Yamaha F30B 2018, Руководство по обслуживанию

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7-54
Cylinder block
Checking the piston pin boss inside
diameter
1. Measure:
• Piston pin boss inside diameter “a”
Above specification

Replace.
TIP:
When measuring the piston pin boss inside di-
ameter, do not measure it at the ring groove “b”
or oil groove “c”.
Checking the piston pin diameter
1. Measure:
• Piston pin outside diameter
Below specification

Replace.
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a. Measure the piston pin outside diameter
“a” at measuring points “b”, “c”, and “d”,
and in directions “e” and “f”.
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Checking the connecting rod small
end inside diameter and big end in-
side diameter
1. Measure:
• Connecting rod small end inside diameter
and big end inside diameter
Above specification

Replace.
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a. Tighten the connecting rod bolts “1” to the
specified torques in 2 stages.
TIP:
When checking the big end inside diameter, re-
use the removed connecting rod bolts.
Pin boss inside diameter
15.974–15.985 mm (0.6289–
0.6293 in)
Limit
16.005 mm (0.6301 in)
Pin outside diameter
15.965–15.970 mm (0.6285–
0.6287 in)
Limit
15.955 mm (0.6281 in)
a
b
c
c
Small end inside diameter
15.985–15.998 mm (0.6293–
0.6298 in)
Big end inside diameter
36.000–36.024 mm (1.4173–
1.4183 in)
a
b
e
f
c
d