Weichai America Corp.
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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 group
1)
Clean up cylinder bottom holes.
2)
Press main bearing upper shell into cylinder bottom holes and clean up scraped foreign matters.
a: The bearing shell should be strictly inspected for bump damage before assembling, and shell with
bump damage should not be reused even if repaired.
b: 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,
prevent crashing the crankshaft in this process.
7)
Clean up upper thrust plate and press it into cylinder body. Then side with oil groove should
face outward (face to crankshaft).
8)
Check and make sure the oil seal is flat and free of distortion, and then place it into seal groove
on cylinder undersurface with dedicated tool.
9)
Press lower bearing shell and lower thrust plate (the side with oil groove should face
crankshaft) into crankcase and assemble the crankshaft.
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