Service Manual

Weichai America Corp.
Revision: August 2019 67
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
Figure below. Firstly pre-tighten to 70Nm, and then tighten each bolt for another 90°±4°.
Assembly of crank shaft is finished.
Fig. 11- 10 Tighten order of main bearing bolts
11.6.4 Inspection and maintenance of crankshaft system
① Check whether there is crack on fillet area of crankshaft main journal and neck of crankshaft;
Check the joint part of crankshaft and main bearing for crack, check and dredge the oil gallery.
② Check the wear condition of crankshaft main journal and neck of crankshaft, and check whether
there is line-like puckering, metal peeling and crack.
③ Check the wear condition of front and rear oil seals.
④ Check whether there is failure like thread damage on main bearing bolts
⑤ Check crankshaft flange bolt holes for crack.
⑥ Check wear condition of crankshaft journal, check bend and distortion condition of crankshaft.
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