Removing The Camshaft And Cylinder Head; Checking The Camshaft - Yamaha 2004 Rhino 660 YXR660FAS Service Manual

CAMSHAFT AND CYLINDER HEAD
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REMOVING THE CAMSHAFT AND
CYLINDER HEAD
1. Loosen:
• camshaft sprocket bolts 1
2. Loosen:
• timing chain tensioner cap bolt
3. Remove:
• timing chain tensioner
• timing chain guide (exhaust side)
• decompressor cam guide plates
• camshaft sprocket
• camshaft
NOTE:
• Fasten a safety wire to the timing chain to
prevent it from falling into the crankcase.
• When removing the camshaft sprocket, it is
not necessary to separate the timing chain.
4. Remove:
• cylinder head
NOTE:
• Loosen the bolts in the proper sequence.
• Follow the numerical order shown in the illus-
tration. Loosen each bolt 1/4 of a turn at a
time until all of the bolts are loose.

CHECKING THE CAMSHAFT

1. Check:
• cam lobes
Pitting/scratches/blue discoloration →
Replace.
2. Measure:
• cam lobe dimensions a and b
Out of specification → Replace.
Camshaft lobe limit
Intake
a 35.59 mm (1.4012 in)
b 29.96 mm (1.1795 in)
Exhaust
a 36.40 mm (1.4331 in)
b 30.01 mm (1.1815 in)
ENG