Kubota WSM OC60-E2 Workshop Manual page 98

OC60-E2, OC95-E2, WSM
Piston Ring Gap
1. Insert the piston ring into the cylinder and push down to the
bottom, where the wear is least, with a piston head.
2. Measure the ring gap with a thickness gauge.
3. If the ring gap exceeds the allowable limit, replace the ring.
Factory
spec.
Top ring
Allowable
limit
Factory
Piston ring spec.
Second
gap
ring
Allowable
limit
Factory
spec.
Oil ring
Allowable
limit
Clearance between Piston Ring and Piston Ring Groove
1. Remove carbon from the ring grooves.
2. Measure the clearance between the ring and the groove with
a thickness 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.
a Factory spec.
Second
ring
Factory
spec.
Clearance
between
Oil ring
piston ring
and piston
ring groove
Second
ring
Allowable
limit
Oil ring
(A) Top Ring (Key Stone Type)
S-46
OC60-E2
0.15 to 0.30 mm
0.0059 to 0.0118 in.
OC95-E2
OC60-E2
1.2 mm
0.0472 in.
OC95-E2
0.25 to 0.45 mm
OC60-E2
0.0098 to 0.0177 in.
0.30 to 0.50 mm
OC95-E2
0.0118 to 0.0197 in.
OC60-E2
1.2 mm
0.0472 in.
OC95-E2
0.25 to 0.40 mm
OC60-E2
0.0098 to 0.0157 in.
1.2 mm
OC95-E2
0.0472 in.
0000009277E
More than 0.2 mm
0.030 to 0.065 mm
OC60-E2
0.0013 to 0.0026 in.
0.045 to 0.080 mm
OC95-E2
0.0018 to 0.0031 in.
OC60-E2 0.020 to 0.055 mm
OC95-E2 0.0008 to 0.0022 in.
OC60-E2 0.15 mm
OC95-E2 0.0059 in.
OC60-E2 0.15 mm
OC95-E2 0.0059 in.
(B) Second, Oil Ring
0000009281E
ENGINE