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Removing, installing and changing piston rings
110
Piston ring arrangement
Fig. 1
1 Compression ring (double-sided keystone ring)
2 Compression ring (tapered compression ring)
3 Oil scraper ring (bevelled-edge ring)
Removing piston rings
Fig. 2
Remove piston with connecting rod.
Clamp connecting rod in a vice using soft jaws.
Adjust piston ring pliers to piston diameter.
Fig. 3
Apply piston ring pliers at piston ring gap and
unclip piston rings from piston ring grooves.
Note:
Owing to the hose-type spring the oil scraper
ring has a higher tangential tension.
Carefully clean the piston ring grooves using a
piece of wood.
Do not damage the piston ring grooves.
Checking ring gap
Fig. 4
Insert piston rings singly into the cylinder and as-
certain the ring gap using a feeler gauge.
Replace piston rings if the ring gap is too large.
For ring gap see “Engineering S Data S Setting val-
ues”.
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