Yamaha YZ450FA Automobile User Manual


 
4-18
CAMSHAFTS
d. Install the clips, camshaft caps "4" and bolts
(camshaft cap) "5".
• Before installing the clips, cover the cylinder
head with a clean rag to prevent the clips from
into the cylinder head cavity.
Tighten the bolts to the specified torque in two
or three steps in the proper tightening se-
quence as shown.
The bolts (camshaft cap) must be tightened
evenly, or damage to the cylinder head,
camshaft caps, and camshaft will result.
2. Install:
• Timing chain tensioner
Installation steps:
a. While pressing the tensioner rod lightly with
fingers, use a thin screwdriver and wind the
tensioner rod up fully clockwise.
b. With the rod fully wound and the chain ten-
sioner UP mark "a" facing upward, install the
gasket "1", the timing chain tensioner "2",
and the gasket "3", and tighten the bolt "4" to
the specified torque.
c. Release the screwdriver, check the tension-
er rod to come out and tighten the gasket "5"
and the cap bolt "6" to the specified torque.
3. Turn:
• Crankshaft
Counterclockwise several turns.
4. Check:
• Alignment mark
Align with the crankcase align mark.
• Camshaft match marks
Align with the cylinder head surface.
Out of alignment Adjust.
Bolt (camshaft cap):
10 Nm (1.0 m•kg, 7.2 ft•lb)
Bolt (timing chain tensioner):
10 Nm (1.0 m•kg, 7.2 ft•lb)
Tensioner cap bolt:
7 Nm (0.7 m•kg, 5.1 ft•lb)