Weichai America Corp.
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Fig. 3-2 Exploded view of crankshaft system
3.2.2 Steps to disassemble crankshaft system
1.
Put the engine crankcase upward, and then remove main bearing bolts and place them orderly;
2.
Take down crankshaft and flywheel, remove front and rear thrust plates and flywheel bearing.
Remove oil seals; place the crankshaft on bracket (for long time storage, the crankshaft
should be placed vertical);
3.
Classify the removed parts according to the requirements
3.2.3 Steps to assemble crankshaft system
1.
Clean up cylinder bottom holes.
2.
Press main bearing upper shell into cylinder bottom holes and clean up scraped foreign
matters
The bearing shell should be strictly inspected for bump damage before assembling, and shell
with bump damage should not be reused even if repaired.
The assembled upper bearing shell should be aligned to oil hole and oil groove on cylinder
body, misalignment exceeds 1/5~1/4 of oil hole is strictly forbidden. The assembled upper
bearing shell should be closely fit with cylinder bottom holes.
3.
Apply clean lubricating oil on inner surface of upper bearing shell.
4.
Clean up undersurface of cylinder block, and make sure there is no grease.
5.
Apply sealant on undersurface of cylinder block properly.
6.
Lift up crankshaft, and clean up oil holes with compressed air, wipe out main journal and
connecting rod journal with a towel, and then drop the crankshaft into cylinder body slowly,
