Checking The Cylinder Head; Installing The Valves - Yamaha F150A Service Manual

Camshaft runout limit:
0.03 mm (0.0012 in)
3. Measure the camshaft journal diameter
c and cylinder head journal inside diam-
eter d. Replace the camshaft and cylin-
der head if out of specification.
d
Camshaft journal diameter c:
24.960–24.980 mm
(0.9827–0.9835 in)
Camshaft cap inside diameter d:
25.000–25.021 mm
(0.9843–0.9851 in)
4. Calculate the camshaft oil clearance e
as follows. Replace the camshaft and
cylinder head as a set if out of specifica-
tion.
Camshaft oil clearance e =
Camshaft cap inside diameter d –
Camshaft journal diameter c:
0.020–0.060 mm
(0.0008–0.0024 in)
63P3F11

Checking the cylinder head

1. Eliminate carbon deposits from the com-
2. Check the cylinder head warpage using a
S63P5180
c
S69J5970

Installing the valves

1. Install a new valve seal 1 into the valve
bustion chambers and check for deterio-
ration.
straightedge 1 and thickness gauge 2
in seven directions as shown. Replace if
out of specification.
1
Cylinder head warpage limit:
0.10 mm (0.0039 in)
guide.
Cylinder head
1
2
2
3
4
S63P5190
5
6
S63P5200
7
8
9
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