Kohler Command CH20 Service Manual page 10

Specifi cations
CLEARANCE SPECIFICATIONS
Cylinder Head
Max. Out-of-Flatness
Governor
Governor Cross Shaft-to-Crankcase
Running Clearance
6 mm Shaft
8 mm Shaft
Cross Shaft O.D.
6 mm Shaft
New
Max. Wear Limit
8 mm Shaft
New
Max. Wear Limit
Governor Gear Shaft-to-Governor Gear
Running Clearance
Gear Shaft O.D.
New
Max. Wear Limit
Ignition
Spark Plug Gap
Module Air Gap
Piston, Piston Rings, and Piston Pin
Piston-to-Piston Pin Running Clearance
Pin Bore I.D.
New
Max. Wear Limit
Pin O.D.
New
Max. Wear Limit
Top Compression Ring-to-Groove Side Clearance
Middle Compression Ring-to-Groove Side Clearance
Oil Control Ring-to-Groove Side Clearance
Top and Middle Compression Ring End Gap
New Bore
Used Bore (Max)
Thrust Face O.D. 8
New
Max. Wear Limit
Piston Thrust Face-to-Cylinder Bore
Clearance
New
4 Values are in Metric units. Values in parentheses are English equivalents.
Measure 6 mm (0.24 in.) above bottom of piston skirt at right angles to piston pin.
8
10
4
(0.0016/0.0031 in.)
(0.0016/0.0031 in.)
(0.0024/0.0080 in.)
(0.0098/0.0177 in.)
76.943/76.961 mm
(3.0292/3.0299 in.)
Running
8
KohlerEngines.com
CH18/CH20/
CH640
0.076 mm (0.003 in.)
0.013/0.075 mm (0.0005/0.0030 in.)
0.025/0.126 mm (0.0009/0.0049 in.)
5.975/6.012 mm (0.2352/0.2367 in.)
5.962 mm (0.2347 in.)
7.949/8.000 mm (0.3129/0.3149 in.)
7.936 mm (0.3124 in.)
0.015/0.140 mm (0.0006/0.0055 in.)
5.990/6.000 mm (0.2358/0.2362 in.)
5.977 mm (0.2353 in.)
0.76 mm (0.030 in.) for All Except NG with CD Fixed
0.51 mm (0.020 in.) for NG with CD Fixed
0.28/0.33 mm (0.011/0.013 in.)
0.006/0.017 mm (0.0002/0.0007 in.)
17.006/17.012 mm (0.6695/0.6698 in.)
17.025 mm (0.6703 in.)
16.995/17.000 mm (0.6691/0.6693 in.)
16.994 mm (0.6691 in.)
0.040/0.080 mm 0.030/0.076 mm
(0.0012/0.0030 in.)
0.040/0.080 mm 0.030/0.076 mm
(0.0012/0.0030 in.)
0.060/0.202 mm 0.046/0.196 mm
(0.0018/0.0077 in.)
0.25/0.45 mm 0.18/0.46 mm
(0.0071/0.0181 in.)
0.77 mm 0.80 mm
(0.030 in.) (0.0315 in.)
79.943/79.961 mm
(3.1473/3.1480 in.)
76.816 mm 79.816 mm
(3.0242 in.) (3.1423 in.)
0.039/0.082 mm
(0.0015/0.0032 in.)
CH25/
CH23 CH730/CH740
0.1 mm (0.004 in.)
0.025/0.048 mm
(0.0010/0.0019 in.)
0.015/0.037 mm
(0.0006/0.0015 in.)
0.026/0.176 mm
(0.0010/0.0070 in.)
0.25/0.56 mm
(0.0100/0.0224 in.)
0.94 mm
(0.037 in.)
82.949/82.967 mm
(3.2656/3.2664 in.)
82.822 mm
(3.2606 in.)
24 690 30 Rev. G