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KOHLER engines
Born To Run
Command - Single Cylinder Engine Specifications & Tolerances

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All dimensions in millimeters (inches).

Model (Horsepower) CH & CV15 (15)
General Kilowatt (kW) Output (@ 3600 RPM - SAE J1349) 11.2
Horsepower (@ 3600 RPM - SAE J1349) 15
Bore 90 (3.60)
Stroke 67 (2.64)
Displacement 426 cc (26.0 cu. in.)
Balance
Shaft
Bearing
End Play (Free) 0.0575/0.3625 (0.0023/0.0143)
Bore ID. (In Crankcase and Oil Pan, Max. Wear Limit) 20.038 (0.7889)
Balance Shaft Bearing Surface O.D. Max. Wear Limit 19.959 (0.7858)
Camshaft End Play (With shims) 0.076/0.127 (0.003/0.005)
Bore I.D. Max. Wear Limit In Crankcase 20.038 (0.7889)
In Oil Pan 20.038 (0.7889)
Camshaft Bearing Surface
O.D. - Max Wear Limit
Crankcase End 19.959 (0.7858)
Oil Pan End 19.959 (0.7858)
Connecting
Rod
Connecting Rod to Crankpin Running Clearance New 0.030/0.055 (0.0012/0.0022)
Max. Wear Limit 0.07 (0.0025)
Crankshaft End Play (Free) 0.0575/0.4925 (0.0023/0.0194)
Crankshaft sleeve Bearing l.D. - Max. Wear Limit 45.016 (1.7723)
Crankshaft PTO Bearing I.D. - New Installed 44.965/45.003 (1.7703/1.7718)
Max. Wear Limit 45.016 (1.7723)
Crankshaft Bore to Crankshaft
Running Clearance
New 0.03/0.09 (0.0012/0.0035)
Max. Wear Limit 0.115 (0.0045)
Flywheel End Main
Bearing
O.D. - New 44.913/44.935 (1.7582/1.7691)
O.D. - Max. Wear Limit 44.84 (1.765)
Max. Taper 0.022 (0.0009)
Max. Out of Round 0.025 (0.0010)
Closure Plate or Oil Pan
End Main Bearing
O.D. - New 41.915/41 .935 (1.6502/1.6510)
O.D. - Max. Wear Limit 41.86 (1.648)
Max. Taper 0.020 (0.0008)
Max. Out of Round 0.025 (0.0010)
Connecting Rod Journal O.D. - New 38.958/38.970 (1.5338/1.5343)
O. D. - Max. Wear Limit 38.94 (1.5328)
Max. Taper 0.012 (0.0005)
Max. Out of Round 0.025 (0.0010)
Model (Horsepower) CH & CV15 (15)
Cylinder
Bore
Cylinder Bore l.D. New 90.000/90.025 (3.5433/3.5443)
Max. Wear Limit 90.63 (3.5681)
Max. Out of Round 0.12 (0.0047)
Max. Taper 0.05 (0.0020)
Cylinder Head Max. Out of Flatness 0.076 (0.003)
Governor Governor Cross Shaft O.D. - Max. Wear Limit 5.962 (0.2347)
Governor Gear Shaft O.D. - Max. Wear Limit 5.977 (0.2353)
Governor Cross Shaft Bore (In Crankcase) l.D. - Max. Wear Limit 6.063 (0.2387)
Ignition Spark Plug Type (Champion or Equivalent) RC12YC
Spark Plug Gap
1.02 (0.040)
Ignition Module Air Gap 0.203/0.305 (0.008/0.012)

Pistons, Piston Rings,
and Piston Pin

Top Compression Ring to Groove Side Clearance

0.060/0.105 (0.0023/0.0041)

Middle Compression Ring to Groove Side Clearance 0.040/0.085 (0.0015/0.0002)
Oil Control Ring to Groove side Clearance 0.176/0.026 (0.0069/0.0010)
Piston Ring End Gap New Bore 0.27/0.51 (0.010/0.020)
Used Bore (Max.) 0.77 (0.030)
Piston Thrust Face1 (@D1) to Cylinder Bore O.D. - New 89.951/89.969 (3.5413/3.5420)
O.D. - Max. Wear Limit 89.824 (3.5363)
New - Running Clearance 0.031/0.043 (0.0012/0.0016)
Valves and Valve Lifters Intake Valve Guide I.D. - Std. 7.038/7.058 (0.2771/0.2778)
I.D. - Max. Wear Limit 7.134 (0.2809)
Exhaust valve Guide I.D. - Std. 7.038/7.058 (0.2771/0.2779)
I.D. - Max. Wear Limit 7.159 (0.2819)
Intake Valve Minimum Lift 8.96 (0.353)
Exhaust Valve Minimum Lift 9.14 (0.360)
Rocker Arm I.D. - Max. Wear Limit 16.13 (0.640)
Rocker Shaft O.D. - Max. Wear Limit 15.727 (0.619)
Nominal Valve Seat Angle 45o
Hydraulic Lifter to Crankcase Running Clearance 0.0124/0.0501 (0.0005/0.0020)
Intake Valve stem to Valve Guide Running Clearance 0.038/0.076 (0.0015/0.0030)
Exhaust Valve stem to Valve Guide Running Clearance 0.050/0.088 (0.0020/0.0035)

1Measure 6 mm above the bottom of piston skirt at right angles to piston pin.

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