Crankcase
7-51
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.
a. Measure the piston pin outside diame-
ter “a” at measuring points “b”, “c”, and
“d”,
and in directions “e” and “f”.
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.
a. Tighten the connecting rod bolts “1” to
the specified torques
in 2 stages.
• When checking the big end inside diameter,
reuse the removed connecting rod bolts.
• In the second tightening stage for the con-
necting rod bolts “1”, mark the connecting rod
bolts and
the connecting rod cap with identi-
fication marks “a”, and then tighten the bolts
60 fro
m the marks on the connecting rod
cap.
Pin boss inside diameter
18.004–18.015 mm (0.7088–
0.7093 in)
Limit
18.035 mm (0.7100 in)
Pin outside diameter
17.991–18.000 mm (0.7083–
0.7087 in)
Limit
17.981 mm (0.7079 in)
a
b
c
c
Small end inside diameter
18.005–18.018 mm (0.7089–
0.7094 in)
Big end inside diameter
50.025–50.045 mm (1.9695–
1.9703 in)
a
b
e
f
c
d
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