ENGINE
Cylinder Head
5-26 BY Service Manual
© 2009 Yanmar Marine International
6. Press valve stem seal into place with special
tool OEM No. 11 6 380 until it is seated
(Figure 5-31).
Figure 5-31
Figure 5-31
7. Install valve spring.
Assemble Cylinder Head
1. Liberally lubricate all moving parts with clean
engine oil during assembly.
2. Install the valves in cylinder head.
3. Install new valve stem seals. See Replace
Valve Stem Seals on page 5-25.
4. Secure cylinder head to special tool OEM No.
11 9 001 (Figure 5-32).
Figure 5-32
Figure 5-32
5. Install spring compressor OEM No. 11 9 015 on
lever OEM No. 11 9 009 (Figure 5-32).
6. Install valve spring and retainer.
7. Press down to compress valve spring and lock
in place with special tool OEM No. 11 9 011
(Figure 5-32).
8. Install valve keepers.
9. Allow the valve spring to expand against the
keepers. Repeat with remaining valves.
Determine Cylinder Head Gasket
Thickness
1. Thoroughly clean all old gasket material from
the cylinder head gasket surface of the cylinder
block.
2. Clean all carbon and deposits from measuring
locations of each piston.
3. Place a dial indicator with measuring fixture
OEM No. 00 2 530 on clean cylinder block
(Figure 5-33). Set the dial to zero.
Figure 5-33
Figure 5-33
4. Rotate the crankshaft to bring piston to the top
of its stroke.
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