Service Manual

Weichai America Corp.
Revision: August 2019 64
120° to that of the first compression ring, and opening direction of oil ring should be 120° to
both that of first compression ring and second compression ring, also should be perpendicular
to piston pin center line. As shown in Figure below.
Fig. 11-8 Schematic diagram for installation of piston rings
6) Rotate the flywheel with external force until cylinder 1, 6 get to BDC, install thrust plates of
cylinder 1 and 6, and screw on connecting rod bolts. Rod parting surface should face left side of
cylinder block (i.e. engine oil cooler side). The numbered pistons should not be mixed, install
each piston to the corresponding cylinder; connecting rod cap and connecting rod should be
used in pairs, apply clean lubricating oil on connecting rod bolts before assembling.
7) Tighten connecting rod bolts:
a, Machine-cut connecting rod: Firstly tighten the bolts to 30Nm in symmetry, and then tighten
each bolts for another 58°~65°, in the meantime tighten torque should be up to 85~135Nm.
Assemble other piston-rods in the same way.
b, Fracture-split connecting rod: Firstly tighten the bolts to 30Nm in symmetry, and then tighten
each bolts for another 120±5°, in the meantime tighten torque should be up to 67~107Nm.
Assemble other piston-rods in the same way.
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