Piston Rings - Can-Am DS 450 2008 Shop Manual

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1. Circlip installer handle
2. Circlip installer sleeve
3. Piston
NOTE: Take care that the hook of the piston circlip
is positioned properly.
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CORRECT POSITION OF THE PISTON CIRCLIP

PISTON RINGS

Piston Rings Removal
Remove:
– Cylinder head
– Piston.
Piston Rings Inspection
Using a feeler gauge measure each ring/piston
groove clearance. If the clearance is too large, the
piston and the piston rings should be replaced.
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1. Piston
2. Feeler gauge
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Subsection 07 (CYLINDER HEAD/CYLINDER)
RING/PISTON GROOVE CLEARANCE
UPPER COMPRESSION RING
NEW
SERVICE LIMIT
LOWER COMPRESSION RING
NEW
SERVICE LIMIT
OIL SCRAPER RING
NEW
SERVICE LIMIT
Measure ring end gap.
RING END GAP
UPPER COMPRESSION RING
NEW
SERVICE LIMIT
LOWER COMPRESSION RING
NEW
SERVICE LIMIT
OIL SCRAPER RING
NEW
SERVICE LIMIT
To measure the ring end gap place the ring in the
cylinder in the area of 8 to 16 mm (.315 to .630 in)
from top of cylinder.
NOTE: In order to correctly position the ring in the
cylinder, use piston as a pusher.
Using a feeler gauge, check ring end gap. Replace
ring if gap exceeds above described specified tol-
erance.
Piston Rings Installation
Using fingers only, install the oil scraper ring first
with marking "O" on top.
NOTE: First install spring and then the ring of oil
scraper ring.
Section 03 ENGINE
0.025 to 0.070 mm
(.0010 to .0028 in)
0.120 mm (.0047 in)
0.025 to 0.070 mm
(.0010 to .0028 in)
0.120 mm (.0047 in)
0.015 to 0.060 mm
(.0006 to .0024 in)
0.100 mm (.0039 in)
0.15 to 0.40 mm
(.0059 to .0157 in)
1.00 mm (.0394 in)
0.15 to 0.40 mm
(.0059 to .0157 in)
1.00 mm (.0394 in)
0.15 to 0.35 mm
(.0059 to .0138 in)
1.00 mm (.0394 in)
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