Yamaha F80B, Service Manual

Page: 86 / 249

POWR
Power unit
5-17
6D93G11
Removing the timing belt and
sprockets
CAUTION:
• Do not turn the drive sprocket counter-
clockwise, otherwise the valve system
may be damaged.
• Do not turn the drive sprocket or the
driven sprockets when the timing belt is
not installed. Otherwise the piston and
valves will interfere with each other and
be damaged.
1. Turn the drive sprocket clockwise and
align the hole
a
on the retaining plate
with the projection
b
on the cylinder
block, and check that “ ” marks
c
and
d
on the driven sprockets are aligned.
2. Loosen the drive sprocket nut
1
.
NOTE:
• Use a deep socket
2
for this procedure.
• Do not turn the camshaft when loosening
the drive sprocket nut.
3. Disconnect the cooling water hose and
remove the bracket.
4. Remove the spring and timing belt ten-
sioner, and then remove the timing belt
from the driven sprockets, then from the
drive sprocket.
5. Loosen the driven sprocket bolts
4
, and
then remove the driven sprockets
5
.
NOTE:
Do not turn the camshafts when loosening
the driven sprocket bolts.
6. Remove the nut
1
, drive sprocket
6
,
retaining plate
7
, and Woodruff key
8
.
S6D85220
c
d
a
b
S6D85360
2
1
3
Crankshaft holder 20
3
:
90890-06552
Flywheel holder: 90890-06522
S6D85730
4
5
4