Specifi cations
TORQUE SPECIFICATIONS
Closure Plate
Fastener
Connecting Rod
Cap Fastener (torque in increments)
8 mm straight shank
8 mm step-down
6 mm straight shank
Crankcase
Breather Cover Fastener
Oil Drain Plug
Cylinder Head
Fastener (torque in 2 increments)
Nut
Bolt (torque in 2 increments)
Rocker Arm Screw
Black Screw (M6x1.0x34)
Silver Screw (M6x1.0x45)
Flywheel
Fan Fastener
Flywheel Retaining Screw
Fuel Pump-Pulse
Fastener
Governor
Lever Nut
Ignition
Spark Plug
Module Fastener
Rectifi er-Regulator Fastener
Muffl er
Retaining Nut
Oil Cooler
Adapter Nipple
Oil Sentry
™
Pressure Switch
Values are in Metric units. Values in parentheses are English equivalents.
4
Lubricate threads with engine oil prior to assembly.
6
8
CH620/CH640 engines changed from 624cc to 674cc; displacement can be confi rmed on engine nameplate.
8
4,6
KohlerEngines.com
CH18/CH20/
CH22/CH23/
CH22/
CH620
CH620/CH621/
CH640
CH640/CH641
CH670/CH680
24.4 N·m (216 in. lb.)
22.7 N·m (200 in. lb.)
14.7 N·m (130 in. lb.)
11.3 N·m (100 in. lb.)
11.3 N·m (100 in. lb.) into new holes
7.3 N·m (65 in. lb.) into used holes
13.6 N·m (10 ft. lb.)
fi rst to 16.9 N·m (150 in. lb.)
fi nally to 35.5 N·m (315 in. lb.)
fi rst to 22.6 N·m (200 in. lb.)
fi nally to 41.8 N·m (370 in. lb.)
18.1 N·m (160 in. lb.)
13.6 N·m (120 in. lb.)
9.9 N·m (88 in. lb.)
66.4 N·m (49 ft. lb.)
2.3 N·m (20 in. lb.)
6.8 N·m (60 in. lb.)
27 N·m (20 ft. lb.)
4.0-6.2 N·m (35-55 in. lb.)
1.4 N·m (12.6 in. lb.)
24.4 N·m (216 in. lb.)
27 N·m (20 ft. lb.)
4.5 N·m (40 in. lb.)
/
CH25/
8
/
CH730/
8
CH740
CH750
24 690 06 Rev. O
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