Yamaha F225F, Service Manual

Page: 361 / 576

7-78
Cylinder block
0
1
2
3
4
5
6
7
8
9
10
A
5. Remove the piston pin clips
l
and piston
pin
m
, and then remove the connecting
rod
f
.
TIP:
• Remove the piston pin from the side
marked with
g
.
• Make sure to keep the parts in the order of
removal.
6. Remove the piston rings.
Checking the piston diameter
1. Measure the piston diameter
a
at the
specified measuring point
b
.
Checking the cylinder bore
1. Measure the cylinder bore (D
1
–D
6
) at
measuring points
a
,
b
, and
c
, and in
direction
d
(D
1
, D
3
, D
5
), which is parallel
to the crankshaft, and direction
e
(D
2
,
D
4
, D
6
), which is at a right angle to the
crankshaft.
a
10.0 mm (0.39 in)
b
77.0 mm (3.03 in)
c
106.0 mm (4.17 in)
Checking the piston ring
1. Measure piston ring dimensions B and T.
Bearing splitter plate
i
:
(commercially available)
Gear puller
j
: (commercially available)
General cylindrical tool
k
:
d
= 19 mm (0.7 in)
e
= 90 mm (3.5 in)
l
l
m
f
g
b
a
Piston diameter
a
:
95.945–95.960 mm
(3.7774–3.7779 in)
Measuring point
b
:
13.500 mm (0.5315 in) up from the
bottom of the piston skirt
Cylinder bore (D
1
–D
6
):
96.000–96.012 mm
(3.7795–3.7800 in)
a
b
c
d
e
D
1
D
2
D
3
D
4
D
5
D
6
c
b
a
B
T
T
B
T
B