Specifi cations
8 24 690 06 Rev. PKohlerEngines.com
TORQUE SPECIFICATIONS
4,6
CH18/CH20/
CH22/
CH620/CH621/
CH640/CH641
CH22/CH23/
CH620
8
/
CH640
8
/
CH670/CH680
CH25/
CH730/
CH740 CH750
Closure Plate
Fastener 24.4 N·m (216 in. lb.)
Connecting Rod
Cap Fastener (torque in increments)
8 mm straight shank
8 mm step-down
6 mm straight shank
22.7 N·m (200 in. lb.)
14.7 N·m (130 in. lb.)
11.3 N·m (100 in. lb.)
Crankcase
Breather Cover Fastener 11.3 N·m (100 in. lb.) into new holes
7.3 N·m (65 in. lb.) into used holes
Oil Drain Plug 13.6 N·m (10 ft. lb.)
Cylinder Head
Fastener (torque in 2 increments)
Nut fi rst to 16.9 N·m (150 in. lb.)
fi nally to 35.5 N·m (315 in. lb.)
Bolt (torque in 2 increments) fi rst to 22.6 N·m (200 in. lb.)
fi nally to 41.8 N·m (370 in. lb.)
Rocker Arm Screw
Black Screw (M6x1.0x34)
Silver Screw (M6x1.0x45)
18.1 N·m (160 in. lb.)
11.9 N·m (105 in. lb.)
Flywheel
Fan Fastener 9.9 N·m (88 in. lb.)
Flywheel Retaining Screw 66.4 N·m (49 ft. lb.)
Fuel Pump-Pulse
Fastener 2.3 N·m (20 in. lb.)
Governor
Lever Nut 6.8 N·m (60 in. lb.)
Ignition
Spark Plug 27 N·m (20 ft. lb.)
Module Fastener 4.0-6.2 N·m (35-55 in. lb.)
Rectifi er-Regulator Fastener 1.4 N·m (12.6 in. lb.)
Muffl er
M8 Hex Nuts 24.4 N·m (216 in. lb.)
M8 Lock Nuts 27.8 N·m (246 in. lb.)
Oil Cooler
Adapter Nipple 27 N·m (20 ft. lb.)
Oil Sentry
™
Pressure Switch 4.5 N·m (40 in. lb.)
4
Values are in Metric units. Values in parentheses are English equivalents.
6
Lubricate threads with engine oil prior to assembly.
8
CH620/CH640 engines changed from 624cc to 674cc; displacement can be confi rmed on engine nameplate.
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