3-38
PISTON, CONNECTING ROD, CRANKSHAFT AND
CRANKCASE
a
1
PISTON RING INSPECTION
1. Measure:
9
Piston ring end gap
Out of specification
→
Replace.
NOTE:
Insert the piston ring
1
into the cylinder, and
push it approximately
a
5 mm (0.2 in) into the
cylinder. Push the ring with the piston crown
so that the ring is at angles to the cylinder
bore.
Out of specifications
→
Replace the
piston and piston ring as a set.
2. Measure:
9
Piston side clearance
Out of specification
→
Replace.
Use a thickness gauge
1
.
NOTE:
9
Clean carbon deposits from the piston ring
grooves and rings before measuring the
side clearance.
9
Measure the side clearance at several por-
tions.
ENG
Top ring
Wear limit
Ring end gap
0.9 mm
(0.0354 in)
0.2 ~ 0.4 mm
(0.008 ~ 0.016 in)
2nd ring
0.9 mm
(0.0354 in)
0.2 ~ 0.4 mm
(0.008 ~ 0.016 in)
Oil ring
0.9 mm
(0.0354 in)
0.2 ~ 0.4 mm
(0.008 ~ 0016 in)
Top ring
Wear limit
Piston ring side
clearance
0.1 mm
(0.0039 in)
0.04 ~ 0.08 mm
(0.0016 ~
0.0031 in)
2nd ring
0.02 ~ 0.06 mm
(0.0008 ~
0.0024 in)
7CF7E0-03 05.7.3 15:14 Page 38
