Yamaha F150A, Service Manual

Page: 242 / 493

7-17
Timing belt
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A
Removing the timing belt
When the timing belt is not installed, do
not turn the crankshaft or driven sprocket.
Otherwise, the pistons and valves could
collide with each other and be damaged.
1. Turn the crankshaft clockwise to align the
mark “a” in the drive sprocket and the
protrusion “b” on the cylinder block.
Check that the “I” marks “c” and “d” on
the driven sprockets are aligned.
2. Turn the timing belt tensioner gradually
clockwise using a hexagon wrench, and
then insert a 5.0 mm (0.2 in) diameter pin
“1” into the hole “a”.
TIP:
• When turning the timing belt tensioner,
apply a force of 15 N·m (1.5 kgf·m,
11.1 ft·lb) or less.
• Leave the pin “1” inserted into the hole “a”
of the timing belt tensioner until the timing
belt is installed again.
3. Remove the timing belt “1” from the
driven sprocket side.
Removing the drive sprocket
1. Remove the drive sprocket “1”, plate “2”,
and dowel “3”.
Checking the timing belt
1. Check the interior and exterior of the tim-
ing belt. Replace if cracked, damaged, or
worn.
Installing the drive sprocket
1. Install the dowel “1”, plate “2”, and drive
sprocket “3”, and then tighten the drive
sprocket bolts “4” to the specified torque.
a
b
d
c
a
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