SDLG WP6, Руководство по обслуживанию

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Service Manual for WP6 Diesel Engine
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connecting rod oblique incision and piston cooling oil gallery inlet should be in the same
direction, apply proper clean lubricating oil on connecting rod small end hole and piston pin.
(3) Arrange the assembled piston-rod assembly in cylinder number order, and then install oil ring,
second compression ring and first compression ring into piston ring grooves orderly with piston
ring plier. The face with mark “TOP” should be upward, and the ring should be flexible in ring
groove.
(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 Fig. 3-28.
(6) Rotate the flywheel with external force until cylinder 1, 6 get to BDC, install thrust plates of
cylinder 1 and 6 (refer to section 337), 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.
Piston pin center line (horizontal)
First compression ring Second compression ring
Oil ring
Fig. 3-28 Schematic diagram for installation of piston rings
(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.