Weichai America Corp.
37
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
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
120° to that of the first compression ring, and opening direction of oil ring should be 120° to
both that of first compression ring and second compression ring, also should be perpendicular
to piston pin center line. As shown in Figure below.
Fig. 3-8 Schematic diagram for installation of piston rings
