Yamaha F150A, Service Manual

Page: 261 / 493

7-36
Camshaft
Installing the driven sprocket and
camshaft
When the timing belt is not installed, do
not turn the crankshaft or driven sprock-
ets. Otherwise, the pistons and valves
could collide with each other and be dam-
aged.
1. Install new oil seals “1” and the dowels
“2” onto the camshafts “3” and “4”.
2. Install the camshafts so that the dowels
“2” are facing inward and that they are
aligned with the mating surface of the cyl-
inder head.
TIP:
Make sure that pistons #1 and #4 are posi-
tioned at the TDC.
3. Apply a thin, even coat of sealant to the
mating surface of the camshaft caps “1”.
4. Install the dowels “1”, camshaft caps “2”
and “3”, and camshaft cap bolts “4” and
“5”.
TIP:
Install the camshaft caps “2” and “3” in the
proper positions so that the stamped num-
bers are upside down.
Camshaft journal diameter “a”:
24.960–24.980 mm
(0.9827–0.9835 in)
Cylinder head journal inside diameter “b”:
25.000–25.021 mm
(0.9843–0.9851 in)
a
a
b
b
63P EX
63P IN
1
1
2
2
3
4
EX IN
2
UP
1