Yamaha F150B, Service Manual

Page: 257 / 458

7-44
Cylinder head
0
1
2
3
4
5
6
7
8
9
10
A
TIP:
The valve spring can be installed in any
direction.
3. Compress the valve spring, and then
install the valve cotters
g
.
4. Lightly tap the valve spring retainer with a
plastic hammer to set the valve cotters
g
securely.
Installing the cylinder head
1. Install a new gasket and the cylinder
head, and then tighten the bolts to the
specified torques in the sequence num-
bers (
a
,
b
, · · ·). Apply engine oil to the
cylinder head bolts before installation.
NOTICE: Do not reuse the cylinder
head gasket, always replace it with a
new one.
TIP:
Tighten the M10 bolts to the specified
torques in 2 stages first, and then make a
mark
a
on the M10 bolts and the cylinder
head, and then tighten the bolts 90° from the
mark.
2. Install the camshafts, driven sprockets,
and timing belt. See “Installing the timing
belt, driven sprocket, and camshaft” (7-
30).
g
g
g
Cylinder head bolt
a
–
j
(M10):
1st: 19 N·m (1.9 kgf·m, 14.0 ft·lb)
2nd: 37 N·m (3.7 kgf·m, 27.3 ft·lb)
3rd: 90°
Cylinder head bolt
k
–
t
(M8):
1st: 14 N·m (1.4 kgf·m, 10.3 ft·lb)
2nd: 28 N·m (2.8 kgf·m, 20.7 ft·lb)
a
90
a b
c d
e
f
g
h
i
j
k
l
m
n
o
p
q
r s t