Service Manual for WP6 Diesel Engine
47
Fig. 3-18 Bolt tightening
Notes: Set pneumatic impact wrench to gear II for M8 bolts, and gear III for M10 bolts. Tightening
order: 3-7-10-18, follow the sequence of arrows to tighten other bolts. A copper gasket should be
assembled together with bolt 5, pre-tighten it with pneumatic impact wrench firstly and use 13#
open-end wrench for final tightening. Specification of bolt 1, 2, 19, 20, and 21 is M8*45,
specification of bolt 4 is M10*90, specification of bolt 5, 7, 8, 9, and 10 is M8*75. If position 9 and
10 in Fig. 3-18 are for installation of generator support, the bolt specification should be M8*90.
Specification of bolt 11 is M8*25, specification of bolt 18 is M8*35, specification of bolt 16 and 17
is M8*90, specification of bolt 15 is M8*25.
Key point 2:
Assembling:
Oil seals and seal rings should be checked before assembling, make sure there is no damage and no
dirt. For tight oil seal or seal ring, apply some clean engine oil on the shaft first, and then press-in
the seal slowly with dedicated tool, make sure the press-in force is evenly distributed on the seal.
Disassembling:
Removed oil seal mustn’t be reused, replace it with a new one.
3334 Steps to Assemble Engine Front Cover
Assembling steps are contrary to disassembling ones.
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