Disassembling The Piston And Connecting Rod Assemblies; Checking The Piston Diameter - Yamaha F15B Service Manual

9. Remove the crankcase bolts in the
sequence shown.
0
2
1
9
6
5
8
3
7
4
NOTE:
Insert a flat-head screw driver between the
pry tabs to pry off the crankcase.
10. Remove the connecting rod bolts and the
piston assemblies.
NOTE:
Be sure to paint the alignment mark on the
connecting rods and caps, before remove the
connecting rods.
11. Remove the crankshaft, oil seals, dowel
pins and bearings.
6D45F11
9
1
2
10
5
6
7 4
8
3
6D451030
6D451040
Disassembling the piston and
connecting rod assemblies
1. Remove the clips 1 with pliers, and then
remove the piston pin 2.
2. Remove the top ring 3 2nd piston ring 4
and oil ring set 5.
1
2

Checking the piston diameter

1. Measure the piston outside diameter at
the specified measuring point. Replace if
out of specification.
Piston diameter a:
58.950–58.965 mm
(2.3209–2.3215 in)
Measuring point b:
5.0 mm (0.2 in) up from
the bottom of the piston skirt
Oversize piston diameter:
Oversize 1: 59.2 mm (2.33 in)
Oversize 2: 59.5 mm (2.34 in)
Cylinder block
1
2
3
4
3
5
1
6D451050
4
5
6
6D451060
7
8
9
5-38