WEICHAI WD10 Service Manual - page 81
Service Manual for WD10 Diesel Engine
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(6) Check wear condition of crankshaft journal, check bend and distortion condition of crankshaft.
4434 Steps to Assemble Crankshaft
(1) Clean up cylinder bottom holes.
(2) Press main bearing upper shells into cylinder bottom holes and clean up scraped foreign matter.
a) The bearing shells 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 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 shells and lower thrust plates (the side with oil groove should face
crankshaft) into crankcase and assemble the crankshaft.
(10) Apply clean lubricating oil on crankcase bolt bearing surface and main bearing bolt thread.
Place main bearing bolts and pre-tighten them according to the order shown in Fig. 4-37.
Fig.4-37 Tightening order of main bearing bolts