Specifications for BMW motorcycle engines

by Duane Ausherman

 

Type Air-cooled horizontally-opposed transverse twin, with pushrod operated overhead valves.

Dimensions Bore Stroke Capacity - Actual R45 70.0mm (2.76") 61.5mm (2.42") 473.1cc (28.86 cu in) R50 67.0mm (2.64") 70.6mm (2.78") 497.6cc (30.35 cu in) R60 73.5mm (2.89") 70.6mm (2.78") 598.8cc (36.53 cu in) R65, R65LS 82.0mm (3.23") 61.5mm (2.42") 649.2cc (39.60 cu in) R75 82.0mm (3.23") 70.6mm (2.78") 745.3cc (45.46 cu in) All 800cc models 84.8mm (3.34") 70.6mm (2.78") 797.1cc (48.62 cu in) R90/6, R90S 90.0mm (3.54") 70.6mm (2.78") 897.8cc (54.77 cu in) All 1000cc models 94.0mm (3.70") 70.6mm (2.78") 979.4cc (59.74 cu in)

Compression ratio (standard values quoted, some machines may have been fittedwith compression plates to reduce compression ratio from standard) R45 9.2 : 1 R50 8.6 : 1 R60 9.2 : 1 R65, R65LS 9.2 : 1 R75 9.0 : 1 R80/7-40 kw version 9.2 : 1

R80/7-37 kw version, all other 800cc models 8.2 : 1 R90/6 9.0 : 1 R90S 9.5 : 1 R100/7 9.0 : 1 R100 (UK) 8.2 : 1 All other 1000cc models* 9.5 : 1*All US machines from 1980 models onwards, compression ratio was reducedto 8.2 : 1.

Recommended engine speeds - rpm: Idle Max. Max. permissible permissible continuous R45 R65 R65LS 800-1100 7300 7650 R50 R60/5 R60/6 R75/5 R75/6 R90/6 600-800 6500 7000 R60/7 800-1100 6500 7200 R75/7 800-1100 6500 7400 All 800cc models 800-1100 7200 7400 R90S 600-800 7000 7300 R100/7 800-1100 6800 7400 All other 1000cc models - UK - all R100T R100S 1977,78 - US - all except below 800-1100 7000 7400 All other 1000cc models - UK - all except those above - US - R100RS 1977 800-1100 7200 7400

Claimed engine output - DIN: Max. power Max. torque

(kw/hp@rpm) (Nm/lbf ft@rpm) R45 26/35@7250 37.4/27.6@5500 R50 24/32@6400 38.3/28.3@5000 R60 29/40@6400 48.1/35.5@5000 R65 1978-80 models* 33/45@7250 50.0/36.9@5500 R65 1981 on models, R65LS* 37/50@7250 52.3/38.6@6500 R75 37/50@6200 58.8/43.4@5000 R80/7 - high comp. version 40/55@7000 62.5/46.1@5500 R80/7 - low comp. version 37/50@7250 56.6/41.8@5500 R80G/S R80ST* 37/50@6500 56.7/41.9@5000 R80RT 1983, 84 models* 37/50@6500 59.0/43.5@3500 R80, R80RT 85 on models* 37/50@6500 58.0/42.8@4000 R90/6 44/60@6500 73.0/53.9@5500 R90S 49/67@7000 76.0/56.1@5500 R100/7 44/60@6500 73.5/54.2@4000 R100T - US* 44/60@6500 74.6/55.1@5500 R100T - UK, R100S - UK '77, '78 R100S - US, R100RS - US '78, '79, R100RT - US* 48/65@6600 75.0/55.4@5500 R100 - UK 49/67@7000 72.0/53.1@5500 R100S - UK '79, '80, R100RS - UK '77 - '80, R100RT - UK '79, '80 R100RS - US '77* 51/70@7250 76.0/56.1@5500

R100CS R100RS R100RT - UK models '81 on* 51/70@7000 76.0/56.1@6000*All models 1980 on - information applies only to UK models, not availablefor US models.

