Weichai America Corp.
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4)
Clean up cylinder inner wall, crankshaft connecting lever and piston-rod assembly, and apply
clean lubricating oil on each motion pair.
5)
Adjust opening direction of each ring: The opening direction of first compression ring should
be 30° to piston pin center line, opening direction of the second compression ring should be
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.
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: 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.
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