Installing The Cylinder Head - Yamaha WR450FB 2012 Owner's Service Manual

EAS24230
INSTALLING THE CYLINDER HEAD
1. Install:
•Timing chain guide (exhaust side) "1"
• Dowel pin "2"
• Cylinder head gasket "3"
Dm
• Cylinder head "4"
TIP _ _ _ _ _ _ _ _ _ _ _ _ _ _
While pulling up the timing chain, install the tim-
ing chain guide (exhaust side) and cylinder
head.
2. Install:
•Washer "1"
•Bolt "2"
•Bolt "3"
4
TIP _ _ _ _ _ _ _ _ _ _ _ _ _ _
Tighten the bolts using the following procedure.
TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT
a. Wash the threads and contact surfaces of
the bolts, the contact surfaces of the plain
washers, the contact surface of the cylinder
head, and the threads of the crankcase.
b. Apply the molybdenum disulfide grease on
the threads and contact surfaces of the bolts
and on both contact surfaces of the plain "1"
- "4" washers.
c. Install the plain washers and bolts.
CYLINDER HEAD
d. Tighten the bolts to the spec.ified torque in
two or three steps in the proper tightening
sequence as shown.
~~
1
Bolts "1" - "4"
1st
30 Nm (3.0 m·kgf, 22 ft-lbf)
FWD
x2 II x4
if
e. Remove the bolts.
f. Again apply the molybdenum disulfide
grease on the threads and contact surfaces
of the bolts and on both contact surfaces of
the plain washers.
g. Retighten the bolts.
TIP~~~~~--~~--~--~~--~
Tighten the bolts to the specified torque in two
or three steps in the proper tightening se-
quence as shown.
6-16
~
Bolts "1" - "4"
2nd
20 Nm (2.0 m·kgf, 14 ft-lbf)
h. Put a mark on the corner "1" of the bolt (cyl-
inder head) and the cylinder head "2" as
shown.