Kohler Command PRO ECH630 Service Manual page 17

Piston, Piston Rings, and Piston Pin
Piston-to-Piston Pin Running Clearance ..................................................... 0.006/0.017 mm (0.0002/0.0007 in.)
Piston Pin Bore I.D.
New ............................................................................................................ 17.006/17.012 mm (0.6695/0.6698 in.)
Max. Wear Limit ....................................................................................... 17.025 mm (0.6703 in.)
Piston Pin O.D.
New ............................................................................................................ 16.995/17.000 mm (0.6691/0.6693 in.)
Max. Wear Limit ....................................................................................... 16.994 mm (0.6691 in.)
Top Compression Ring-to-Groove Side Clearance .................................... 0.050/0.095 mm (0.0019/0.0037 in.)
Middle Compression Ring-to-Groove Side Clearance .............................. 0.030/0.075 mm (0.0012/0.00307 in.)
Oil Control Ring-to-Groove Side Clearance ................................................ 0.010/0.011 mm (0.0004/0.0043 in.)
Top and Center Compression Ring End Gap
New ............................................................................................................ 0.025/0.056 mm (0.0010/0.0022 in.)
Max. Wear Limit - ECH630,ECH650,ECH680 ..................................... 0.80 mm (0.0315 in.)
Max. Wear Limit - ECH730,ECH740,ECH749...................................... 0.94 mm (0.037 in.)
Piston Thrust Face O.D. 2
ECH630,ECH650,ECH680....................................................................... 79.962/79.980 mm (3.1481/3.1488 in.)
ECH730,ECH740,ECH749....................................................................... 82.949/82.967 mm (3.2657/3.2664 in.)
Max. Wear Limit - ECH630,ECH650,ECH680...................................... 79.831 mm (3.1430 in.)
Max. Wear Limit - ECH730,ECH740,ECH749...................................... 82.818 mm (3.2606 in.)
Piston Thrust Cylinder-to-Bore
New - ECH630,ECH650,ECH680 ........................................................... 0.020/0.063 mm (0.0008/0.0024 in.)
New - ECH730,ECH740,ECH749 ........................................................... 0.0039/0.082 mm (0.0015/0.0032 in.)
Speed Control Bracket (Assembled to Cylinder Heads)
Fastener Torque ............................................................................................... 10.7 N·m (95 in. lb.) into new holes
Speed Control Bracket (Assembled to Blower Housing)
Fastener Torque ............................................................................................... 2.8 N·m (25 in. lb.) into new holes
Starter Assembly
Thru Bolt Torque ............................................................................................. 5.6-9.0 N·m (49-79 in. lb.)
Mounting Screw Torque (All)........................................................................ 16.0 N·m (142 in. lb.)
Brush Holder Mounting Screw Torque........................................................ 2.5-3.3 N·m (22-29 in. lb.)
Starter Solenoid
Mounting Hardware Torque ......................................................................... 4.0-6.0 N·m (35-53 in. lb.)
Nut, Positive (+) Brush Lead Torque ............................................................ 8.0-11.0 N·m (71-97 in. lb.)
² Measure 6 mm (0.236 in.) above the bott om of the piston skirt at right angles to the piston pin.
2
Running Clearance
Safety and General Information
7.3 N·m (65 in. lb.) into used holes
2.3 N·m (20 in. lb.) into used holes
Section 1
1
1.13