Yamaha F225F, Service Manual

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7-80
Cylinder block
0
1
2
3
4
5
6
7
8
9
10
A
TIP:
When measuring the piston pin boss inside
diameter, do not measure it at the ring groove
b
or oil groove
c
.
Checking the piston pin diameter
1. Measure the piston pin diameter
a
.
Checking the connecting rod small
end inside diameter and big end
inside diameter
1. Tighten the bolts
a
to the specified
torques in 2 stages.
2. Measure the connecting rod small end
inside diameter
a
and big end inside
diameter
b
.
TIP:
• When checking the oil clearance, reuse the
removed connecting rod bolt.
• In the second tightening stage for the con-
necting rod bolts
a
, mark the connecting
rod bolts and the connecting rod cap with
identification marks
c
, and then tighten the
bolts 90° from the marks on the connecting
rod cap.
Checking the connecting rod big end
side clearance
1. Measure the connecting rod big end side
clearance
a
.
Piston pin boss inside diameter
a
:
22.011–22.018 mm
(0.8666–0.8668 in)
Piston pin outside diameter
a
:
21.996–22.005 mm
(0.8660–0.8663 in)
a
b
c c
a
Connecting rod small end inside
diameter
a
:
22.010–22.024 mm
(0.8665–0.8671 in)
Connecting rod big end inside diameter
b
:
55.990–56.010 mm
(2.2043–2.2051 in)
Connecting rod bolt
a
:
1st: 40 N·m (4.0 kgf·m, 29.5 ft·lb)
2nd: 90°
a
b
c
a
90˚