum stud. Torque nutto 150 inch pounds.

(9) Install intercylinder baffles, rocker box covers, intake pipes,rocker box drain tubes and exhaust manifold.

6. ALTERNATOR DRIVE BELT TENSION.

Check the tension of a new belt 25 hours after installation. Refer toService Instruction No. 1129 for methods of checking alternator drivebelt tension.5-12 Revised November, 1980

TROUBLE SHOOTING

Page

Failure of Engine to Start ....Failure of Engine to Idle ProperlyLow Power and Uneven RunningFailure of Engine to Develop FullRough Engine ...........Low Oil Pressure .........High Oil Temperature ......Excessive Oil Consumption . . .

. . . .

Power. . . .

· . . .

. ..

. ..

.......... . 6-1

.. ...... ... 6-2

.......... .6-2.......... .6-3

............ 6-4

............ 6-4

.......... . .6-4

........... 6-5


0-360 SECTION 6

SECTION 6

TROUBLE-SHOOTING

Experience has proven that the best method of trouble-shooting is todecide on the various causes of a given trouble and then to eliminatecauses one by one, beginning with the most probable. The following chartslist some of the more common troubles, which may be encountered inmaintaining engines; their probable causes and remedies.

1. TROUBLE-SHOOTING-ENGINE.

TROUBLE PROBABLE CAUSE REMEDY

Failure of Engineto Start

Lack of fuel Check fuel system for leaks.Fill fuel tank. Clean dirtylines, strainers or fuel valves.

Overpriming

Defective sparkplugs

Defective ignitionwire

Leave ignition "off" andmixture control in "IdleCut-Off", open throttleand "unload" engine bycranking for a few seconds.Turn ignition switch on andproceed to start in a nor-mal manner.

Clean and adjust or replacespark plugs.

Check with electric tester,and replace any defectivewires.

Defective battery Replace with chargedbattery.


SECTION 6

TROUBLE

0-360

Failure of Engineto Start (Cont.)

PROBABLE CAUSE

Improper operationof magneto breaker

REMEDY

Lack of sufficientfuel flow

Water in carburetor

Internal failure

Clean points. Check internaltiming of magnetos. Checkimpulse action of dual break-er points. Check lead forgrounding.

Disconnect fuel line andcheck fuel flow.

Drain carburetor.

Check oil screens for metalparticles. If found, completeoverhaul of the engine may beindicated.

Failure of Engineto Idle Properly

Incorrect idlemixture

Adjust mixture.

Leak in inductionsystem

Incorrect idleadjustment

Uneven cylindercompression

Faulty ignitionsystem

Insufficient fuelpressure

Tighten all connections inthe induction system. Replaceany parts that are defective.

Adjust throttle stop to ob-tain correct idle.

Check condition of pistonrings and valve seats.

Check entire ignitionsystem.

Change fuel pump.

Low Power andUneven Running

Mixture too richindicated by slug-gish operationred exhaust flameat night. Extremecases indicated byblack smoke fromexhaust.

Readjustment of carburetorby authorized personnel isindicated.

6-2

7AVCO LYCOMING 76 SERIES OPERATOR'S MANUAL

0-360 SECTION 6

TROUBLE

Low Power andUneven Running(Cont.)

Failure of Engineto Develop FullPower

PROBABLE CAUSE

Mixture too lean;indicated by over-heating or back-firing

Leaks in inductionsystem

Defective sparkplugs

Improper fuel

Magneto breakerpoints not workingproperly

Defective ignitionwire

Defective sparkplug terminalconnectors

Warped exhaustvalve

Leak in inductionsystem

Throttle leverout of adjustment

Improper fuelflow

Restriction inair scoop

Dirty air filterMuffler obstruction

REMEDY

Readjustment of carburetorby authorized personnel isindicated.

Tighten all connections.Replace defective parts.

Clean and gap or replacespark plugs.

Fill tank with fuel ofrecommended grade.

Clean points. Check internaltiming of magnetos.

Check wire with electrictester. Replace defectivewire.

Replace connectors onspark plug wire.

Check compression. Replacevalve if necessary.

Tighten all connectionsand replace defectiveparts.

Adjust throttle lever.

Check strainer gage andflow at the fuel inet.

Examine air scoop andremove restrictions.

Replace filter.

Repair or replace muffler.


SECTION 6

TROUBLE

Failure of Engineto Develop FullPower (Cont.)

0-360

PROBABLE CAUSE

Improper fuel

REMEDY

Drain and refill tank withrecommended fuel.

