Yamaha F150B Service Manual page 275

8. Install the lower main bearings l into the
main bearing cap m.
m
l
l
TIP:
Install the main bearings in their original posi-
tions.
9. Install the main bearing cap, and then
tighten the main bearing cap bolts to the
specified torques in 2 stages and in the
sequence numbers (a, b, · · ·). Apply
engine oil to the main bearing cap bolts
before installation. In the 2nd stage,
make a mark b on the main bearing
caps and main bearing cap bolts, and
then tighten the main bearing cap bolts
90° from the mark. NOTICE: Main
bearing cap bolts a–f can be reused
3 times.
90
b
e
a
d
Main bearing cap bolt:
1st: 30 N·m (3.0 kgf·m, 22.1 ft·lb)
2nd: 90°
10. Install the piston with the "UP" mark on
the piston crown facing towards the
flywheel magnet. Apply engine oil to the
side of the pistons and piston rings
before installation.
l
Piston ring compressor n:
90890-05158
11. Install the connecting rod caps f to the
connecting rods, and then tighten the
connecting rod bolts to the specified
torques in 3 stages. Apply engine oil to
the
installation. Make sure that the mark c
of the connecting rod faces towards the
flywheel side of crankshaft. In the 3rd
stage, make a mark d on the connecting
rod bolts. NOTICE: Do not reuse the
connecting rod bolts, always replace
them with new ones.
f
b
d
c
Connecting rod bolt:
1st: 23 N·m (2.3 kgf·m, 17.0 ft·lb)
2nd: 43 N·m (4.3 kgf·m, 31.7 ft·lb)
3rd: 90°
n
connecting rod
c
90
f
Crankcase
0
1
2
3
4
5
bolts before
6
7
8
9
10
A
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