Weichai America Corp.
Revision: August 2019 66
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
11.6.3 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
2.1
The bearing shell should be strictly inspected for bump damage before assembling, and shell
with bump damage should not be reused even if repaired.
2.2
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.
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