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ENG
5-34
CYLINDER AND PISTON
EAS00255
CHECKING THE CYLINDER AND PISTON
1. Check:
8piston wall
8cylinder wall
Vertical scratches J Rebore or replace
the cylinder, and replace the piston and
piston rings as a set.
2. Measure:
8piston-to-cylinder clearance
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Measure cylinder bore “C” with the cylinder
bore gauge.
TIP
Measure cylinder bore “C” by taking side-to-side
and front-to-back measurements of the cylinder.
Then, find the average of the measurements.
b. If out of specification, rebore or replace the
cylinder, and replace the piston and piston
rings as a set.
c. Measure piston skirt diameter “P” with the
micrometer.
a 7mm (0.28in) from the bottom edge of the
piston
d. If out of specification, replace the piston and
piston rings as a set.
a
P
52.40 ~ 52.41mm
(2.0630~2.0634in)
0.05mm (0.002in)
0.05mm (0.002in)
Taper limit “T”
Out-of-round “R”
“C” = maximum of D
1
~ D
2
“T” = maximum of D
1
or D
2
- maximum of D
5
or D
6
“R” = maximum of D
1
, D
3
or D
5
- minimum of D
2
, D
4
or D
6
Cylinder bore “C”
Piston size “P”
52.375 ~ 52.390mm
(2.0620 ~ 2.0626in)
Standard
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