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ENG
CONNECTING RODS AND PISTONS
EAS00263
CHECKING THE PISTON RINGS
1. Measure:
• piston ring side clearance
Out of specification
→
Replace the piston
and piston rings as a set.
NOTE:
_
Before measuring the piston ring side clear-
ance, eliminate any carbon deposits from the
piston ring grooves and piston rings.
2. Install:
• piston ring
(into the cylinder)
NOTE:
_
Level the piston ring into the cylinder with the
piston crown.
a
5 mm (0.20 in)
3. Measure:
• piston ring end gap
Out of specification
→
Replace the piston
ring.
NOTE:
_
The oil ring expander spacer’s end gap cannot
be measured. If the oil ring rail’s gap is exces-
sive, replace all three piston rings.
Piston ring side clearance
Top ring
0.030 ~ 0.065 mm
(0.0012 ~ 0.0026 in)
<Limit>: 0.115 mm (0.0045 in)
2nd ring
0.020 ~ 0.055 mm
(0.0008 ~ 0.0022 in)
<Limit>: 0.115 mm (0.0045 in)
Piston ring end gap
Top ring
0.32 ~ 0.44 mm
(0.013 ~ 0.017 in)
<Limit>: 0.69 mm (0.027 in)
2nd ring
0.43 ~ 0.58 mm
(0.017 ~ 0.023 in)
<Limit>: 0.93 mm (0.037 in)
Oil ring
0.10 ~ 0.35 mm
(0.0039 ~ 0.0138 in)