Pistons and Rings
Measure piston ring to groove clearance after
decarbonizing.
Standard piston ring groove width:
• 1 st and 2nd rings: 0.0476 to 0.0484 in.
(1
.
21
to
1.23 mm)
• Oil ring: 0.0988 to 0.0996 in. (2.51 to 2.53 mm)
Standard piston ring thickness:
• 1 st and 2nd rings: 0.0461 to 0.0469
in
. (1.17 to
1.
19mm)
Piston ring to groove clearance:
•
Standard: 1 st and 2nd rings, 0.0008 to 0.0024
in. (0.02 to 0.06 mm)
• Service limit: 1 st and 2nd rings, 0.004 in. (0.10
mm)
If measurement exceeds service limit, replace the
piston and/or piston ring.
004574
POWERHEAD
CYLINDER/CRANKCASE/PISTON ASSEMBLY
Measure piston ring end gap with piston ring
in
the
lowest position
of
cylinder bore. If measurement
exceeds service
limit, replace piston ring.
• Standard: 1 st and 2nd rings, 0.004 to 0.010 in.
(0.10 to 0.25 mm)
• Service limit: 1 st and 2nd rings, 0.020
in
. (0.50
mm)
004575
Measure piston ring free end gap. If measurement
exceeds service
limit, replace piston ring.
• Standard: 1 st ring, approx. 0.23 in.
(5
.8 mm)
2nd ring, approx.
0.29
in.
(7.4 mm)
• Service limit: 1st ring, approx. 0.18 in.
(4
.6 mm)
2nd ring, approx.
0.23 in. (5.9 mm)
004576
157
E
o
U
Qj
)(
~
Qj
~
ii
E
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