Weichai America Corp.
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ring into the piston ring grooves in sequence, ensuring that the piston ring face with "TOP"
upwards, and the ring could be moved flexibly in the ring groove.
Note: Mark the pistons with G1,G2,G3,G4,G5 according to their weights, when being
installed in the same engine, pistons of same weight group shouldn’t be miss installed.
4.
Wipe the cylinder inner wall, crank arm and piston & connecting rod assembly, and apply
clean lubricating oil to the joints of moving parts.
5.
Adjust the opening positions of rings: the opening of 1st ring should be 30° away from the
piston pin centerline, the opening of 2nd ring should be 120° away from that of the 1st ring,
and the opening of oil ring should be 120° away from both openings of the 1st ring and 2nd
ring, as shown in fig. 5-5.
Fig 3-6 Schematic diagram for included angles between piston rings
6.
Crank the engine to bring the No.1 cylinder and No.6 cylinder to BDC, install the piston &
connecting rod assemblies of No.1 cylinder and No.6 cylinder, and install the connecting rod
bolts without tightening, always with the parting surface of connection rod big end towards the
left side of cylinder block (i.e. the oil cooler side). Pay attention that the piston number should
be the same with the cylinder number, the connecting rod cap should be used in pair with the
connecting rod body, and the connecting rod bolt should be applied with clean lubricating oil
before installation.
1
st
ring
2
nd
ring
Piston pin in
horizontal direction
Oil ring
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