Kubota SM-E3B Series Workshop Manual page 124

SM-E3B SERIES WSM
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.
Top ring
Piston ring gap
[Z482-E3B]
Second ring
[D722-E3B]
[D782-E3B]
Oil ring
Top ring
Piston ring gap
[Z602-E3B] Second ring
[D902-E3B]
Oil ring
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.
Second ring
Clearance between
piston ring and
piston ring groove
Oil ring
S-63
DIESEL ENGINE
Factory 0.15 to 0.30 mm
spec. 0.0059 to 0.011 in.
Allowable 1.20 mm
limit 0.0472 in.
Factory 0.30 to 0.45 mm
spec. 0.012 to 0.017 in.
Allowable 1.20 mm
limit 0.0472 in.
Factory 0.15 to 0.30 mm
spec. 0.0059 to 0.011 in.
Allowable 1.20 mm
limit 0.0472 in.
Factory 0.20 to 0.35 mm
spec. 0.0079 to 0.013 in.
Allowable 1.25 mm
limit 0.0492 in.
Factory 0.35 to 0.50 mm
spec. 0.014 to 0.019 in.
Allowable 1.25 mm
limit 0.0492 in.
Factory 0.20 to 0.35 mm
spec. 0.0079 to 0.013 in.
Allowable 1.25 mm
limit 0.0492 in.
W11466710
Factory 0.0900 to 0.120 mm
spec. 0.00355 to 0.00472 in.
Allowable 0.15 mm
limit 0.0059 in.
Factory 0.040 to 0.080 mm
spec. 0.0016 to 0.0031 in.
Allowable 0.15 mm
limit 0.0059 in.
W11485500
KiSC issued 03, 2011 A