Removing The Driven Sprocket And Camshaft; Checking The Driven Sprocket; Checking The Camshaft - Yamaha F150A Service Manual

Removing 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. Remove the cylinder head cover.
2. Secure the camshaft using a wrench,
and then remove the driven sprockets
"1".
1
3. Remove the camshaft caps "1" and "2",
camshafts "3" and "4", and oil seals "5".
2
2
2
2
2
1
2
2
1
3 5
2
1
4 5

Checking the driven sprocket

1. Check the driven sprockets. Replace if
cracked, damaged, or worn.

Checking the camshaft

1. Measure the cam lobe height "a" and
width "b".
Cam lobe height "a":
Intake:
45.310–45.410 mm
(1.7839–1.7878 in)
Exhaust:
44.360–44.460 mm
(1.7465–1.7504 in)
Cam lobe width "b":
Intake and exhaust:
35.950–36.050 mm
(1.4154–1.4193 in)
2. Measure the camshaft runout.
Camshaft runout:
0.03 mm (0.0012 in)
3. Measure the camshaft journal diameter
"a" and cylinder head journal inside
diameter "b".
7-35
Camshaft
a
b
0
1
2
3
4
5
6
7
8
9
10
A