Weichai America Corp.
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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.
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. 3-3 Tighten order of main bearing bolts
3.2.4 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.
