Yamaha F150B, Service Manual

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7-62
Crankcase
0
1
2
3
4
5
6
7
8
9
10
A
8. Install the lower main bearings
l
into the
main bearing cap
m
.
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.
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.
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 connecting rod bolts before
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.
Main bearing cap bolt:
1st: 30 N·m (3.0 kgf·m, 22.1 ft·lb)
2nd: 90°
l
l
l
m
90
a b
c d
e f
b
Piston ring compressor
n
:
90890-05158
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
90
d
f
c