Kohler Command PRO CH620-CH740 Owner's Manual page 20

Specifi cations
CLEARANCE SPECIFICATIONS
Piston, Piston Rings, and Piston Pin (Style A continued)
Thrust Face O.D.
8
New
Max. Wear Limit
Piston Thrust Face-to-Cylinder Bore
Clearance
New
Piston Style B
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 Compression Ring End Gap
New Bore
Used Bore (Max)
Middle Compression Ring End Gap
New Bore
Used Bore (Max)
Thrust Face O.D.
New
Max. Wear Limit
Piston Thrust Face-to-Cylinder Bore Running
Clearance
New
Values are in Metric units. Values in parentheses are English equivalents.
3
8 Measure 6 mm (0.2362 in.) above bottom of piston skirt at right angles to piston pin.
Measure 13 mm (0.5118 in.) above bottom of piston skirt at right angles to piston pin.
9
12
CH18/CH20/
3
CH620/CH621/
CH640/CH641
Running
8
KohlerEngines.com
CH22/CH23/
CH22/ CH620/
CH640/
CH670/CH680
76.943/ 79.943/
76.961 mm 79.961 mm
(3.0292/ (3.1473/
3.0299 in.) 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.)
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.)
0.030/0.070 mm (0.001/0.0026 in.)
0.030/0.070 mm (0.001/0.0026 in.)
0.060/0.190 mm (0.0022/0.0073 in.)
0.100/
0.279 mm
(0.0039/
0.0110 in.)
0.490 mm
(0.0192 in.)
1.400/
1.679 mm
(0.0551/
0.0661 in.)
1.941 mm
(0.0764 in.)
79.966 mm
(3.1483 in.)
79.821 mm
(3.1426 in.)
0.025/
0.068 mm
(0.0010/
0.0027 in.)
CH25/ CH750
CH730/
CH740
82.949/82.967 mm
(3.2656/3.2664 in.)
82.822 mm (3.2606 in.)
0.189/0.277 mm
(0.0074/0.0109 in.)
0.531 mm (0.0209 in.)
1.519/1.797 mm
(0.0598/0.0708 in.)
2.051 mm (0.0808 in.)
82.978 mm (3.2668 in.)
9
82.833 mm (3.2611 in.)
9
0.019/0.062 mm
(0.0007/0.0024 in.)
9
24 690 06 Rev. K
8
8
8