Weichai America Corp.
Revision: August 2019 63
2)
Tilt and lay the engine on its side, rotate the flywheel until the to-be removed piston is in BDC,
and then remove connecting rod bolts and cap;
3)
Rotate the flywheel until the to-be removed piston is in TDC, knock the piston out with wooden
hammer, proceed with caution to avoid jamming cylinder block with connecting rod tip.
4)
Remover other pistons in the same way, number and place them orderly.
5)
Remove circlip on two sides of piston with internal circlip plier and push piston pin out, take
down the connecting rod body. Number the piston pins, connecting rod bodies and place them
orderly.
6)
Remove first compression ring, second compression ring and oil ring with piston ring plier and
mark them.
11.5.3 Steps to assemble piston-rod assembly
1)
Install one circlip into piston circlip groove with internal circlip plier, and rotate the circlip to
ensure it is properly fitted. The end with corner angle should face inward, and its opening
should be upward.
2)
Insert small end of connecting rod into piston inner cavity and align it to piston pin holes, and
then install piston pin, finally install the other circlip to the other side of the piston. Note that
connecting rod oblique incision and piston cooling oil gallery inlet should be in the same
direction, apply proper clean lubricating oil on connecting rod small end hole and piston pin.
3)
Arrange the assembled piston-rod assembly in cylinder number order, and then install oil ring,
second compression ring and first compression ring into piston ring grooves orderly with piston
ring plier. The face with mark “TOP” should be upward, and the ring should be flexible in ring
groove.
4)
Clean up cylinder inner wall, crankshaft connecting lever and piston-rod assembly, and apply
clean lubricating oil on each motion pair.
5)
Adjust opening direction of each ring: The opening direction of first compression ring should
be 30° to piston pin center line, opening direction of the second compression ring should be
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