Service manual

Specifi cations
1162 690 01 Rev. C KohlerEngines.com
CLEARANCE SPECIFICATIONS
3
CH940 CH960 CH980 CH1000
Cylinder Head
Max. Out-of-Flatness 0.076 mm (0.003 in.)
Governor
Governor Cross Shaft-to-Crankcase Running Clearance 0.025/0.087 mm (0.0009/0.0034 in.)
Governor Cross Shaft O.D.
New
Max. Wear Limit
7.963/8.000 mm (0.3135/0.3149 in.)
7.936 mm (0.3124 in.)
Governor Gear Shaft-to-Governor Gear Running Clearance 0.070/0.160 mm (0.0027/0.0063 in.)
Governor 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 (0.030 in.)
Ignition Module Air Gap 0.28/0.33 mm (0.011/0.013 in.)
Crankshaft Bearing (fl ywheel/PTO)
New (installed)
Max. Wear Limit
45.040/45.145 mm (1.773/1.777 in.)
45.158 mm
Piston, Piston Rings, and Piston Pin
Piston-to-Piston Pin Running Clearance 0.006/0.018 mm (0.0002/0.0007 in.)
Piston Pin Bore I.D.
New
Max. Wear Limit
19.006/19.013 mm (0.7482/0.7485 in.)
19.025 mm (0.7490 in.)
Piston Pin O.D.
New
Max. Wear Limit
18.995/19.000 mm (0.7478/0.7480 in.)
18.994 mm (0.7478 in.)
Top Compression Ring-to-Groove Side Clearance 0.04/0.08 mm (0.0015/0.0031 in.)
Middle Compression Ring-to-Groove Side Clearance 0.04/0.08 mm (0.0015/0.0031 in.)
Oil Control Ring-to-Groove Side Clearance 0.03/0.19 mm (0.0011/0.0074 in.)
Top and Center Compression Ring End Gap
New
Max. Wear Limit
0.30/0.55 mm (0.011/0.021 in.)
0.94 mm (0.037 in.)
Piston Thrust Face O.D.
7
New Bore
Used Bore (max.)
89.953/89.967 mm (3.5414/3.5420 in.)
89.925 mm (3.540 in.)
Piston Thrust Face-to-Cylinder Bore
7
Running Clearance
New 0.033/0.72 mm (0.0013/0.0028 in.)
Valves and Valve Lifters
Hydraulic Valve Lifter to Crankcase Running Clearance 0.012/0.050 mm (0.0004/0.0019 in.)
Intake Valve Stem-to-Valve Guide Running Clearance 0.038/0.076 mm (0.0015/0.0030 in.)
Exhaust Valve Stem-to-Valve Guide Running Clearance 0.050/0.088 mm (0.0020/0.0035 in.)
Intake Valve Guide I.D.
New
Max. Wear Limit
7.038/7.058 mm (0.2771/0.2779 in.)
7.135 mm (0.2809 in.)
Exhaust Valve Guide I.D.
New
Max. Wear Limit
7.038/7.058 mm (0.2771/0.2779 in.)
7.159 mm (0.2819 in.)
Valve Guide Reamer Size
Standard
0.25 mm O.S.
7.048 mm (0.2775 in.)
7.298 mm (0.2873 in.)
Nominal Valve Face Angle 45°
3
Values are in Metric units. Values in parentheses are English equivalents.
7
Measure 11 mm (0.433 in.) above bottom of piston skirt at right angles to piston pin.