SDLG WP6, Service Manual

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Service Manual for WP6 Diesel Engine
60
3434 Steps to Assemble Crankshaft
(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 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.
(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. 3-30.
Firstly pre-tighten to 70Nm, and then tighten each bolt for another 90°±4°. Assembly of crank
shaft is finished.
Fig. 3-30 Tighten order of main bearing bolts