Yamaha XT660R(S) Automobile User Manual


 
5 - 12
ENG
CYLINDER HEAD
EAS00212
CHECKING THE TAPPET COVERS AND
CAMSHAFT SPROCKET COVER
1. Check:
tappet covers
1
camshaft sprocket cover
2
O-rings
3
Damage/wear
Replace the defective
part(s).
2
1
3
3
EAS00210
CHECKING THE TIMING CHAIN
TENSIONER
1. Check:
timing chain tensioner
Cracks/damage
Replace.
2. Check:
one-way cam operation
Rough movement
Replace the timing
chain tensioner housing.
3. Check:
timing chain tensioner cap bolt
copper washer
spring
one-way cam
gasket
timing chain tensioner rod
Damage/wear
Replace the defective
part(s).
New
New
CHECKING THE CAMSHAFT SPROCKET
1. Check:
camshaft sprocket
Wear/damage
Replace the camshaft
sprocket and timing chain as a set.
a 1/4 of a tooth
b Correct
1 Roller
2 Sprocket
EAS00231
INSTALLING THE CYLINDER HEAD
1. Install:
dowel pins
cylinder head gasket
New