Specifi cations
1962 690 13 Rev. A KohlerEngines.com
CLEARANCE SPECIFICATIONS
2
ECH940 ECH980
Ignition
Spark Plug Gap 0.76 mm (0.030 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 0.006/0.017 mm (0.0002/0.0007 in.)
Piston Pin Bore I.D.
New
Max. Wear Limit
20.006/20.012 mm (0.7876/0.7879 in.)
20.025 mm (0.7884 in.)
Piston Pin O.D.
New
Max. Wear Limit
19.995/20.000 mm (0.7872/0.7874 in.)
19.994 mm (0.7872 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
Max. Wear Limit
0.125/0.304 mm (0.0049/0.0120 in.)
0.515 mm (0.0203 in.)
Middle Compression Ring End Gap
New
Max. Wear Limit
0.900/1.179 mm (0.0354/0.0464 in.)
1.432 mm (0.0564 in.)
Piston Thrust Face O.D.
6
New Bore
Used Bore (max.)
89.972 mm (3.5422 in.)
89.827 mm (3.5365 in.)
Piston Thrust Face-to-Cylinder Bore
6
Running Clearance
New 0.021/0.060 mm (0.0008/0.00236 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°
2
Values are in Metric units. Values in parentheses are English equivalents.
6
Measure 11 mm (0.4331 in.) above bottom of piston skirt at right angles to piston pin.
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