Service and Repairs

15
Specifi cations
17 690 01 Rev. L KohlerEngines.com
CLEARANCE SPECIFICATIONS
4
CH245/CH255 CH260/CH270 CH395 CH440
Connecting Rod
Crankpin End I.D. @ 21°C (70°F)
New 30.021/30.026 mm
(1.1819/1.1823 in.)
30.020/30.030 mm
(1.1819/1.1823 in.)
33.020/33.030 mm
(1.3000/1.3004 in.)
37.020/37.030 mm
(1.4575/1.4579 in.)
Max. Wear Limit 30.08 mm
(1.184 in.)
30.106 mm
(1.185 in.)
33.07 mm
(1.302 in.)
37.08 mm
(1.460 in.)
Connecting Rod-to-Crankpin Side Clearance
New 0.58/0.60 mm
(0.023/0.024 in.)
0.58/0.60 mm
(0.023/0.024 in.)
0.73 mm
(0.029 in.)
0.56 mm
(0.022 in.)
Max. Wear Limit 1.10 mm
(0.043 in.)
1.10 mm
(0.043 in.)
1.36 mm
(0.054 in.)
1.06 mm
(0.042 in.)
Connecting Rod-to-Piston Pin
Running Clearance
0.01/0.027 mm
(0.0004/0.0011 in.)
0.008/0.025 mm
(0.0003/0.0010 in.)
0.006/0.028 mm
(0.0002/0.0011 in.)
0.008/0.025 mm
(0.0003/0.0010 in.)
Piston Pin End I.D. @ 21°C (70°F)
New 18.010/18.015 mm
(0.709/0.7093 in.)
18.006/18.017 mm
(0.7089/0.7093 in.)
20.006/20.017 mm
(0.7876/0.7881 in.)
Max. Wear Limit 18.08 mm
(0.712 in.)
18.08 mm (0.712 in.) 20.03 mm
(0.789 in.)
Crankcase
Governor Cross Shaft Bore I.D.
New
6.000/6.024 mm
(0.2362/0.2372 in.)
8.000/8.024 mm
(0.3150/0.3159 in.)
Max. Wear Limit 6.037 mm (0.2377 in.) 8.075 mm (0.3179 in.)
Crankshaft
End Play (free) 0.025/0.703 mm
(0.0010/0.028 in.)
0.0508/0.254 mm (0.002/0.010 in.)
Ball Bearing Internal Clearance 0.003/0.025 mm (0.0001/0.0010 in.) 0.005/0.020 mm
(0.0002/0.0008 in.)
0.006/0.020 mm
(0.0002/0.0008 in.)
Crankshaft O.D. (new)
PTO end 24.975/24.989 mm
(0.9833/0.9838 in.)
29.975/29.989 mm
(1.1801/1.1807 in.)
34.975/34.989 mm
(1.3770/1.3775 in.)
Flywheel end 30.014/30.027 mm
(1.1817/1.1822 in.)
35.009/35.027 mm
(1.3783/1.3790 in.)
Connecting Rod Journal O.D.
New 24.975/24.989 mm
(0.9833/0.9838 in.)
29.975/29.985 mm
(1.1801/1.1805 in.)
32.975/32.985 mm
(1.2982/1.2986 in.)
36.975/36.985 mm
(1.4557/1.4561 in.)
Max. Wear Limit 29.95 mm
(0.9823 in.)
29.924 mm
(1.1781 in.)
32.92 mm
(1.2961 in.)
36.92 mm
(1.4535 in.)
Max. Taper
Max. Out-of-Round
0.025 mm
(0.0010 in.)
2.5 microns (0.0001 in.)
12.7 microns (0.0005 in.)
Width 25.02/25.08 mm
(0.9850/0.9874 in.)
30.30/30.36 mm
(1.1930/1.1953 in.)
28.30/28.36 mm
(1.1142/1.1165 in.)
Runout (either end) 0.025 mm (0.001 in.)
Main Bearing I.D. (Crankcase/
Closure Plate)
New (installed)
24.994/25.000 mm
(0.9840/0.9842 in.)
24.992/25.000 mm
(0.9839/0.9842 in.)
29.990/30.000 mm
(1.1807/1.1811 in.)
34.988/35.000 mm
(1.3775/1.3779 in.)
4
Values are in Metric units. Values in parentheses are English equivalents.