Kohler Command PRO CH740NG [10/88] Specifi cations
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Kohler Command PRO CH740NG [10/88] Specifi cations

Kohler Command PRO CH740NG [10/88] Specifi cations
Specifi cations
10 24 690 30 Rev. DKohlerEngines.com
CLEARANCE SPECIFICATIONS
3
CH18/CH20/
CH640
CH23 CH25/
CH730/CH740
Cylinder Head
Max. Out-of-Flatness 0.076 mm (0.003 in.) 0.1 mm (0.004 in.)
Governor
Governor Cross Shaft-to-Crankcase
Running Clearance
6 mm Shaft
8 mm Shaft
0.013/0.075 mm (0.0005/0.0030 in.)
0.025/0.126 mm (0.0009/0.0049 in.)
Cross Shaft O.D.
6 mm Shaft
New
Max. Wear Limit
8 mm Shaft
New
Max. Wear Limit
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.)
Governor Gear Shaft-to-Governor Gear
Running Clearance
0.015/0.140 mm (0.0006/0.0055 in.)
Gear Shaft O.D.
New
Max. Wear Limit
5.990/6.000 mm (0.2358/0.2362 in.)
5.977 mm (0.2353 in.)
Ignition
Spark Plug Gap 0.76 mm (0.03 in.) for All Except NG with CD Fixed
0.51 mm (0.02 in.) for NG with CD Fixed
Module Air Gap 0.28/0.33 mm (0.011/0.013 in.)
Piston, Piston Rings, and Piston Pin
Piston-to-Piston Pin Running Clearance 0.006/0.017 mm (0.0002/0.0007 in.)
Pin Bore I.D.
New
Max. Wear Limit
17.006/17.012 mm (0.6695/0.6698 in.)
17.025 mm (0.6703 in.)
Pin O.D.
New
Max. Wear Limit
16.995/17.000 mm (0.6691/0.6693 in.)
16.994 mm (0.6691 in.)
Top Compression Ring-to-Groove Side Clearance 0.040/0.080 mm
(0.0016/0.0031 in.)
0.030/0.076 mm
(0.0012/0.0030 in.)
0.025/0.048 mm
(0.0010/0.0019 in.)
Middle Compression Ring-to-Groove Side Clearance 0.040/0.080 mm
(0.0016/0.0031 in.)
0.030/0.076 mm
(0.0012/0.0030 in.)
0.015/0.037 mm
(0.0006/0.0015 in.)
Oil Control Ring-to-Groove Side Clearance 0.060/0.202 mm
(0.0024/0.0080 in.)
0.046/0.196 mm
(0.0018/0.0077 in.)
0.026/0.176 mm
(0.0010/0.0070 in.)
Top and Middle Compression Ring End Gap
New Bore 0.25/0.45 mm
(0.0098/0.0177 in.)
0.18/0.46 mm
(0.0071/0.0181 in.)
0.25/0.56 mm
(0.0100/0.0224 in.)
Used Bore (Max) 0.77 mm
(0.030 in.)
0.80 mm
(0.0315 in.)
0.94 mm
(0.037 in.)
Thrust Face O.D.
7
New 76.943/76.961 mm
(3.0292/3.0299 in.)
79.943/79.961 mm
(3.1473/3.1480 in.)
82.949/82.967 mm
(3.2656/3.2664 in.)
Max. Wear Limit 76.816 mm
(3.0242 in.)
79.816 mm
(3.1423 in.)
82.822 mm
(3.2606 in.)
Piston Thrust Face-to-Cylinder Bore
7
Running
Clearance
New
0.039/0.082 mm
(0.0015/0.0032 in.)
3
Values are in Metric units. Values in parentheses are English equivalents.
7
Measure 6 mm (0.24 in.) above bottom of piston skirt at right angles to piston pin.

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