5-30
E
POWR
CYLINDERS
SERVICE POINTS
Cylinder inspection
1. Eliminate:
• Carbon deposits
(using a rounded scraper
1
)
2. Check:
• Cylinder water jacket
Corrosion/mineral deposits
→
Clean or
replace.
• Cylinder inner surface
Score marks
→
Replace.
3. Measure:
• Cylinder bore “D”
(using a cylinder gauge)
Out of specification
→
Replace cylinder
and piston as a set.
NOTE:
Measure the cylinder bore parallel to and at a
right angle to the crankshaft. Then, average
the measurements.
Standard
Limit
Cylinder bore
“D”
84.000–
84.018 mm
(3.3071–
3.3078 in)
84.100 mm
(3.3110 in)
Taper “T”
—
0.080 mm
(0.0031 in)
Out of round
“R”
—
0.050 mm
(0.0020 in)
D = Maximum (D
1
–D
6
)
T = (Maximum D
1
or D
2
) – (Maximum D
5
or D
6
)
R = (Maximum D
1
, D
3
or D
5
) – (Minimum
D
2
, D
4
or D
6
)
