Specifi cations
12 24 690 06 Rev. KKohlerEngines.com
CLEARANCE SPECIFICATIONS
3
CH18/CH20/
CH22/
CH620/CH621/
CH640/CH641
CH22/CH23/
CH620/
CH640/
CH670/CH680
CH25/
CH730/
CH740
CH750
Piston, Piston Rings, and Piston Pin (Style A continued)
Thrust Face O.D.
8
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
8
Running
Clearance
New 0.039/0.082 mm (0.0015/0.0032 in.)
Piston Style B
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 0.030/0.070 mm (0.001/0.0026 in.)
Middle Compression Ring-to-Groove Side Clearance 0.030/0.070 mm (0.001/0.0026 in.)
Oil Control Ring-to-Groove Side Clearance 0.060/0.190 mm (0.0022/0.0073 in.)
Top Compression Ring End Gap
New Bore 0.100/
0.279 mm
(0.0039/
0.0110 in.)
0.189/0.277 mm
(0.0074/0.0109 in.)
Used Bore (Max) 0.490 mm
(0.0192 in.)
0.531 mm (0.0209 in.)
Middle Compression Ring End Gap
New Bore 1.400/
1.679 mm
(0.0551/
0.0661 in.)
1.519/1.797 mm
(0.0598/0.0708 in.)
Used Bore (Max) 1.941 mm
(0.0764 in.)
2.051 mm (0.0808 in.)
Thrust Face O.D.
New 79.966 mm
(3.1483 in.)
9
82.978 mm (3.2668 in.)
8
Max. Wear Limit 79.821 mm
(3.1426 in.)
9
82.833 mm (3.2611 in.)
8
Piston Thrust Face-to-Cylinder Bore Running
Clearance
New
0.025/
0.068 mm
(0.0010/
0.0027 in.)
9
0.019/0.062 mm
(0.0007/0.0024 in.)
8
3
Values are in Metric units. Values in parentheses are English equivalents.
8
Measure 6 mm (0.2362 in.) above bottom of piston skirt at right angles to piston pin.
9
Measure 13 mm (0.5118 in.) above bottom of piston skirt at right angles to piston pin.
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