Service Manual

Weichai America Corp.
Revision: August 2019 65
11.5.4 Inspection and maintenance of piston-rod assembly
1) Check whether there is crack on combustor throat fillet and piston pin boss; Check piston skirt
and piston head for cylinder scoring phenomenon; Check wear condition of piston pin hole.
2) Check wear condition of piston ring outer edge; Check wear condition of piston ring upper and
lower end face.
3) Check wear condition of piston pin external surface.
4) Check whether there is crack on connecting rod tip bottom hole, connecting rod body and
connecting rod small end oil hole; Check alloy layer of connecting rod shell for abnormal wear
and peeling phenomenon; Check wear condition of connecting rod side faces, check crooking
condition of connecting rod body.
5) Check wear condition of connecting rod bearing shell, check its alloy layer for discoloration,
peeling and slippage phenomenon.
11.6 Assembly and disassembly of crankshaft system
11.6.1 Exploded view of crankshaft system
Fig. 11- 9 Exploded view of crankshaft system
11.6.2 Steps to disassemble crankshaft system
① Put the engine crankcase upward, and then remove main bearing bolts and place them orderly;
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