Yamaha XT660R, Service Manual

Page: 253 / 462

5 - 14
ENG
CYLINDER HEAD
c. Install the timing chain 1 onto the camshaft
sprocket
2
, then the camshaft sprocket
onto the camshaft, and then finger tighten
the camshaft sprocket bolts.
NOTE:
To install the camshaft sprocket sprocket,
install the projection
3
on the camshaft
sprocket into the slot
a
in the decompression
lever.
d. Make sure the “I” mark
d
on the camshaft
sprocket with the stationary pointer
e
on
the cylinder head.
NOTE:
_
• When installing the camshaft sprocket, be
sure to keep the timing chain as tight as pos-
sible at the exhaust end of the chain.
• Align the projection on the camshaft with the
slot in the camshaft sprocket.
CAUTION:
_
Do not turn the crankshaft when installing
the camshaft to avoid damage or improper
valve timing.
e. Remove the wire from the timing chain.
▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲ ▲▲▲ ▲ ▲▲▲
d
e
1
2
3
5. Install:
• timing chain tensioner
▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼▼▼
a. Remove the timing chain tensioner cap bolt
1
, copper washer
2
and spring
3
.
b. Release the timing chain tensioner one-way
cam
4
and push the timing chain tensioner
rod
5
all the way into the timing chain ten-
sioner housing.
c. Install the timing chain tensioner and gasket
6
onto the cylinder.
NOTE:
Install the gasket with its beaded side facing
the timing chain tensioner end.
T
R
.
.
Timing chain tensioner bolt
10 Nm (1.0 m · kg, 7.2 ft · lb)
6
3
2
1
New
New
4
5