Checking The Timing Chain Guides - Yamaha 2007 XP500 Service Manual

4. Measure:
Camshaft-journal-to-camshaft-cap clearance
G
Out of specification → Measure the camshaft
journal diameter.
Camshaft-journal-to-cam-
shaft-cap clearance
0.020–0.054 mm (0.0008–0.0021
in)
MMMMMMMMMMMMMMMMMMMMMM
a. Install the camshaft into the cylinder head
(without the dowel pins and camshaft caps).
b. Position "a" strip of Plastigauge® "1" onto the
camshaft journal as shown.
c. Install the dowel pins and camshaft caps.
NOTE:
Tighten the camshaft cap bolts in stages and in
G
a crisscross pattern, working from the inner
caps out.
Do not turn the camshaft when measuring the
G
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".
LLLLLLLLLLLLLLLLLLLLLL
5. Measure:
Camshaft journal diameter "a"
G
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)
EAS23950

CHECKING THE TIMING CHAIN GUIDES

The following procedure applies to all of the
camshaft sprockets and timing chain guides.
1. Check:
Camshaft sprocket
G
More than 1/4 tooth wear "a"→ Replace the
camshaft sprockets and the timing chain as a
set.
5-10
CAMSHAFTS