Checking The Camshaft Sprockets; Checking The Timing Chain Guides - Yamaha 2009 XP500Y TMAX Service Manual

c. Install the dowel pins and camshaft caps.
TIP
• Tighten the camshaft cap bolts in stages and in
a crisscross pattern, working from the inner
caps out.
• Do not turn the camshaft when measuring the
camshaft journal-to-camshaft cap clearance
with the Plastigauge®.
Camshaft cap bolt
10 Nm (1.0 m·kg, 7.2 ft·lb)
d. Remove the camshaft caps and then mea-
sure the width of the Plastigauge® "1".
L LLL L LLL L L LLL L L LLL L
5. Measure:
• Camshaft journal diameter "a"
Out of specification → Replace the camshaft.
Within specification → Replace the cylinder
head and the camshaft caps as a set.
Camshaft journal diameter
22.967–22.980 mm (0.9042–
0.9047 in)
L LLL L L LLL L LLL
5-11
EAS4B51035

CHECKING THE CAMSHAFT SPROCKETS

The following procedure applies to both of the
camshaft sprockets.
1. Check:
• Camshaft sprocket
More than 1/4 tooth wear "a" → Replace the
camshafts and the timing chain as a set.
a. 1/4 tooth
b. Correct
1. Timing chain roller
2. Camshaft sprocket
EAS23950

CHECKING THE TIMING CHAIN GUIDES

1. Check:
• Timing chain guide (intake side) "1"
• Timing chain guide (exhaust side) "2"
• Timing chain guide (upper side) "3"
Damage/wear → Replace the defective
part(s).
CAMSHAFTS