Faulty ignition

Rough Engine

Low OilPressu re

High OilTemperature

Cracked enginemount

Defective mount-ing bushings

Defective spark plugor ignition lead

Uneven com-pression

Insufficient oil

Chips or dirtin relief valve

Leak in suctionline or pressureline

High oiltemperature

Defective pres-sure gage

Stoppage in oilpump intakepassage

Insufficient aircooling

Tighten all connections.Check system with tester.Check ignition timing.

Replace or repair mount.

Install new mountingbushings.

Replace spark plug orignition leads.

Check compression.

Fill to proper level withrecommended oil.

Remove and clean oilpressure relief valve.

Check gasket between oilpump and accessory section.

See "High Oil Temp-erature' in "Trouble"column.

Replace.

Check line for obstruction.Clean suction strainer.

Check air inlet and outletfor deformation or obstruc-tion.


0-360

TROUBLE

High OilTemperature(Cont.)

SECTION 6

PROBABLE CAUSE

Insufficient oilsupply

REMEDY

Fill to proper level withspecified oil.

Wrong grade of oilfor season

Clogged oil lines,strainers or cooler

Excessiveblow-by

Failing or failedbearing

Excessive OilConsumption

Defective temp-erature gage

Wrong seasonalgrade of oil

Failing or failedbearings

Worn piston rings

Incorrect instal-lation of pistonrings

Failure of rings toseat (new nitridedcylinders)

Replace with oil conform-ing to specifications.

Remove and clean or replaceoil line, strainers, or cooler.

Usually caused by worn orstuck rings.

Examine sump for metalparticles. If found, over-haul of engine is indicated.

Replace gage.

Fill tank with oil con-forming to specifications.

Check sump for metalparticles.

Install new rings.

Install new rings.

Use mineral base oil.Climb to cruise altitudeat full power and op-erate at 75% cruisepower setting until oilconsumption stabilizes.



Preparation of Engine for Installation ....General .............. .......Inspection of Engine Mounting ........Attaching Engine to Mounts ..........Oil and Fuel Line Connections ........Propeller Installation ..............Preparation of Carburetors for InstallationPreparation of Engine for Storage ......Installation Drawing ..............

Page

....... . 7-1........ .7-2........ .7-2........ .7-2

.... . . 7-2. . . .... .7-2........ .7-2

....... . 7-2........ 7-3


0-360 SECTION 7

SECTION 7


1. PREPARATION OF ENGINE FOR INSTALLATION. Before installingan engine that has been prepared for storage, remove all dehydrator plugs,bags of dessicant and preservative oil from the engine. Preservative oil canbe removed by removing the bottom spark plugs and turning thecrankshaft three or four revolutions by hand. The preservative oil will thendrain through the spark plug holes. Draining will be facilitated if theengine is tilted from side to side during the above operation. Preservativeoil which has accumulated in the sump can be drained by removing the oilsump plug. Engines that have been stored in a cold place should beremoved to an environment of at least 70°F. (21°C.) for a period of 24hours before preservative oil is drained from the cylinders. If this is notpossible, heat the cylinders with heat lamps before attempting to drain theengine.

After the oil sump has been drained, the plug should be replaced andsafety-wired. Fill the sump with lubricating oil. The crankshaft shouldagain be turned several revolutions to saturate the interior of the enginewith the clean oil. When installing spark plugs, make sure that they areclean, if not, wash them in clean petroleum solvent. Of course, there willbe a small amount of preservative oil remaining in the engine, but this cancause no harm. However, after twenty-five hours of operation, thelubricating oil should be drained while the engine is hot. This will removeany residual preservative oil that may have been present.

CAUTION

Do not rotate the crankshaft of an engine containing preservative oilbefore removing the spark plugs, because if the cylinders contain anyappreciable amount of the mixture, the resulting action, known ashydraulicing, will cause damage to the engine. Also, any contact of thepreservative oil with painted surfaces should be avoided.

7-1

47AVCO LYCOMING 76 SERIES OPERATOR'S MANUAL

SECTION 7 0-360

General - Should any of the dehydrator plugs, if used, containing crystalsof silica-gel or similar material be broken during their term of storage orupon their removal from the engine, and if any of the contents should fallinto the engine, that portion of the engine must be disassembled andthoroughly cleaned before using the engine. The oil strainers should beremoved and cleaned in gasoline or some other hydrocarbon solvent. Thefuel drain screen located in the fuel inlet of the carburetor should also beremoved and cleaned in a hydrocarbon solvent. The operator should alsonote if any valves are sticking. If they are, this condition can be eliminatedby coating the valve stem generously with a mixture of gasoline andlubricating oil.

Inspection of Engine Mounting - If the aircraft is one from which anengine has been removed, make sure that the engine mount is not bent ordamaged by distortion or misalignment as this can produce abnormal stresswithin the engine.

