Kohler Command PRO EFI - Page 19

Specifi cations
1924 690 01 Rev. S KohlerEngines.com
CLEARANCE
SPECIFICATIONS
3
ECH630-ECH680 ECH730-ECH749 CH26 CH735 CH745
Governor (if equipped)
Governor Cross Shaft -to-
Crankcase Running Clearance
6 mm Shaft
8 mm Shaft
0.025/0.126 mm (0.0009/0.0049 in.)
0.013/0.075 mm (0.0005/0.0030 in.)
0.025/0.126 mm (0.0009/0.0049 in.)
Cross Shaft O.D.
New
Max. Wear Limit
6 mm Shaft
New
Max. Wear Limit
8 mm Shaft
New
Max. Wear Limit
7.949/8.000 mm (0.3129/0.3149 in.)
7.936 mm (0.3124 in.)
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 0.090/0.160 mm (0.0035/0.0063 in.) 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 (0.030 in.)
Crankshaft Position Sensor Air
Gap (only on earlier design
sensor bracket)
0.2-0.7 mm (0.008-0.027 in.)
Crankshaft Position Sensor
Max. Air Gap (only on later
design sensor bracket)
2.794 mm (0.110 in.)
Piston, Piston Rings, and Piston Pin
Piston Style A
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 0.050/0.095 mm (0.0019/0.0037 in.) 0.025/0.048 mm (0.0010/0.0019 in.)
Middle Compression Ring-to-
Groove Side Clearance 0.030/0.075 mm (0.0012/0.00307 in.) 0.015/0.037 mm (0.0006/0.0015 in.)
Oil Control Ring-to-Groove Side
Clearance 0.010/0.011 mm (0.0004/0.0043 in.) 0.026/0.176 mm (0.0010/0.0070 in.)
Top and Center Compression
Ring End Gap
New Bore 0.25/0.56 mm (0.0100/0.0224 in.)
Used Bore (Max.) 0.80 mm (0.0315 in.) 0.94 mm (0.037 in.)
3
Values are in Metric units. Values in parentheses are English equivalents.