Direction of engine rotation clockwise, looking from front of machine

Compression pressure R80G/S R80ST R80RT All other models R80 '85 on Good over 9.0bar (131psi) over 10.0bar (145psi) Normal 7.5-9.0bar (109-131psi) 8.5-10.0bar (123-145psi) Poor below 7.5bar (109psi) below 8.5bar (123psi)

Valve clearances - engine cold Normal First 1000km (600m) Inlet Exhaust Inlet Exhaust /5,/6 0.15mm 0.20mm N/Av N/Av (.006") (.008") /7,R80G/S,R80ST,R80RT '83-84 0.10mm 0.15mm 0.15mm 0.20mm (.004") (.006") (.006") (.008") R45,R65,R65LS,R80,R80RT '85 on 0.10mm 0.20mm 0.15mm 0.25mm (.004") (.008") (.006") (.010")

Valve timing - with 2.0mm (.08") valve clearance, tolerance of +-2.5 degrees. R50/5 R60/5 R60/6 '76 R60/7 '78 R60/6 up to 1975 R60/7 '77 Inlet opens 40 deg ATDC TDC

6 deg BTDC Inlet closes 40 deg ABDC 40 deg ABDC 34 deg ABDC Exhaust opens 40 deg BBDC 40 deg BBDC 46 deg BBDC Exhaust closes 40 deg BTDC TDC 6 deg BTDC

All R75 & R90, R80/7 R100/7 All other models R100/7 R100S R100S R100RS '77 R100RS '78 Inlet opens 10 deg BTDC 16 deg BTDC 16 deg BTDC Inlet closes 50 deg ABDC 44 deg ABDC 44 deg ABDC Exhaust opens 50 deg BBDC 56 deg BBDC 56 deg BBDC Exhaust closes 10 deg BTDC 4 deg BTDC 4 deg ATDC

Valves Head diameter: Inlet Exhaust R45 R50 34mm (1.34") 32mm (1.26") R60 R65 up to '80 38mm (1.50") 34mm (1.34") R65 '81 on, R65LS 40mm (1.58") 36mm (1.42") R75, all 800cc models 42mm (1.65") 38mm (1.50") R90/6 R90S R100/7 42mm (1.65") 40mm (1.58") All other 1000cc models 44mm (1.73") 40mm (1.58") Head rim minimum thickness: /5 /6 /7 1.0mm (0.0394") 1.0mm (0.0394") R80G/S R80ST R80RT '83-'84 0.8mm (0.0315") 0.8mm (0.0315") R45 R65 R65LS 1.0-1.5mm

1.0-1.2mm (0.0394-0.0591") (0.0394-0.0472") Head maximum runout: /5 /6 /7 0.025mm (0.0010") 0.025mm (0.0010") R80G/S R80ST R80RT '83-84 0.020mm (0.0008") 0.020mm (0.0008") Overall length: R50/5 102.6-103.0mm 102.1-102.5mm (4.0394-4.0551") (4.0197-4.0354") R45 R65 R65LS 98.8-100.2mm 99.1-99.5mm (3.8898-3.9449") (3.9016-3.9173") R60/5 R60/6 98.2-98.5mm 97.2-97.5mm (3.8661-3.8780") (3.8268-3.8386") R60/7 99.2-99.5mm 98.2-98.5mm (3.9055-3.9173") (3.8661-3.8780") All other models 98.4-98.8mm 98.4-98.8mm (3.8740-3.8898") (3.8740-3.8898")

Valve Guides Length overall: /5 /6 except R90S 54mm (2.1260") R90S, /7 48mm (1.8898") R45 R65 R65LS 45mm (1.7717") R80G/S R80ST R80RT '83-'84 44mm (1.7323") Outside diameter: /5 /6 /7 R80G/S R80ST R80RT '83-84 14.050-

