Yamaha F150B, Service Manual

Page: 276 / 458

7-63
Power unit
POWR
TIP:
• After tightening the connecting rod cap
bolts, check that the crankshaft rotates
smoothly.
• Make sure that the mark
c
of the connect-
ing rod faces towards the flywheel magnet
side of the crankshaft.
12. Install the lower main bearings
o
and
new O-ring
p
into the crankcase.
13. Apply sealant to the mating surface of the
crankcase.
TIP:
• Install the main bearings in their original
positions.
• Do not get any sealant on the main bear-
ings.
14. Install the crankcase onto the cylinder
block.
15. Apply engine oil to the crankshaft bolts
q
and crankcase bolts
r
before
installation, and then tighten them to the
specified torques in 2 stages and in the
sequence numbers (
a
,
b
, · · ·). In the
2nd stage, make a mark
e
on the
crankcase and crankshaft bolts
q
, and
then tighten crankshaft bolts
q
90° from
the mark. NOTICE: Crankshaft bolts
q
a
–
d
can be reused 3 times.
TIP:
After tightening the crankcase bolts, check
that the crankshaft rotates smoothly.
o
o
p
Crankshaft bolt
q
a
–
d
(M10):
1st: 30 N·m (3.0 kgf·m, 22.1 ft·lb)
2nd: 90°
Crankcase bolt
r
e
–
n
(M8):
1st: 14 N·m (1.4 kgf·m, 10.3 ft·lb)
2nd: 26 N·m (2.6 kgf·m, 19.2 ft·lb)
90
r
q q
q
e
a b
c d
e f
g h
i j
k l
m n