Weichai America Corp.
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7.
Tighten the connecting rod bolts as follows: pretighten first, and next tighten diagonally with a
torque of 120 Nm, and finally turn them by 90°±5° to a torque of 170Nm~250 Nm. Complete
the installation for the other cylinders following the same method.
3.2.5 Inspection and repair of piston & connecting rod assembly
1.
Check the rounded corner at the throat of combustion chamber and the piston pin seat for
cracks; check the skirt and head of piston for cylinder scuffing; check the piston pin hole for
excessive wear.
2.
Check if the outer perimeter and the upper and lower end faces of the piston ring are
excessively worn.
3.
Check if the oil ring is rotated flexibly in the piston oil groove.
4.
Check if the outer perimeter of the piston ring is excessively worn.
5.
Check the large end bottom hole, body and small end oil hole of connecting rod for cracks;
check the alloy layer of connecting rod for abnormal wear or metal flake; check the connecting
rod sides for abnormal wear, and check the connecting rod body for bending.
6.
Check the connecting rod bushing for wear, and the alloy layer for discoloring, flake and
sliding etc.
3.3
Disassembly and assembly of crankshaft bearing
3.3.1 Exploded view of crankshaft bearing
Fig 3- 7 Exploded view of crankshaft bearing
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