Checking The Timing Chain, Camshaft Sprockets, And Timing Chain Guides - Yamaha YZF-R7 Owner's Service Manual

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CAMSHAFTS
a. Install the camshaft into the cylinder
head (without the dowel pins and
camshaft caps).
b. Position a strip of Plastigauge
onto the camshaft journal as shown.
c. Install the dowel pins and camshaft
caps.
NOTE:
• Tighten the camshaft cap bolts in
stages and in a crisscross pattern,
working from the inner caps out.
• Do not turn the camshaft when mea-
suring the camshaft journal-to-cam-
shaft cap
®
Plastigauge
Camshaft cap bolt
10 Nm (1.0 m • kg, 7.2 ft • lb)
d. Remove the camshaft caps and then
measure the width of the Plasti-
®
gauge 1.
5. Measure:
• camshaft journal diameter a
Out of specification → Replace the
camshaft.
Within specification → Replace the cylin-
der head and the camshaft caps as a set.
Camshaft journal diameter
24.452 ~ 24.465 mm
(0.9627 ~ 0.9632 in)
EB401421
CHECKING THE TIMING CHAIN,
CAMSHAFT SPROCKETS, AND TIMING
CHAIN GUIDES
The following procedure applies to all of
the camshaft sprockets and timing chain
guides.
1. Check:
• timing chain
Damage/stiffness → Replace the tim-
ing chain and camshaft sprockets as a
set.
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ENG
®
clearance with
.
1
the