Yamaha F150B - Checking the Crankshaft Journal Oil Clearance

7-58
Crankcase
0
1
2
3
4
5
6
7
8
9
10
A
4. Select the suitable color c for the
connecting rod bearing from the table.
Example:
If the connecting rod big end inside diameter
a is “35” and the crankpin mark b is “81,”
and then select the bearing colors in “g.”
Checking the crankshaft journal oil
clearance
1. Clean the bearings, crankshaft journals,
crankcase, cylinder block, and main
bearing cap.
2. Place the cylinder block upside down on
a bench.
3. Install half of the main bearings a and
the crankshaft b into the cylinder block
c.
TIP:
Install the main bearings in their original posi-
tions.
4. Put a piece of Plastigauge (PG-1) onto
the crankshaft journals, parallel to the
crankshaft.
b
P1
P2
P3
P4
P1
P2
P3
P4
c
c
Connecting rod big end inside
diameter a
d
e
f
g
h
Crankpin mark b
25
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
00
26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45
Upper bearing
color
Lower bearing
color
d Green Green
e Green Blue
f Blue Blue
g Blue Red
h Red Red
a
b
c