Service Manual

Weichai America Corp.
Revision: August 2019 77
For 6-cylinder engine, 14 M14－10.9 main bearing bolts are used to fix the bearings. As shown in Fig.
4-3, start with middle bearings, do the tightening work from middle to two ends evenly, follow the
procedures below: Firstly pre-tighten each bolt to 70Nm, and tighten the bolts for further 90°±4°.
Fig.12- 3 Tighten order of main bearing bolt
Key point 2:
Assembling:
Install the thrust bearing cap on rear end of engine block, and the others are non-thrust bearing cap.
Take the cap two ends as locating basis when assembling; the main bearing bolts cannot be screwed on
if the cap is inversely placed.
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