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CYLINDER HEAD AND CYLINDER
SDN5150
SDN5160
SDN5170
SDN5180
5-11
7. Eliminate:
•
Score marks and lacquer deposits
(from the piston wall)
Use 600 ~ 800 grit wet sandpaper.
NOTE:
Sand in a crisscross pattern. Do not sand exces-
sively.
8. Measure:
•
Piston-to-cylinder clearance
Measurement steps:
1st step:
•
Measure the cylinder bore (C) with a cylinder
bore gauge 1.
NOTE:
Measure the cylinder bore (C) parallel to and at
right angles to the crankshaft. Then find the aver-
age of the measurements.
Standard
Cylinder bore
69.000 ~ 69.014 mm
(2.7165 ~ 2.7171 in)
(C)
Taper (T)
Out of round
(R)
C = Maximum D
T = (Maximum of D
or D
1
(Maximum of D
or D
5
R = (Maximum of D
, D
1
(Minimum of D
, D
2
•
If out of specification, replace cylinder, and
replace piston and piston rings as a set.
2nd step:
•
Measure the piston skirt diameter (P) with a
micrometer.
a 10 mm (0.39 in) from the bottom edge of the piston
ENG
Wear limit
69.100 mm
(2.7205 in)
0.05 mm
–
(0.002 in)
0.01 mm
–
(0.0004 in)
) –
2
)
6
or D
) –
3
5
or D
)
4
6
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