Yanmar 4BY - Assembly of Cylinder Head

ENGINE
5-30
BY Service Manual
Cylinder Head
Figure 5-30
6. Press valve stem seal into place with special
tool OEM No. 11 6 380 until it is seated
(Figure 5-30).
7. Install valve spring.
Assembly of Cylinder Head
1. Liberally lubricate all moving parts with clean
engine oil during assembly.
2. Install valves in cylinder head.
3. Install new valve stem seals. See Replacing
Valve Stem Seals on page 5-29.
Figure 5-31
4. Secure cylinder head to special tool OEM No.
11 9 001 (Figure 5-31).
5. Install spring compressor OEM No. 11 9 015 on
lever OEM No. 11 9 009 (Figure 5-31).
6. Install valve spring and retainer.
Figure 5-32
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.