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Doosan DB33A - Piston Pin and Connecting-Rod; Snap Ring

Doosan DB33A
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45
Piston head
Front mark
Cylinder numder
marked side
Marked side
1st ring
2nd ring
Oil ring
FOR STEEL LINER
1st ring
2nd ring
Oil ring
FOR CAST LINER
¡¡
Piston pin and connecting-rod (2)
1. Install the connecting-rod to the piston with setting
the marks as illustrated.
2. Install the piston pin into the piston and the
connecting-rod bushing
¡¡
Snap ring (3)
1. Use a pair of snap ring pliers to install the piston pin
snap ring.
2. Check that the piston moves smoothly on the piston
pin.
¡¡
Piston ring (4)
1. Use a piston ring installer to install the three piston
rings.
-Install the piston rings in the following order: oil
ring ¤M2nd compression ring ¤M1st compression
ring.
¡ The marked side of the two compression rings
must be facing up. The undercut side of the 2nd
compression ring will be facing down. As the oil
ring has no any facing mark, it may face in either
direction.
2. Lubricate the piston ring surfaces with engine oil.
3. Check the piston ring rotate smoothly in the piston
ring grooves.
4. Use Cr-coating piston ring for cast liner and normal
piston ring for steel liner.

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