Post on 28-Mar-2020
AirCooled Engine Technology
AirCooled Engine Technology
Test #3 Review
Covers Chapters 9 & 14 OEM Electrical Worksheets
Electrical Tools Electrical Circuit Troubleshooting
Test #3 Format ≈ 65 Questions True & False
Matching Definitions Short Answer
Electrical System Part Identification Tuneup & Electrical Service Procedures Questions About Electrical Bench Work
AirCooled Engine Technology
Best Way To Study Use Chapters 9, 14, OEM Manual Multimedia!!
Take Notes from Study Guides & Textbook!
From Chapter 9 Study Guide
1. Ignition System Job #1: Transform! 2. Ignition System Job #2: Time the Spark! 3. Maximum Voltage (kV) and Why it’s Needed
From Chapter 9 Study Guide 4. Magneto Ignition System 5. Parts of a Magneto Ignition System 6. Breaker Magneto vs. Electronic Magneto
From Chapter 9 Study Guide
From Chapter 9 Study Guide 7. Atoms 8. Electrons 9. Insulators & Conductors & SemiConductors
From Chapter 9 Study Guide
10. Making Electricity 11. Mechanical 12. Chemical
From Chapter 9 Study Guide
13. Volts, Amps, Ohms, Watts
Volts = Push Amps = Flow Rate Ohms = Resistance
From Chapter 9 Study Guide 13. Volts, Amps, Ohms, Watts 14. Amps: Intensity, Rate of Flow, Current Flow 15. Volts: Pressure, Push, EMF 16. Ohms: Opposite of Flow, Resistance to Flow Ω
From Chapter 9 Study Guide 17. Ohm’s Law Formulas: 18. Circuit Requirements & Conditions:
Consumer has Resistance & Names the Circuit Source has Voltage Conductive Path Carries the Current Flow
Closed Continuity
Open No Continuity
From Chapter 9 Study Guide 19. Induction with Magnetic Fields 20. Moving a Coil 21. Moving a Magnetic Field 22. Increase or Decrease Changes Output 23. Making an Electromagnetic Field
Inducing Electricity by Moving
Magnetic Fields through Coils of Wire
Making a Magnetic Field by Applying Battery Voltage
to a Coil of Wire
From Chapter 9 Study Guide 24. Ignition Coil is a Transformer 25. Iron Magnetic Characteristics & Armatures 26. Primary & Secondary Transformer Coils 27. Where does the Secondary Output Lead To?
Retrofit Kit
From Chapter 9 Study Guide
28. Spark Plug Ceramic Insulator 29. Flashover/Shorting & Reason for Ribs 30. Adjusting Spark Plug Gap 31. Thread Reach = Length of Threads
From Chapter 9 Study Guide
32. Heat Range 33. HotRunning = Long Insulator Nose Path 34. ColdRunning = Short Insulator Nose Path
From Chapter 9 Study Guide 35. Electrode Designs Vary 36. Breaker Points = Mechanically Open Primary 37. Tungsten Coating on Points: Don’t File Them Clean 38. Condenser (capacitor) Prevents Arcing 39. Stop Switch: Primary ShorttoGround
A Shutoff Switch is a ShorttoGround
From Chapter 9 Study Guide 40. Circuit Requirements
Consumer, Source, Conductive Path
41. Circuit Types Series, Parallel, SeriesParallel
42. Circuit Problems Opens, Shorts, High Resistances
From Chapter 9 Study Guide 40. Circuit Requirements
Consumer, Source, Conductive Path
Consumers Resistance
Source Voltage
Conductive Path All the Parts that Carry the Amps
From Chapter 9 Study Guide 41. Circuit Types
Series, Parallel, SeriesParallel
From Chapter 9 Study Guide 42. The 3 Basic Circuit Problems 1) OPENS (no continuity) 2) SHORTS (either to a source of voltage or to a ground)
(on all of the time or off all of the time) 3) HIGH RESISTANCE (reducing the intensity or current flow in the circuit)
From Chapter 9 Study Guide
43. Spark Advance 44. Dwell: Coil Magnetic Field Saturation Time
The advancingstyle Magnetron ® ignition system uses a silicon
controlled rectifier (SCR) that advances ignition timing as rpm increases.
This device is generally used in switching applications. In the normal "off" state, the device restricts current to the leakage
current. When the gatetocathode voltage exceeds a certain
threshold, the device turns "on" and conducts current. The device will remain in the "on" state even after gate current is removed so long as current through the device remains above the holding current. Once current falls below the holding
current for an appropriate period of time, the device will switch "off". If the gate is pulsed and the current through the device is below the latching current, the device will
remain in the "off" state.
