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• PISTON RING THICKNESS
1) Check the piston ring for damage (scores, scratches, etc.).
2) Measure the piston ring thickness.
• PISTON RING-TO-RING GROOVE CLEARANCE
Install the piston ring on the piston properly. Push the piston
ring in until it is flush with the outer surface of the piston, and
measure the piston ring-to-ring groove clearance.
• PISTON RING END GAP
• PISTON PIN O.D.
1) Check the outer surface of the piston pin for damage
(scores, scratches, etc.).
2) Measure the piston pin O.D. at three levels. Take the
minimum reading to determine the piston pin O.D.
Standard
Service limit
Top
0.975 - 0.990 mm
0.960 mm
(0.0384 - 0.0390 in)
(0.0378 in)
Second
1.175 - 1.190 mm
1.160 mm
(0.0463 - 0.0469 in)
(0.0457 in)
The oil rings are the combination rings. Replace the side rails
and the spacer as a set when either the top or second ring
needs replacement.
Standard
Service limit
Top
0.040 - 0.065 mm
0.100 mm
(0.0016 - 0.0026 in)
(0.0039 in)
Second
0.015 - 0.045 mm
0.100 mm
(0.0006 - 0.0018 in)
(0.0039 in)
Oil
0.055 - 0.140 mm
0.150 mm
(0.0022 - 0.0055 in)
(0.0059 in)
If the measurement exceeds the service limit, replace the
piston ring with a new one and recheck.
If the measurement still exceeds the service limit after
replacing the piston ring, replace the piston with a new one.
Standard
Service limit
Top
0.15 - 0.30 mm
0.80 mm
(0.006 - 0.012 in)
(0.031in)
Second
0.15 - 0.30 mm
0.80 mm
(0.006 - 0.012 in)
(0.031 in)
Oil
0.20 - 0.70 mm
1.00 mm
(0.008 - 0.028 in)
(0.039in)
[2]
END GAP
[1]
PISTON RING
[1]
TOP
[2]
MIDDLE
[3]
BOTTOM
Standard
Service limit
17.994 - 18.000 mm
17.954 mm
(0.7084 - 0.7087 in)
(0.7068 in)
184