Service Manual

10
Specifi cations
KohlerEngines.com 66 690 01 Rev. C
CLEARANCE SPECIFICATIONS
3
LH630 LH640 LH685 LH690 LH750 LH755
Piston, Piston Rings, and Piston Pin (continued)
Piston Style B
Piston-to-Piston Pin 0.006/0.017 mm (0.0002/0.0007 in.)
Piston Pin Bore I.D.
New
Max. Wear Limit
17.006/17.012 mm (0.6695/0.6698 in.)
17.025 mm (0.6703 in.)
Piston 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 0.030/0.070 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 Bore
Used Bore (Max.)
0.100/0.279 mm
(0.0039/0.0110 in.)
0.490 mm
(0.0192 in.)
0.189/0.277 mm
(0.0074/0.0109 in.)
0.531 mm
(0.0209 in.)
Middle Compression Ring End Gap
New Bore
Used Bore (Max.)
1.400/1.679 mm
(0.0551/0.0661 in.)
1.941 mm
(0.0764 in.)
1.519/1.797 mm
(0.0598/0.0708 in.)
2.051 mm
(0.0808 in.)
Piston Thrust Face O.D.
New
79.966 mm
(3.1483 in.)
8
82.978 mm
(3.2668 in.)
7
Max. Wear Limit 79.821 mm
(3.1426 in.)
8
82.833 mm
(3.2611 in.)
7
Piston Thrust Face-to-Cylinder Bore Running
Clearance
0.025/0.068 mm
(0.0010/
0.0027 in.)
8
0.019/0.062 mm
(0.0007/
0.0024 in.)
7
Valves and Valve Lifters
Hydraulic Valve Lift er to Crankcase Running
Clearance
0.0124/0.0501 mm (0.0005/0.0020 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.)
7.134 mm (0.2809 in.)
Intake Valve Stem Diameter
New 6.982/7.000 mm (0.2749/0.2756 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.)
Exhaust Valve Stem Diameter
New 6.970/6.988 mm (0.2744/0.2751 in.)
Valve Guide Reamer Size
Standard
0.25 mm O.S.
7.048 mm (0.2775 in.)
7.298 mm (0.2873 in.)
Intake Valve Lift 8.88 mm (0.3496 in.)
Exhaust Valve Lift 8.88 mm (0.3496 in.)
Nominal Valve Seat Angle 45°
3
Values are in Metric units. Values in parentheses are English equivalents.
7
Measure 6 mm (0.2362 in.) above bottom of piston skirt at right angles to piston pin.
8
Measure 13 mm (0.5118 in.) above bottom of piston skirt at right angles to piston pin.