3-38 ENGINE
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! Piston ring groove width
Standard
1st & 2nd: 1.01 – 1.03 mm
Oil : 2.01 – 2.03 mm
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! Piston ring thickness
Standard
1st: 0.975 – 0.990 mm
2nd: 0.970 – 0.990 mm
PISTON RING FREE END GAP AND PISTON
RING END GAP
Before installing piston rings, measure the free end gap of each
ring using vernier calipers. Next, fit the ring in the cylinder, and
measure each ring end gap using a thickness gauge.
If any ring has an excess end gap, replace the ring.
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! Piston ring free end gap
Service Limit
1st: 8.0 mm
2nd: 9.6 mm
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" 09900-20102: Vernier calipers
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! Piston ring end gap
Service Limit
1st: 0.5 mm
2nd: 1.0 mm
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" 09900-20803: Thickness gauge
Oversize piston ring
The following oversize piston rings are used. They bear the follow-
ing identification numbers.
1st 2nd
0.5 mm 50 50
Oversize oil ring
The following oversize oil ring is available as optional part. The
following identification mark (color) is used.
SIZE COLOR
STD Painted red
0.5 mm O.S. Painted blue
Oversize side rail
Just measure out side diameter to identify the size.
1st ring
0.5 mm
O.S.
2nd ring
0.5 mm
O.S.
Oil ring
spacer
Paint
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