14.061mm (0.5532-0.5536") R45 R65 R65LS 14mm (0.5512") Inside diameter: /5 /6 /7 8mm (0.3150") R45 R65 R65LS 7mm (0.2756") R80G/S R80ST R80RT '83-84 8.000-8.015mm (0.3150-0.3156") Bore in cylinder head: /5 /6 /7 R45 R65 R65LS 14mm (0.5512") R80G/S R80ST R80RT '83-84 14.000-14.018mm (0.5512-0.5519") Interference fit in cylinder head: /5 /6 /7 0.032-0.061mm (0.0013-0.0024") All other models N/Av Oversizes available 0.1 & 0.2mm (0.004 & 0.008") Valve stem/guide standard clearance: Inlet Exhaust R50/5 0.040-0.070mm 0.050-0.080mm (0.0016-0.0028") (0.0020-0.0032") R45 R65 R65LS 0.025-0.055mm 0.040-0.070mm (0.0010-0.0022") (0.0016-0.0028") R60 0.050-0.080mm 0.065-0.095mm (0.0020-0.0032") (0.0026-0.0037") All other models 0.050-0.080mm 0.050-0.080mm (0.0020-0.0032") (0.0020-0.0032") Inlet and exhaust valve stem/guide max. permissible clearance - measured at top of guide: R45 R65 R65LS 0.10mm (0.0039")

All other models 0.15mm (0.0059")

Valve seats Outside diameter: Inlet Exhaust R50/5 36.175-36.200mm 36.140-36.150mm (1.4242-1.4252") (1.4228-1.4232") R45 36.2mm (1.4252") 36.2mm (1.4252") R60 39.175-39.200mm 39.175-39.200mm (1.5423-1.5433") (1.5423-1.5433") R65 R65LS 39.2mm (1.5433") 39.2mm (1.5433") R75/5 43.175-43.200mm 43.140-43.150mm (1.6998-1.7008") (1.6984-1.6988") R75/6 R90/6 R90S 43.175-43.200mm 43.175-43.200mm (1.6998-1.7008") (1.6998-1.7008") R75/7 R80/7 R100/7 43.175-43.200m 43.134-43.200mm (1.6998-1.7008") (1.6982-1.7008") R80G/S R80ST R80RT '83-84 43.175-43.200m 43.134-43.150mm (1.6998-1.7008") (1.6982-1.6988") All other 1000cc models 45.175-45.200mm 45.175-45.200mm (1.7785-1.7795") (1.7785-1.7795") Bore in cylinder head - inlet and exhaust: R50/5 36.00-36.025mm (1.4173-1.4183") R45 36mm

(1.4173") R60 39.00-39.025mm (1.5354-1.5364") R65, R65LS 39mm (1.5354") All 745cc 800cc 900cc, R100/7 43.000-43.025mm (1.6929-1.6939") All other 1000cc models 45.000-45.025mm (1.7717-1.7727") Interference fit in cylinder head: Inlet Exhaust R50/5 R75/5 0.150-0.200mm 0.115-0.150mm (0.0059-0.0079") (0.0045-0.0059") R45 R65 R65LS N/Av N/Av R75/7 R80/7 R100/7 R80G/S R80ST R80RT '83-'84 0.150-0.200mm 0.109-0.150mm (0.0059-0.0079") (0.0043-0.0059") All other models 0.150-0.200mm 0.150-0.200mm (0.0059-0.0079") (0.0059-0.0079") Seat angle: Main seating face 45 deg At combustion chamber 15 deg At inlet/exhaust port 75 deg Seat width: Inlet 1.5mm (0.0591") Exhaust 2.0mm (0.0787") Seat oversizes available 0.2 0.4mm (0.0079 0.0168")

Valve springs Wire thickness 4.25mm (0.1673") Spring free length - approx:

Blue or green code 43.5mm (1.7126") Brown code 46.0mm (1.811") Spring force at test length: At 37.6mm (1.4803") 27.84-30.16 kp (61.30-66.5 lb) At 28.5mm (1.1221") 70.00-72.80 kp (154.30-160.5 lb)