From Chapter 9 Study Guide 46. Solid State = Electronic = No Moving Parts 47. CDI Ignition: Fires on Primary Buildup!
From Chapter 9 Study Guide
48. Schematic Symbols – just be aware of them… 49. Battery as a Source for the Primary Coil
From Chapter 9 Study Guide
50. Battery Theory: 2 Dissimilar Metals in Acid
From Chapter 14 Study Guide
1. Why Tuneup? (Less Fuel Used, Better Performance, Lower Emissions) 2. Spark Plug: kilo Volts & who controls/demands it 3. Used Plug requires more kV to fire! 4. Visually Examine the Plug! Get the Story!
From Chapter 14 Study Guide 6. No Abrasive Blasting to Clean Spark Plugs 7. Use a Wire Feeler Gauge to Gap Plugs 8. Plugs are Sealed with Tapered Seat or Washer
From Chapter 14 Study Guide 10. Armature Air Gap Reduces Reluctance 12. Sheared Key Changes Timing of Spark
Causes of Sheared Key (righty/tighty, lefty/loosey) 13. Breaker Shear = No Spark
Electronic Shear = Wrong Time
From Chapter 14 Study Guide 14. Primary Coil: Low Volts & Low Ohms Ω 15. Secondary Coil: High Volts & High Ohms Ω 16. Capacitance in μ Farads – ability to absorb
From Chapter 14 Study Guide 23. CPSC Blade Brake Requirement (3 seconds) 24. CPSC Interlocks on varieties of equipment
Mowers, Snow Throwers, Riding Mowers, Tractors, Chainsaws, Augers, Thatchers, Flymo ® , etc.
24. Interlocks may be ignition, or cranking: Low Oil, Seat Switch, Clutch, PTO, Brake, Chute, Operator Presence in general…
From Chapter 14 Study Guide
26. Battery Temperature & Efficiency 27. Wire Sizes: American Wire Gauge # System
From Chapter 14 Study Guide
31. Charging System Stator & Diode Use 32. The 3 Circuit Problems: Troubleshooting
Opens
Shorts to Ground Shorts to Power Shorted Coils
High Resistances
From Briggs & Stratton Electrical Chapter
3. Spark Tester in Series: Running or Cranking
From Briggs & Stratton Electrical Chapter
4. No Abrasive Blasting! 5. Reason for Resistor Spark Plugs (reduce RFI)
14. Switch Testing: Continuity & No Continuity 15. Cut the Spark & Brake the Flywheel (3 seconds)
From Briggs & Stratton Electrical Chapter
3. Ignition & Cranking Interlocks 4. Diode Theory 5. Full & HalfWave Rectification of AC to DC A Good Diode Tests: .4 to .7 forward & OL reverse
From Tecumseh Electrical Chapter
7. Wiring Diameter & Gauge Numbers 9. Low Oil Shutdown Interlock 10. CPSC – 3 second blade stop time (from 215 MPH!)
12. CPSC – 19,000 feet/minute maximum blade RPM
From Tecumseh Electrical Chapter
13. CDI Electronic Ignition 14. Replace Points & Condenser as a Pair 18. Sheared Key & Kickback vs. Lack of Power
From Tecumseh Electrical Chapter
20. All Original Equipment Manufacturer Say: “No Abrasive Blasting!” “Spend the Money!”
2122. What is Spark Plug “Fouling” What causes Spark Plug Fouling?
From Tecumseh Electrical Chapter
Tools to Know & Know How to Use
Spark Tester
Understand the use a Digital MultiMeter to:
Measure Ignition Coil Resistances
Check the Operation of a Switch 2 ways
Measure Resistance of Stator Coils
Check a Diode
Forward Bias .4 to .7 volt drop
Reverse Bias OL (blocking flow)
Be able to explain that: a diode is used to Rectify AC to DC in a charging system
Know the parts of a Spark Plug
Especially the reason for:
Ceramic Insulator
Insulator Ribs
Thread Reach
Insulator Nose
Side Electrode
Center Electrode
Sealing Method – washer or taper
Quiz Yourself
Test #3 Electrical Parts
AirCooled Engine Technology
These are:
Points & Condenser Charging Stators Armatures Modules
These are:
Points & Condenser Charging Stators Armatures Ignition Modules
These are:
Points & Condenser Charging Stators Armatures Ignition Modules
These are:
Points & Condenser Switches Armatures Ignition Modules
These are:
Points & Condenser Rotors & Stators Diodes & LED’s Flywheels & Keys
These are:
Spark Plugs CPSC’s Armatures Ignition Coils