Checking The Valve Guides; Replacing The Valve Guides - Yamaha F15B Service Manual

3. Measure the valve stem diameter b.
Replace if out of specification.
b
Valve stem diameter b:
Intake:
5.475–5.490 mm (0.2156–0.2161 in)
Exhaust:
5.460–5.475 mm (0.2150–0.2156 in)
4. Measure the valve stem run-out. Replace
if out of specification.
Valve stem run-out limit:
Intake: 0.01 mm (0.0004 in)
Exhaust: 0.01 mm (0.0004 in)

Checking the valve guides

1. Measure the valve guide inside diameter
a. Replace if out of specification.
a
6D45F11

Replacing the valve guides

1. Remove the valve guide 1 by striking the
special service tool from the combustion
chamber side.
6D450580
2. Install the new valve guide 2 by striking
the special service tool from the camshaft
side until the valve guide clip 3 contacts
the cylinder head.
6D450590
NOTE:
Apply engine oil to the surface of the new
valve guide.
6D450600
Cylinder head
Valve guide inside diameter limit a:
5.500–5.512 mm
(0.2165–0.2170 in)
1
Valve guide remover/installer:
90890-06801
5
4
2
3
Valve guide remover/installer 4:
90890-06801
Valve guide installer 5:
90890-06802
1
2
3
6D450610
4
5
6
7
6D450620
8
9
5-26