ENGINE
Cylinder Head
12/05
BY Service Manual
5-25
© 2009 Yanmar Marine International
Inspection of Valve Guides
1. Insert a NEW valve so the end is flush with the
valve spring end of the valve guide.
2. Install dial indicator OEM No. 00 2 510 or
similar as shown (Figure 5-28).
Figure 5-28
Figure 5-28
3. Move valve back and forth while reading dial
indicator.
Results: If measurement exceeds specification,
the cylinder head and valves must be replaced.
Specifications
Replace Valve Stem Seals
1. Remove the valve spring. It is not necessary to
remove valve.
2. Press special tool OEM No. 11 6 370 onto valve
stem seal and turn (Figure 5-29).
Figure 5-2 9
Figure 5-29
3. Remove special tool together with valve stem
seal.
4. Lubricate valve stem and install special tool
OEM No. 11 1 960.
5. Coat new valve stem seal (Figure 5-30, (1))
with oil and install over tool. Remove special
tool OEM No. 11 1 960.
Figure 5-3 0
Figure 5-30
Inspection Item Limit
Valve Guide
Wear
Intake
0.5 mm
(0.020 in.)
Exhaust
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