Checking The Timing Chain, Camshaft Sprockets, And Timing Chain Guides; Checking The Timing Chain Tensioner - Yamaha YZFR6X(C) 2008 Service Manual

Camshaft cap bolt
10 Nm (1.0 m·kg, 7.4 ft·lb)
d. Remove the camshaft caps and then mea-
sure the width of the Plastigauge
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
5. Measure:
• Camshaft journal diameter "a"
Out of specification → Replace the cam-
shaft.
Within specification → Replace the cylin-
der head and the camshaft caps as a set.
Camshaft journal diameter
22.459–22.472 mm (0.8842–
0.8847 in)
EAS23870
CHECKING THE TIMING CHAIN, CAM-
SHAFT SPROCKETS, AND TIMING CHAIN
GUIDES
1. Check:
• Timing chain "1"
Damage/stiffness → Replace the timing
chain and camshaft and camshaft
sprocket as a set.
2. Check:
• Camshaft sprocket
More than 1/4 tooth wear "a" → Replace
the camshaft sprocket and the timing
chain as a set.
®
"1".
a. 1/4 tooth
b. Correct
1. Timing chain roller
2. Camshaft sprocket
3. Check:
• Timing chain guide (exhaust side)
• Timing chain guide (intake side)
• Timing chain guide (upper side)
Damage/wear → Replace the defective
part(s).
EAS23970
CHECKING THE TIMING CHAIN TEN-
SIONER
1. Remove:
• Timing chain tensioner rod "1"
• Timing chain tensioner spring seat "2"
• Timing chain tensioner inner spring "3"
• Timing chain tensioner outer spring "5"
• Timing chain tensioner housing "6"
NOTE:
Squeeze the timing chain tensioner clip "4",
and then remove the timing chain tensioner
springs and timing chain tensioner rod.
1
2. Check:
• Timing chain tensioner housing
• Timing chain tensioner rod
• Timing chain tensioner spring seat
• Timing chain tensioner springs
Damage/wear → Replace the as a set.
3. Assemble:
• Timing chain tensioner springs
• Timing chain tensioner spring seat
• Timing chain tensioner rod
5-11
CAMSHAFTS
6
2 3 5
4