Attaching Engine to Mounts - See airframe manufacturer'srecommendations for method of mounting the engine.

Oil and Fuel Line Connections - The oil and fuel line connections arecalled out on the accompanying installation drawings.

Propeller Installation - Consult the airframe manufacturer for informationrelative to properller installation.

2. PREPARATION OF CARBURETORS FOR INSTALLATION.

Carburetors that have been prepared for storage should undergo thefollowing procedures before being placed in service.

Carburetor - Remove the fuel drain plug and drain preservative oil.Remove the fuel inlet strainer assembly and clean in a hydrocarbonsolvent. Reinstall the fuel drain plug and fuel inlet strainer assembly.

3. PREPARATION OF ENGINE FOR STORAGE.

Engines installed in aircraft that is inactive should be prepared forcorrosion prevention as described in Service Letter No. L180.

7-2

no

Oo

z

0

m

0

FUELINLET

LEVER

Figure 7-1. Installation DrawingLeft Side View

9

no

mmm

Dm

z >r

Figure 7-3. Installation DrawingRear View


TABLES

Table of Limits ..............Ground Run After Top Overhaul ....Flight Test After Top Overhaul .....Full Throttle HP at Altitude .......Table of Speed Equivalents .......Centigrade-Fahrenheit Conversion TableInch Fraction Conversion ........

Page

........... .8-1........... 8-2

........... .8-3.......... .. .8-4

........... .8-4

........... .8-5.......... .. .8-6

.7AVCO LYCOMING 76 SERIES OPERATOR'S MANUAL

0-360 SECTION 8

SECTION 8

TABLES

FOR TIGHTENING TORQUE RECOMMENDATIONS ANDINFORMATION CONCERNING TOLERANCES AND DIMENSIONSTHAT MUST BE MAINTAINED IN AVCO LYCOMING AIRCRAFT

ENGINES, CONSULT LATEST EDITION OF TABLE OF LIMITS NO.

SSP2070.

8-1

Time5 min

10 min10 min

5 min5 min5 min5 min

RPM1000120013001500160017001800

MAP

FIXED WING ONLY

GROUND RUN AFTER TOP OVERHAULOR CYLINDER CHANGE WITH NEW RINGS

(DO NOT USE AFTER MAJOR OVERHAUL)

Type Aircraft

Registration No.

Aircraft No.1. Avoid dusty location and loose stones.2. Head aircraft into wind. Own3. All cowling should be in place, cowl flaps open.4. Accomplish ground run in full flat pitch. Engin5. Never exceed 200°F. oil temperature.6. If cylinder head temperatures reach 400°F., Dateshut down and allow engine to cool beforecontinuing. Run-

er

ie Model S/N.

Up By

Temperature

L.oil R.oil L.cyl R.cyl

GROUND RUN

Pressure

L.oil R.oil L.fuelfuelfuel

00

n

z

mm

Fuel Flow

Left Right 0m

0

ound Run

Temperature

L.carb R.carb Amb.Air

Mag. Check

Power Check

Idle Check

Adjustment Required After Completion of Gr

1. Visually inspect engir2. Check oil level(s)

0

FLIGHT TEST AFTER TOP OVERHAULOR CYLINDER CHANGE WITH NEW RINGS

1. Test fly aircraft one hour.2. Use standard power for climb, and at least 75% power for cruise.3. Make climb shallow and at good airspeed for cooling.4. Record engine instrument readings during climb and cruise. 0

Tested by

FLIGHT TEST RECORD

Temperature Pressure Temperature Fuel Flow

Time RPM MAP L.oilR.oil L.cyl R.cyl L.oil R.oil L.fuel R.fuel L.carb R.carb Amb.Air Left Right(Climb)Cruise

Adjustments Required After Flight

After Test Flight 0

1. Make careful visual inspection of engine(s).2. Check oil level(s).3. If oil consumption is excessive, (see operator'smanual for limits), remove spark plugs and check -I Zcylinder barrels for scoring.

z:AVCO LYCOMING 76 SERIES OPERATOR'S MANUAL

SECTION 8 0-360

FULL THROTTLE HP AT ALTITUDE(Normally Aspirated Engines)

Altitude % S. L. Altitude % S. L. Altitude % S. LFt. H. P. Ft. H. P. Ft. H. P.

