Yamaha F100A - Camshaft Inspection; Camshaft Installation; Service Points

5-21
POWR
E
CAMSHAFTS
SERVICE POINTS
Camshaft inspection
1. Measure:
●
Camshaft lobe dimensions a and b
Out of specification → Replace the
camshaft.
2. Measure:
● Camshaft journal diameter a
●
Camshaft cap inside diameter b
Out of specification → Replace the
camshaft or cylinder head.
Camshaft lobe dimension:
a IN: 37.22 ~ 37.38 mm
(1.465 ~ 1.472 in)
b IN: 29.92 ~ 30.08 mm
(1.178 ~ 1.184 in)
a EX: 36.90 ~ 37.06 mm
(1.453 ~ 1.459 in)
b EX: 29.92 ~ 30.08 mm
(1.178 ~ 1.184 in)
Camshaft journal diameter:
a : 24.96 ~ 24.98 mm
(0.9827 ~ 0.9835 in)
Camshaft cap inside diameter:
b : 25.000 ~ 25.021 mm
(0.984 ~ 0.985 in)
b
b
a
Camshaft installation
1. Install:
●
Camshaft
●
Camshaft cap
Installation steps:
●
Before installing the exhaust and
intake camshafts, turn the crankshaft
until cylinder #1’s piston is at TDC on
the compression stroke.
●
Install the camshaft caps in the proper
position as shown and with the
stamped numbers facing upside
down.
5
2A
1
1
A
7
2A
6
1
A
8
2A
9
2A
10
2A
6
7
8
9
10
2
2A
1
1
A
3
2A
4
2A
5
2A
1
2
3
4
5