Checking The Timing Chain, Camshaft Sprockets; And Timing Chain Guides; Checking The Timing Chain Tensioner - Yamaha VMX12 2001 Service Manual

CAMSHAFTS
EAS00208
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 timing
chain and camshaft sprockets as a set.
2. Check:
• camshaft sprocket
More than 1/4 tooth wear a → Replace the
camshaft sprockets and the timing chain as
a set.
a 1/4 tooth
b Correct
1 Timing chain roller
2 Camshaft sprocket
3. Check:
• timing chain guide (exhaust side)
• timing chain guide (top side)
Damage/wear → Replace the defective
part(s).
EAS00210
CHECKING THE TIMING CHAIN
TENSIONER
1. Check:
• timing chain tensioner
Cracks/damage → Replace.
• one-way cam operation
Rough movement → Replace the timing
chain tensioner housing.
2. Check:
• cap bolt
• copper washer
• spring
• one-way cam
• gasket
• timing chain tensioner rod
Damage/wear → Replace the defective
part(s).
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