Checking The Piston Pin Boss Inside Diameter; Checking The Piston Pin Diameter; Checking The Connecting Rod Small End Inside Diameter And Big End Inside Diameter - Yamaha F30B 2018 Service Manual

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".
b
c
c
Pin boss inside diameter
15.974–15.985
0.6293 in)
Limit
16.005 mm (0.6301 in)

Checking the piston pin diameter

1. Measure:
• Piston pin outside diameter
Below specification  Replace.
Pin outside diameter
15.965–15.970
0.6287 in)
Limit
15.955 mm (0.6281 in)
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Measure the piston pin outside diameter
"a" at measuring points "b", "c", and "d",
and in directions "e" and "f".
a
mm (0.6289–
mm (0.6285–
7-54
a
b
c
d
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
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.
Small end inside diameter
15.985–15.998
0.6298 in)
Big end inside diameter
36.000–36.024
1.4183 in)
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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.
Cylinder block
e
f
mm (0.6293–
mm (1.4173–