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S-63
SM-E3B SERIES WSM
DIESEL ENGINE
Piston Ring Gap
1. Insert the piston ring into the lower part of the cylinder (the least
worn out part) with a piston ring compressor and piston.
2. Measure the ring gap with a feeler gauge.
3. If the measurement exceeds the allowable limit, replace the
piston ring.
W11466710
Clearance between Piston Ring and Piston Ring Groove
1. Clean the rings and the ring grooves, and install each ring in its
groove.
2. Measure the clearance between the ring and the groove with a
feeler gauge.
3. If the clearance exceeds the allowable limit, replace the piston
ring.
4. If the clearance still exceeds the allowable limit after replacing the
ring, replace the piston.
W11485500
Piston ring gap
[Z482-E3B]
[D722-E3B]
[D782-E3B]
Top ring
Factory
spec.
0.15 to 0.30 mm
0.0059 to 0.011 in.
Allowable
limit
1.20 mm
0.0472 in.
Second ring
Factory
spec.
0.30 to 0.45 mm
0.012 to 0.017 in.
Allowable
limit
1.20 mm
0.0472 in.
Oil ring
Factory
spec.
0.15 to 0.30 mm
0.0059 to 0.011 in.
Allowable
limit
1.20 mm
0.0472 in.
Piston ring gap
[Z602-E3B]
[D902-E3B]
Top ring
Factory
spec.
0.20 to 0.35 mm
0.0079 to 0.013 in.
Allowable
limit
1.25 mm
0.0492 in.
Second ring
Factory
spec.
0.35 to 0.50 mm
0.014 to 0.019 in.
Allowable
limit
1.25 mm
0.0492 in.
Oil ring
Factory
spec.
0.20 to 0.35 mm
0.0079 to 0.013 in.
Allowable
limit
1.25 mm
0.0492 in.
Clearance between
piston ring and
piston ring groove
Second ring
Factory
spec.
0.0900 to 0.120 mm
0.00355 to 0.00472 in.
Allowable
limit
0.15 mm
0.0059 in.
Oil ring
Factory
spec.
0.040 to 0.080 mm
0.0016 to 0.0031 in.
Allowable
limit
0.15 mm
0.0059 in.
KiSC issued 03, 2011 A