0500

1,0002,0002,5003,0004,0005,0006,0007,0008,0009,000

10098.596.893.692.090.587.584.681.778.976.273.5

10,00011,00012,00013,00014,00015,00016,00017,00017,50018,00018,50019,000

70.868.365.863.461.058.756.554.353.152.151.450.0

19,50020,00020,50021,00021,50022,00022,50023,00023,50024,00024,50025,000

49.148.047.646.045.244.043.342.241.440.339.538.5

TABLE OF SPEED EQUIVALENTS

Sec./Mi. M. P. H. Sec./Mi. M. P. H. Sec./Mi. M. P. H.

72.060.051.445.040.036.032.730.027.725.7

5060708090

100110120130140

24.022.521.220.018.918.017.116.415.615.0

150160170180190200210220230240

14.413.813.312.812.412.011.611.210.910.6

250260270280290300310320330340

"7AVCO LYCOMING 76 SERIES OPERATOR'S MANUAL

0-360 SECTION 8

CENTIGRADE-FAHRENHEIT CONVERSION TABLE

Example: To convert 20°C. to Fahrenheit, find 20 in the center columnheaded (F-C); then read 68.0°F. in the column (F) to the right. To convert20°F. to Centigrade; find 20 in the center column and read -6.67°C. in the(C) column to the left.

C F-C F C F-C F

-56.7 -70 -94.0 104.44 220 428.0-51.1 -60 -76.0 110.00 230 446.0-45.6 -50 -58.0 115.56 240 464.0-40.0 -40 -40.0 121.11 250 482.0-34.0 -30 -22.0 126.67 260 500.0-28.9 -20 -4.0 132.22 270 518.0-23.3 -10 14.0 137.78 280 536.0-17.8 0 32.0 143.33 290 554.0

-12.22 10 50.0 148.89 300 572.0-6.67 20 68.0 154.44 310 590.0-1.11 30 86.0 160.00 320 608.04.44 40 104.0 165.56 330 626.0

10.00 50 122.0 171.11 340 644.015.56 60 140.0 176.67 350 662.021.11 70 158.0 182.22 360 680.026.67 80 176.0 187.78 370 698.032.22 90 194.0 193.33 380 716.037.78 100 212.0 198.89 390 734.043.33 110 230.0 204.44 400 752.048.89 120 248.0 210.00 410 770.054.44 130 266.0 215.56 420 788.060.00 140 284.0 221.11 430 806.065.56 150 302.0 226.67 440 824.071.00 160 320.0 232.22 450 842.076.67 170 338.0 237.78 460 860.082.22 180 356.0 243.33 470 878.087.78 190 374.0 248.89 480 896.093.33 200 392.0 254.44 490 914.098.89 210 410.0 260.00 500 932.0


z;AVCO LYCOMING 76 SERIES OPERATOR'S MANUAL

SECTION 8 0-360

INCH FRACTIONS CONVERSIONSDecimals, Area of Circles and Millimeters

Inch Decimal AreaFraction Equiv. Sq. In

MM Inch Decimal Area MMi. Equiv. Fraction Equiv.

1/641/323/64

1/613/32

7/641/8

5/3211/64

3/617/32

15/641/4

9/3219/64

5/1611/32

23/643/8

13/3227/64

7/1615/32

31/64

.0156

.0312

.0469

.0625

.0937

.1094

.125

.1562

.1719.1875.2187.2344.25.2812.2969.3125.3437.3594.375.4062.4219.4375.4687.4844

.0002 .397 1/2

.0008 .794 17/32

.0017 1.191 35/64

.0031 1.587 9/16

.0069 2.381 19/32

.0094 2.778 39/64

.0123 3.175 5/8

.0192 3.969 21/32

.0232 4.366 43/64

.0276 4.762 11/16

.0376 5.556 23/32

.0431 5.593 47/64

.0491 6.350 3/4

.0621 7.144 25/32

.0692 7.540 51/64.0767 7.937 13/16.0928 8.731 27/32.1014 9.128 55/64.1105 9.525 7/8.1296 10.319 29/32.1398 10.716 59/64.1503 11.112 15/61.1725 11.906 31/32.1842 12.303 63/64

.5

.5312

.5469

.5625.5937.6094.625.6562.6719.6875.7187.734.75.7812.7969.8125.8437.8594.875.9062.9219.9375.9687.9844

Sq. In. Equiv.

.1964 12.700

.2217 13.494

.2349 13.891

.2485 14.288

.2769 15.081

.2916 15.478

.3068 15.875

.3382 16.669

.3545 17.065

.3712 17.462

.4057 18.256

.4235 18.653

.4418 19.050

.4794 19.844

.4987 20.241

.5185 20.637.5591 21.431.5800 21.828.6013 22.225.6450 23.019.6675 23.416.6903 23.812.7371 24.606.7610 25.003

60297-25 - OPERATORS MANUAL - O-360 76 SERIES...

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