Kubota M105S, Workshop Manual

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1-S66
M105S, WSM ENGINE
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, replace the ring since
compression leak and oil shortage result.
4. If the clearance still exceeds the allowable limit after replacing the
ring, replace the piston.
W1066194
Piston Ring Gap
1. Insert the piston ring into the lower part of the liner (the least worn
out part) with the piston.
2. Measure the ring gap with a feeler gauge.
3. If the gap exceeds the allowable limit, replace the piston ring.
W1066469
Factory spec.
Top ring
0.05 to 0.09 mm
0.0020 to 0.0035 in.
Second ring
0.093 to 0.120 mm
0.0037 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.
Top ring and 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.
KiSC issued 03, 2007 A