Selecting The Main Bearing - Yamaha F150B Service Manual

Crankshaft main journal oil clearance:
0.021–0.050 mm (0.0008–0.0020 in)
TIP:
When loosening the main bearing bolts and
crankcase bolts, loosen them in the opposite
order used for tightening.

Selecting the main bearing

1. When replacing the main bearing, select
the suitable bearing as follows.
2. Check the crankshaft journal mark a on
the crankshaft and the cylinder block
mark b on the cylinder block.
J1 J2
J2 J3
J1
a
J5 J4 J3
J3 J4 J5
J4
J5
J2 J1 b
3. Select the suitable color c for the main
bearing from the table.
Cylinder block mark b
20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38
80
81
82
83
84
85
86
87
88
89
90
91
f
92
93
94
e
95
96
97
d
98
99
00
Upper bearing
color
d
Green
e
Green
f
Red
g
Red
h
Yellow
i
Yellow
Example:
If the crankshaft journal mark a is "89" and
the cylinder block mark b is "28," and then
select the bearing colors in "g."
TIP:
J3 is a thrust bearing.
Crankcase
c
c
i
h
g
Lower bearing
color
Green
Red
Red
Yellow
Yellow
Blue + Green
10
7-60
0
1
2
3
4
5
6
7
8
9
A