Yamaha F90D - Page 100

6D81G11
5-34
1
2
3
4
5
6
7
8
9
CAUTION:
Do not reuse the cylinder head gasket,
always replace it with a new one.
NOTE:
• Apply engine oil to the cylinder head bolts
before installation.
• Tighten the M10 bolts to the specified
torques in two stages first, and then tighten
the M8 bolts to 14 N·m (1.4 kgf·m, 10.3
ft·lb).
• Make a mark
a
on the M10 bolts and the
cylinder head, and then tighten the bolts
90° from the mark.
• Tighten the M8 bolts to 28 N·m (2.8 kgf·m,
20.7 ft·lb).
3. Install the valve shims and valve lifters.
NOTE:
• Apply engine oil to the valve shims and
valve lifters before installation.
• Install the valve shims and valve lifters in
their original positions.
4. Install the camshaft (intake)
1
and cam-
shaft (exhaust)
2
with the new oil seals
3
.
NOTE:
• Apply molybdenum disulfide grease to the
cam lobes.
• Be sure to install the camshaft with the fuel
pump drive cam
b
on the intake side.
5. Check that the camshaft dowel holes
c
are in the position shown in the illustra-
tion. Adjust if necessary.
T
R
.
.
Cylinder head bolt (M10):
1st: 15 N·m (1.5 kgf·m, 11.1 ft·lb)
2nd: 30 N·m (3.0 kgf·m, 22.1 ft·lb)
3rd: 90°
Cylinder head bolt (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)
S6D85480
90˚
a
E
S6D85490
MM
MM
E
E
E
2
1
3
b
S1280B
S6D85500
c
Cylinder head