Weichai America Corp.
35
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.
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.
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.
3.3
Main bearing assembly and disassembly
3.3.1
Exploded view of main bearing
Pos.
Name
Pos.
Name
Pos.
Name
1
Upper main
bearing
2
Lower main
bearing
3
Crankshaft
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