Service and Repairs

17
Specifi cations
17 690 01 Rev. L KohlerEngines.com
CLEARANCE SPECIFICATIONS
4
CH245/CH255 CH260/CH270 CH395 CH440
Piston, Piston Rings, and Piston Pin (continued)
Oil Control Ring-to-Groove Side
Clearance 0.05/0.19 mm (0.0019/0.0075 in.)
0.09/0.15 mm
(0.0035/0.0059 in.)
Piston Thrust Face O.D.
New 67.975/67.985 mm
(2.6762/2.6766
in.)
8
69.975/69.995 mm
(2.755/2.756 in.)
9
77.955/77.975 mm
(3.069/3.070 in.)
10
88.955/88.975 mm
(3.502/3.503 in.)
11
Max. Wear Limit 67.85 mm
(2.6712 in.)
69.82 mm
(2.749 in.)
77.82 mm
(3.064 in.)
88.82 mm
(3.497 in.)
Piston Thrust Face-to-Cylinder
Bore Running Clearance
0.057/0.075 mm
(0.0022/0.0029 in.)
8
0.057/0.075 mm
(0.002/0.003 in.)
9
0.033/0.067 mm
(0.001/0.003 in.)
10
0.025/0.060 mm
(0.001/0.002 in.)
11
Valves and Valve Tappets
Intake and Exhaust Valve Lash 0.0762/0.127 mm (0.003/0.005 in.)
Intake Valve Stem-to-Valve Guide
Running Clearance
0.020/0.044 mm
(0.008/0.0017 in.)
0.038/0.065 mm
(0.0015/0.0026 in.)
0.025/0.055 mm (0.0010/0.0022 in.)
Exhaust Valve Stem-to-Valve
Guide Running Clearance
0.030/0.054 mm
(0.0011/0.0021 in.)
0.085/0.112 mm
(0.0033/0.0044 in.)
0.040/0.07 mm (0.0016/0.0028 in.)
Intake Valve Stem O.D.
New
5.480 mm
(0.2157 in.)
5.50 mm
(0.217 in.) 6.57 mm (0.259 in.)
Max. Wear Limit 5.320 mm
(0.2094 in.)
5.34 mm
(0.210 in.)
6.40 mm (0.252 in.)
Exhaust Valve Stem O.D.
New
5.47 mm
(0.2153 in.)
5.438 mm
(0.214 in.)
6.55 mm (0.258 in.)
Max. Wear Limit 5.305 mm
(0.2088 in.)
5.28 mm
(0.208 in.)
6.41 mm (0.252 in.)
Intake Valve Stem to Guide
New 0.024/0.039 mm
(0.0009/0.0015 in.)
0.025/0.055 mm (0.0010/0.0022 in.)
Max. Wear Limit 0.10 mm (0.0039 in.) 0.13 mm
(0.0051 in.)
0.14 mm
(0.0055 in.)
Exhaust Valve Stem to Guide
New 0.098/0.112 mm (0.0038/0.0044 in.) 0.040/0.070 mm (0.0016/0.0028 in.)
Max. Wear Limit 0.12 mm (0.0047 in.) 0.10 mm
(0.0039 in.)
0.11 mm
(0.0043 in.)
Valve Guide Reamer Size
Standard Intake
5.506 mm
(0.2168 in.)
5.524 mm
(0.2175 in.)
6.608 mm (0.2602 in.)
Standard Exhaust 5.506 mm
(0.2168 in.)
5.536 mm
(0.2179 in.)
6.608 mm (0.2602 in.)
Valve Seat Width 0.800/2.00 mm
(0.0315/0.787 in.)
0.80 mm
(0.0315 in.)
1.10 mm
(0.0433 in.)
1.20 mm
(0.0472 in.)
Nominal Valve Face Angle 30°, 45°, 60° 45°
4
Values are in Metric units. Values in parentheses are English equivalents.
8
Measure 15 mm (0.5905 in.) above bottom of piston skirt at right angles to piston pin.
9
Measure 21.8-22.2 mm (0.8583-0.8740 in.) above bottom of piston skirt at right angles to piston pin.
10
Measure 17.8-18.2 mm (0.7008-0.7165 in.) above bottom of piston skirt at right angles to piston pin.
11
Measure 29.8-30.2 mm (1.1732-1.1890 in.) above bottom of piston skirt at right angles to piston pin.