Checking The Camshaft - Yamaha F15B Service Manual

a
b
c
Rocker arm inside diameter b:
13.000–13.018 mm
(0.5118–0.5125 in)
Rocker arm shaft outside diameter c:
12.941–12.951 mm
(0.5095–0.5099 in)

Checking the camshaft

1. Measure the cam lobe. Replace if out of
specification.
Cam lobe a:
Intake:
27.596–27.696 mm
(1.0865–1.0904 in)
Exhaust:
27.616–27.716 mm
(1.0872–1.0912 in)
Cam lobe b:
Intake:
23.950–24.050 mm
(0.9429–0.9468 in)
Exhaust:
23.950–24.050 mm
(0.9429–0.9468 in)
6D45F11
2. Measure the camshaft run-out. Replace if
out of specification.
6D450770
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.
6D450780
4. Check the automatic decompression
mechanism for cracks or damage.
Replace the camshaft if necessary.
Cylinder head
Camshaft run-out limit:
0.03 mm (0.0012 in)
d
Camshaft journal diameter c:
34.935–34.955 mm
(1.3754–1.3762 in)
Cylinder head journal
inside diameter d:
35.000–35.012 mm
(1.3780–1.3784 in)
Camshaft journal oil clearance:
0.050–0.080 mm
(0.0020–0.0032 in)
1
2
6D450790
3
4
5
c
6
6D450800
7
8
9
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