Rocker gear Arm ID -/5 18.032-18.059mm (0.7099-0.7110") Bush OD -/5 18.012-18.030mm (0.7091-0.7098") Arm/bush clearance -/5 0.002-0.047mm (0.00008-0.00185") Bush ID /5 14.532-14.559mm (0.5721-0.5732") Shaft OD /5 14.512-14.530mm (0.5713-0.5720") Bush/shaft clearance /5 0.002-0.047mm (0.00008-0.00185") Arm axial float: R80 R80RT 1985 0.03-0.07mm (0.0012-0.0028") All other models Nil, but arm must be free to move

Camshaft drive chain Type: /5 /6 /7 up to 1978 Duplex roller chain All other models Single row chain Size 3/8 x 7/32" Number of links 50

Camshaft Front (alternator end) bearing bore 40.000-40.039mm (1.5748-1.5763") Front flange bearing OD 39.984-

40.000mm (1.5742-1.5748") Front flange bearing ID 25.000-25.013mm (0.9843-0.9848") Camshaft front bearing journal OD 24.967-24.980mm (0.9830-0.9835") Camshaft radial clearance - at front bearing 0.020-0.046mm (0.0008-0.0018") Rear (flywheel end) bearing bore 24.000-24.021mm (0.9449-0.9457") Camshaft rear bearing journal OD 23.967-23.980mm (0.9436-0.9441") Camshart radial clearance - at rear bearing 0.020-0.054mm (0.0008-0.0021") Camshaft end float 0.080-0.120mm (0.0032-0.0047") Base circle 28mm (1.1024") Cam lift: R50/5 R60 6.198mm (0.2440") All other models 6.756mm (0.2660") Maximum permissible runout of ATU shaft - /5 /6 /7 up to '78 0.02mm (0.0008")

Cam followers and pushrods OD 21.955-21.975mm (0.8644-0.8652") Crankcase ID 21.985-22.006mm (0.8656-0.8664") Follower/crankcase clearance: Standard 0.010-0.051mm (0.0004-0.0020") Service limit 0.075mm (0.0030") Pushrod length: R45 R65 R65LS /5 /6 up to '75 N/Av All other models 274.7-275.3mm (10.8149-10.8386")

Crankshaft and main bearings Journal dimensions Basically the same, but tolerances vary according to model and year. Main bearing bushes Selective fit depending on journal dimensions and radial clearances. Main bearing journal/bush clearance: R45 (UK), R65 (UK), R65LS (UK), all /5 /6 /7 0.035-0.065mm (0.0014-0.0025") /7 '81 on, R80G/S, R80ST, R65 (US), R65LS (US) - red size bush 0.017-0.066mm (0.0007-0.0026") /7 '81 on, R80G/S, R80ST, R65 (US), R65LS (US) - blue size bush 0.019-0.067mm (0.0008-0.0026") Crankshaft regrind stages: 1st 0.25mm (0.0100") 2nd 0.50mm (0.0200") 3rd 0.75mm (0.0300") Max. runout - at front main bearing journal 0.02mm (0.0008") Max. lateral runout at flywheel 0.10mm (0.0008") Crankshaft standard endfloat 0.08-0.15mm (0.0032-0.0059") Thrust washer thickness: Standard - red 2.483-2.530mm (0.0978-0.0996") Standard - blue 2.530-2.578mm (0.0996-0.1015") Standard - green 2.578-2.626mm (0.1015-0.1034") Standard - yellow 2.626-2.673mm

(0.1034-0.1052") Wear limit - all minus 0.20mm (0.0079")

