4 - 21
ENG
CAMSHAFT AND CYLINDER HEAD
b. Removing the screwdriver and slowly
release the timing chain tensioner rod.
c. Make sure that the timing chain tensioner
rod comes out of the timing chain tensioner
housing smoothly. If there is rough move-
ment, replace the timing chain tensioner.
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CHECKING THE CYLINDER HEAD
1. Eliminate:
• carbon deposits (from the combustion
chamber)
Use a rounded scraper.
NOTE:
Do not use a sharp instrument to avoid damag-
ing or scratching:
• spark plug threads
• valve seats
2. Check:
• cylinder head
Scratches/damage
→
Replace the cylinder
head cover and cylinder head as a set.
• cylinder head water jacket
Mineral deposits/rust
→
Eliminate.
3. Measure:
• cylinder head warpage
Out of specification
→
Resurface.
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a. Place a straightedge and a thickness gauge
across the cylinder head.
b. Use a thickness gauge to measure the
warpage.
c. If the warpage is out of specification, resur-
face the cylinder head.
Cylinder head warpage
Less than 0.03 mm (0.0012 in)
Summary of Contents for 2004 Rhino 660 YXR660FAS
Page 1: ...LIT 11616 17 23 5UG F8197 10 YXR660FAS SERVICE MANUAL ...
Page 6: ......
Page 40: ...2 11 SPEC ENGINE SPECIFICATIONS Cylinder head tightening sequence ...
Page 55: ...2 26 SPEC COOLANT FLOW DIAGRAMS 1 Coolant outlet hose 2 Radiator inlet pipe 2 1 ...
Page 383: ...9 31 ELEC LIGHTING SYSTEM ...
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Page 420: ...YAMAHA MOTOR CO LTD 2500 SHINGAI IWATA SHIZUOKA JAPAN PRINTED IN U S A ...