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Piston Rings, Remove and Install
 Remove
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Remove piston with con-rod – see operation "Piston with
Con-rod, Remove and Install".
Remove piston rings with piston ring pliers (1).
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 Clean
Clean piston ring grooves – use ground-down side of old
piston ring.
Inspect
Check piston ring gap with feeler
gauge by inserting piston ring at narrowest point of the cylinder
bore.
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Permissible ring gap:
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Squared ring (2):
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0.30 to 0.50 mm.
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Tapered ring (3):
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0.30 to 0.50 mm.
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Oil scraper ring (4):
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0.40 to 1.40 mm.
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Inspect
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Check piston ring vertical play with
feeler gauge in piston ring groove.
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Permissible vertical play:
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Squared ring (1):
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see Technical Data
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Tapered ring (2):
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see Technical Data
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Oil scraper ring (3):
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see Technical Data
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Install
Insert piston rings with piston ring pliers and identification
"TOP" upwards in piston.
Piston ring positioning – piston rings (I) (rectangular
and tapered compression rings) offset 180°. Oil scraper rings
(II) – offset 25 to 50 mm. to left and right from gap of
intermediate ring.
Install piston with con-rod – see operation "Piston with
Con-rod, Remove and Install".
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