Connecting rods and bearings Crankpin standard OD 47.975-47.991mm (1.8888-1.8894") Crankpin regrind stages: 1st 0.25mm (0.0100") 2nd 0.50mm (0.0200") 3rd 0.75mm (0.0300") Connecting rod big-end ID - less bearing shells: /5, /6, /7 1977 52.000-52.010mm (2.0472-2.0476") All other models 52.000-52.015mm (2.0472-2.0478") Con. rod radial clearance 0.023-0.069mm (0.0009-0.0027") Con. rod big-end width 21.883-21.935mm (0.8615-0.8636") Crankpin width 22.065-22.149mm (0.8657-0.8720") Con. rod axial clearance (endfloat): Standard 0.130-0.266mm (0.0051-0.105") Max. permissible 0.320mm (0.0126") Max. weight difference between con. rods: /5, /6 6 grams (0.2116 oz) /7, R45, R65, R65LS 3 grams (0.1058 oz) R80G/S, R80ST 2 grams (0.0705 oz) Con. rod small-end ID - less bush 24.000-24.021mm (0.9449-0.9457") Small-end bush OD 24.060-24.100mm (0.9472-0.9488") Small-end bush ID:

Standard 22.015-22.020mm (0.8667-0.8669") Max. permissible 22.040mm (0.8677") Gudgeon pin/small-end bush clearance: /5,/6,/7 up to '80 - white coded pin 0.015-0.023mm (0.0006-0.0009") /5,/6,/7 up to '80 - black coded pin 0.018-0.026mm (0.0007-0.0010") /7 '81 on,R80G/S,R80ST 0.015-0.024mm (0.0006-0.0009") R45,R65,R65LS 0.015-0.025mm (0.0006-0.0009") Gudgeon pin OD: /5,/6,/7 up to '80 - white coded pin 21.997-22.000mm (0.8660-0.8661") /5,/6,/7 up to '80 - black coded pin 21.994-21.997mm (0.8659-0.8660") /7 '81 on,R80G/S,R80ST 21.996-22.000mm (0.8659-0.8661") R45,R65,R65LS 21.995-22.000mm (0.8659-0.8661") Gudgeon pin bore ID - in piston: /5,/6,/7 up to '80 - white code (W stamped in piston crown) 22.000-22.003mm (0.8661-0.8662") /5,/6,/7 up to '80 - black code (S stamped in piston crown) 21.997-22.000mm (0.8660-0.8661") /7 '81 on,R80G/S,R80ST 22.000-22.004mm (0.8661-0.8663") R45 22.002-22.007mm (0.8662-0.8664") R65,R65LS 22.005-22.010mm (0.8663-0.8665") Gudgeon pin/piston clearance: /5,/6,/7 up to '80 0.000-0.006mm (0.0000-0.0002") /7 '81 on,R80G/S,R80ST 0.000-0.008mm (0.0000-0.0003") R45 0.002-0.012mm (0.0001-0.0005")

R65,R65LS 0.005-0.015mm (0.0002-0.0006")

Cylinders Type: All models up to 1980 Cast iron sleeve joined to aluminium alloy finned jacket by 'Al-Fin' process R45,R65,R65LS '81 on Aluminium alloy barrel with 'Nikasil' plated bore 1000cc and 800cc, '81 on Aluminium alloy barrel with 'Galnikal' plated bore Cylinder standard bore ID - at specified bore size code: A B C R50/5 67.000mm 67.010mm 67.020mm (2.7368") (2.6382") (2.6386") R45 69.995-70.005mm 70.005-70.015mm 70.015-70.025mm (2.7557-2.7561") (2.7561-2.7565") (2.7565-2.7569") R60/5,R60/6 73.500mm 73.510mm 73.520mm (2.8937") (2.8941") (2.8945") R60/7 73.500-73.510mm 73.510-73.520mm 73.520-73.530mm (2.8937-2.8941") (2.8941-2.8945") (2.8945-2.8949") R65,R65LS 81.995-82.005mm 82.005-82.015mm 82.015-82.025mm (3.2281-3.2285") (3.2285-3.2289") (3.2289-3.2293") R75/5,R75/6 82.000mm 82.010mm 82.020mm (3.2283") (3.2287") (3.2291")

