4-21
ENG
CYLINDER HEAD, CYLINDER AND PISTON
EC474302
Piston
1. Eliminate:
9
Carbon deposits
From the piston crown
a
and ring groove
b
.
2. Inspect:
9
Piston wall
Score marks
→
Repair or replace.
3. Measure:
9
Piston skirt diameter
Use micrometer
1
.
Measure the specific distance
a
from the
bottom edge.
Out of specification
→
Replace.
2. Inspect:
9
Cylinder inner surface
Score marks
→
Repair or replace.
Use #400~600 grit wet sandpaper.
c
C
Do not rebore the cylinder.
3. Measure:
9
Cylinder bore “C”
Use cylinder gauge
1
.
Out of limit
→
Replace.
NOTE:
Measure the cylinder bore “C” in parallel (A, B,
C) to and at right angles to the crankshaft (a, b).
Then, find the average of the measurements.
17.5 mm
53.957~53.972 mm
(0.69 in)
(2.1243~2.1249 in)
Standard
Wear limit
Cylinder
54.000~54.014mm 54.1
mm
bore “C”
(2.1260~2.1265 in)
(2.130 in)
Taper “T”
—
0.05 mm
(0.0020 in)
C=Maximum Aa~Cb
T=(Maximum Aa, or Ab) —
(Maximum Ba, or Bb)
Distance
a
a
Piston dia.
1C3-9-32-4B 4/6/06 2:10 PM Page 8
