Yamaha F150A - Selecting the Crankpin Bearing

7-68
Crankcase
TIP:
In the third tightening stage for the connect-
ing rod bolts “1”, mark the connecting rod
bolts and the connecting rod cap with identifi-
cation marks “a”, and then tighten the bolts
90° from the marks on the connecting rod
cap.
6. Remove the connecting rod cap, and
then measure the width of the com-
pressed Plastigauge (PG-1) on the
crankpin.
Selecting the crankpin bearing
When replacing the crankpin bearing, select
the bearing as follows:
1. Measure the connecting rod big end
inside diameter “a”.
Example:
2. Check the crankpin mark “a” on the
crankshaft.
3. Select the suitable colors “1” for the
crankpin bearing from the “Crankpin
bearing selection table”.
Connecting rod bolt “1”:
1st: 13 N·m (1.3 kgf·m, 9.6 ft·lb)
2nd: 23 N·m (2.3 kgf·m, 17.0 ft·lb)
3rd: 90°
Big end oil clearance:
0.030–0.057 mm (0.0012–0.0022 in)
90˚
a
1
Connecting rod big end inside diameter
“a”:
53.025–53.045 mm
(2.0876–2.0884 in)
Connecting rod big
end inside diameter
“a”
Number in table
53.035
mm 35
a
P
J
P1
P2
P3
P4
a
P1 P4
P2 P3