R75/7 82.005-82.015mm 82.015-82.025mm 82.025-82.035mm (3.2285-3.2289") (3.2289-3.2293") (3.2293-3.2297") All 800cc models 84.795-84.805mm 84.805-84.815mm 84.815-84.825mm (3.3384-3.3388") (3.3388-3.3392") (3.3392-3.3396") R90/6,R90S 90.000mm 90.010mm 90.020mm (3.5433") (3.5437") (3.5441") All 1000cc models 94.005-94.015mm 94.015-94.025mm 94.025-94.035mm (3.7010-3.7014") (3.7014-3.7018") (3.7018-3.7022") Rebore sizes: /5,/6,R60/7,R75/7 - 1st 0.50mm (0.020") /5,/6,R60/7,R75/7 - 2nd 1.00mm (0.040") R45&R65 to '80,R80/7 - 1st 0.25mm (0.010") R45&R65 to '80,R80/7 - 2nd 0.50mm (0.020") All 1000cc models to '80 0.25mm (0.010") All models '81 on rebores not possible, pistons and cylinders must be renewed when excessively worn Maximum ovality: R45,R65,R65LS 0.005mm (0.0002") R80G/S,R80ST - 20mm (0.8") from top of bore 0.005mm (0.0002") R80G/S,R80ST - 115mm (4.5") from top of bore 0.010mm (0.0004") All other models 0.010mm (0.0004") Maximum taper: /5,/6 0.010mm (0.0004") All other models 0.020mm (0.0008")

Pistons

Standard OD - at specified size code: A B C R50/5 66.960mm 66.970mm 66.980mm (2.6362") (2.6366") (2.6370") R45 69.955-69.965mm 69.965-69.975mm 69.975-69.985mm (2.7541-2.7545") (2.7545-2.7549") (2.7549-2.7553") R60/5,R60/6 73.460mm 73.470mm 73.480mm (2.8921") (2.8925") (2.8929") R60/7 73.470mm 73.480mm 73.490mm (2.8925") (2.8929") (2.8933") R65,R65LS 81.955-81.965mm 81.965-81.975mm 81.975-81.985mm (3.2266-3.2270") (3.2270-3.2274") (3.2274-3.2278") R75/5,R75/6 81.960mm 81.970mm 81.980mm (3.2268") (3.2272") (3.2276") R75/7 81.965mm 81.975mm 81.985mm (3.2270") (3.2274") (3.2278") All 800cc models 84.765mm 84.775mm 84.785mm (3.3372") (3.3376") (3.3380") R90/6,R90S 89.960mm 89.970mm 89.980mm (3.5417") (3.5421") (3.5425") All 1000cc models 93.960mm 93.970mm 93.980mm (3.6992")

(3.6996") (3.7000") Standard piston/cylinder clearance: /5,/6 0.035-0.045mm (0.0014-0.0018") R60/7 0.020-0.040mm (0.0008-0.0016") R75/7 0.019-0.041mm (0.0007-0.0016") R80/7 0.023-0.047mm (0.0009-0.0029") R45 & R65 up to '80 0.030-0.050mm (0.0012-0.0020") All 1000cc models up to '80 0.028-0.052mm (0.0011-0.0021") All models '81 on 0.030-0.040mm (0.0012-0.0016") Maximum permissible piston/cylinder clearance: /5,/6 0.120mm (0.0047") All other models 0.080mm (0.0032") Piston weight group + or - stamped in piston crown - both pistons must be of the same weight group, i.e. carry the same marking.

