Yamaha 2004 Rhino 660 YXR660FAS, Service Manual

Page: 141 / 421

4 - 11
ENG
CYLINDER HEAD COVER
REMOVING THE CYLINDER HEAD COVER
1. Align:
• “I” mark
(with stationary pointer)
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a. Turn the crankshaft counterclockwise with a
wrench.
b. Align the “I” mark
1
on the rotor with the
stationary pointer
2
on the A.C. magneto
cover. When the “I” mark is aligned with the
stationary pointer, the piston is at the Top
Dead Center (TDC).
NOTE:
• When the piston is at the top dead center
(TDC) on the compression stroke, there
should be clearance between the valve stem
tips and their respective rocker arm adjusting
screws.
• If there is no clearance, rotate the crankshaft
counterclockwise one turn.
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2. Remove:
• cylinder head cover
NOTE:
Loosen each bolt 1/4 of a turn at a time, in
stages and in a crisscross pattern. After all the
bolts are loosened, remove them.
2
1
CHECKING THE CYLINDER HEAD COVER
1. Check:
• cylinder head cover
Cracks/damage
→
Replace the cylinder
head cover and cylinder head as a set.
CHECKING THE TAPPET COVERS
1. Check:
• tappet cover (intake)
1
• tappet cover (exhaust)
2
Cracks/damage
→
Replace.
• O-rings
3
New