OC60-E2, OC95-E2, WSM
ENGINE
S-46
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.
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.
Piston ring
gap
Top ring
Factory
spec.
OC60-E2
0.15 to 0.30 mm
0.0059 to 0.0118 in.
OC95-E2
Allowable
limit
OC60-E2
1.2 mm
0.0472 in.
OC95-E2
Second
ring
Factory
spec.
OC60-E2
0.25 to 0.45 mm
0.0098 to 0.0177 in.
OC95-E2
0.30 to 0.50 mm
0.0118 to 0.0197 in.
Allowable
limit
OC60-E2
1.2 mm
0.0472 in.
OC95-E2
Oil ring
Factory
spec.
OC60-E2
0.25 to 0.40 mm
0.0098 to 0.0157 in.
Allowable
limit
OC95-E2
1.2 mm
0.0472 in.
0000009277E
a
Factory spec.
More than 0.2 mm
Clearance
between
piston ring
and piston
ring groove
Factory
spec.
Second
ring
OC60-E2
0.030 to 0.065 mm
0.0013 to 0.0026 in.
OC95-E2
0.045 to 0.080 mm
0.0018 to 0.0031 in.
Oil ring
OC60-E2
OC95-E2
0.020 to 0.055 mm
0.0008 to 0.0022 in.
Allowable
limit
Second
ring
OC60-E2
OC95-E2
0.15 mm
0.0059 in.
Oil ring
OC60-E2
OC95-E2
0.15 mm
0.0059 in.
(A)
Top Ring (Key Stone Type)
(B)
Second, Oil Ring
0000009281E
