Weichai America Corp.
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7.
Clean the upper thrust washer, and press it into the cylinder block, always with the oil groove
of upper thrust washer outwards (towards the crankshaft).
8.
With the oil seal flat/not distorted, place the oil seal into the seal ring groove on the lower
plane of cylinder block with a special tool.
9.
Press lower main bearing bush and lower thrust washer into the crankcase (with the oil groove
towards the crankshaft), assemble crankcase.
10.
Apply clean lubricating oil to the thread bearing face of crankcase and the threads of main
bearing bolt, install the main bearing bolts without tightening, and then tighten all main
bearing bolts in the sequence as shown in Fig. 3-2.
Fig 3- 2 Tightening sequence of main bearing bolts
11.
Tighten the main bearing bolts by using low torque pneumatic wrench for the first time, then
tighten to 80Nm for the second time, and 250Nm ~280Nm for the third. Crankshaft
assembling is completed.
3.1.5 Inspection and repair of crankshaft
1.
Check rounded corners of the main bearing journal and connecting rod journal, the contacting
part of crankshaft and bearing for cracks, and clean the oil passage.
2.
Check the main bearing journal and connecting rod journal for wear, visible linear traces,
metal flake and cracks.
3.
Check the wear condition of front/rear oil seals.
4.
Check the main bearing bolts for thread damage or other failures.
5.
Check the front and rear threaded holes of crankshaft flange for cracks.
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