Kubota M5040, Workshop Manual

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1-S66
M5040, M6040, M7040, WSM ENGINE
Piston Ring Gap
1. Insert the piston ring into the lower part of the liner (the least worn
part).
2. Measure the ring gap with a feeler gauge.
3. If the gap exceeds the allowable limit, replace the piston ring.
W1066430
Clearance between Piston Ring and Groove
1. Remove carbon from the ring grooves.
2. Measure the clearance between the ring and the groove with a
feeler gauge or depth gauge.
3. If the clearance exceeds allowable limit, check the new ring.
4. If clearance still exceeds the allowable limit after replacing the
ring, replace the piston.
W1066183
Top ring
Factory spec.
0.25 to 0.40 mm
0.0098 to 0.0157 in.
Allowable limit
1.25 mm
0.0492 in.
Second ring
Factory spec.
0.30 to 0.45 mm
0.0118 to 0.0177 in.
Allowable limit
1.25 mm
0.0492 in.
Oil ring
Factory spec.
0.25 to 0.45 mm
0.0098 to 0.0177 in.
Allowable limit
1.25 mm
0.0492 in.
Factory spec.
Top ring
0.050 to 0.090 mm
0.0020 to 0.0035 in.
Second ring
0.090 to 0.120 mm
0.0035 to 0.0047 in.
Oil ring
0.020 to 0.060 mm
0.0008 to 0.0023 in.
Allowable limit
Top ring
0.15 mm
0.0059 in.
Second ring
0.20 mm
0.0079 in.
Oil ring
0.15 mm
0.0059 in.
KiSC issued 06, 2008 A