Piston rings Top: Type Plain, rectangular section Thickness: /5,/6 1.790-1.810mm (0.705-0.0713") R45 1.478-1.490mm (0.582-0.0587") All other models 1.728-1.740mm (0.0680-0.0685") End gap - installed: R50,R60 0.25-0.40mm (0.0098-0.0158") R45 0.25-0.45mm (0.0098-0.0177")

R75/5,R75/6,R90/6,R90S 0.30-0.45mm (0.0118-0.0177") /7 '81 on 0.40-0.65mm (0.0158-0.0256") All other models 0.30-0.50mm (0.0118-0.0197") Side clearance: /5,/6 0.060-0.070mm (0.0024-0.0028") /7 0.060-0.090mm (0.0024-0.0035") All other models 0.050-0.082mm (0.0020-0.0032") Second: Type Plain, with stepped or tapered face Thickness /5,/6 2.030-2.050mm (0.0799-0.0807") /7, R45 up to '80 2.010-2.022mm (0.0791-0.0796") All other models 1.978-1.990mm (0.0779-0.0784") End gap - installed: R50,R60 0.25-0.40mm (0.0098-0.0158") R45 0.25-0.45mm (0.0098-0.0177") R80G/S,R80ST 0.30-0.50mm (0.0118-0.0197") /7 '81 on 0.40-0.65mm (0.0158-0.0256") All other models 0.30-0.45mm (0.0118-0.0177") Side clearance: /5,/6 0.050-0.060mm (0.0020-0.0024") All other models 0.040-0.072mm (0.0016-0.0028") Oil scraper: Type One piece Thickness:

/5,/6 4.010-4.030mm (0.1579-0.1587") /7 4.010-4.022mm (0.1579-0.1584") R80G/S,R80ST,R45 '81 on 3.478-3.490mm (0.1369-0.1374") R45 up to '80 3.510-3.522mm (0.1382-0.1387") R65,R65LS 3.978-3.990mm (0.1566-0.1571") End gap - installed: R50/5,R60/5 0.20-0.35mm (0.0079-0.0138") R60/6,R60/7 0.25-0.35mm (0.0098-0.0138") R45 0.25-0.45mm (0.0098-0.0177") All other models 0.25-0.40mm (0.0098-0.0158") Side clearance: /5,/6 0.030-0.040mm (0.0012-0.0016") R60/7 0.020-0.050mm (0.0008-0.0020") All other models 0.030-0.062mm (0.0012-0.0024")

Torque wrench settings Component: Nm lb/ft Rocker cover cap nut - R8,R80RT '85 on 20 15 Spark plugs 20-30 15-22 Valve adjuster locknuts 18-23 13.5-17 Cylinder head retaining nuts - all models up to '80: 1st stage 15 11 2nd stage 35 26

3rd stage 40 29.5 Standard setting 38-42 28-31 Cylinder head retaining nuts - all models '81 on: 1st stage 15 11 2nd stage 25 18.5 3rd stage 35 26 Standard setting 35-39 26-29 Exhaust pipe finned nuts: R80,R80RT '85 on 160 118 R45 & R65 '79-'80,/7 up to '80 140-180 103-133 All other models 200-220 148-162 Connecting rod bolts 48-52 35.5-38 Flywheel mounting bolts: /5 58-62 43-46 R60/6 & R75/6 up to 9/74 - 10mm bolts 60-65 44-48 R90/6 & R90S up to 9/74 - 10mm bolts 70-75 52-55 /6 '75 on and all other models - 11mm bolts 100-105 74-77.5 Oil pump pickup mounting bolts 9 6.5 Camshaft flange bearing - all models '79 on 15-18 11-13.5 Sump mounting bolts 9-12 6.5-9 Alternator rotor retaining bolt 23-27 17-20 Starter motor mounting bolts 47.5 35 ATU retaining nut:

/5,/6 6-7 4.5-5 /7 up to '78 5-6 4-4.5 All other models N/App N/App Oil filter inner cover retaining bolt - /5,/6 only 41 30 Engine oil drain plug: Models up to '80 N/Av N/Av All models '81 on 41 30 Oil filter cover mounting bolts 10 7.5 Engine mounting nuts: R80,R80RT '85 on 54.2 40 All other models 70-77 52-57

These specifications were provided by BMW.

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