Kohler LH630-775 Service Manual page 15

Piston, Piston Rings, and Piston Pin cont.
Top and Middle Compression Ring End Gap cont.
LH685,LH690
New Bore
Top Ring ..................................................................................... 0.180/0.430 mm (0.0071/0.0169 in.)
Middle Ring ............................................................................... 0.250/0.460 mm (0.0098/0.0181 in.)
Used Bore (Max.) .............................................................................. 0.80 mm (0.0315 in.)
LH750,LH755,LH760 LH775
New Bore ........................................................................................... 0.250/0.56 mm (0.0098/0.022 in.)
Used Bore .......................................................................................... 0.94 mm (0.037 in.)
Piston Thrust Face O.D.²
LH630,LH640
New .................................................................................................... 76.968/76.986 mm (3.0302/3.0309 in.)
Max. Wear Limit ............................................................................... 76.840 mm (3.0252 in.)
LH685,LH690
New .................................................................................................... 79.963/79.981 mm (3.1481/3.1488 in.)
Max. Wear Limit ............................................................................... 79.831 mm (3.1430 in.)
LH750,LH755,LH760 LH775
New .................................................................................................... 82.973/82.991 mm (3.2666/3.2673 in.)
Max. Wear Limit ............................................................................... 82.841 mm (3.3136 in.)
Piston Thrust Face-to-Cylinder Bore² Running Clearance
LH630,LH640 ........................................................................................... 0.014/0.057 mm (0.0005/0.0022 in.)
LH685,LH690 ........................................................................................... 0.019/0.062 mm (0.0007/0.0024 in.)
LH750,LH755,LH760 LH775 .................................................................. 0.015/0.058 mm (0.005/0.0022 in.)
Speed Control
Speed Control Bracket Assembly Fastener Torque .................................... 10.7 N·m (95 in. lb.) into new holes
Stator
Stator Mounting Screw Torque ..................................................................... 6.2 N·m (55 in. lb.)
Valve Cover/Rocker Arms
Valve Cover Fastener Torque ........................................................................ 6.2 N·m (55 in. lb.)
Valves and Valve Lifters
Hydraulic Valve Lifter 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 ........................................................................................................... 7.038/7.058 mm (0.2771/0.2779 in.)
Max. Wear Limit ...................................................................................... 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 ........................................................................................................... 7.038/7.058 mm (0.2771/0.2779 in.)
Max. Wear Limit ...................................................................................... 7.159 mm (0.2819 in.)
²Measure 6 mm (0.236 in.) above the bottom of the piston skirt at right angles to the piston pin.
Safety and General Information
7.3 N·m (65 in. lb.) into used holes
Section 1
1
1.13