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Yanmar 4BY - Page 82

Yanmar 4BY
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ENGINE
BY Service Manual
5-27
Cylinder Head
Figure 5-22
5. Secure cylinder head to special tool OEM No.
11 9 001 (Figure 5-22).
6. Install spring compressor OEM No. 11 9 015 on
lever OEM No. 11 9 009.
7. Press down to compress valve spring and lock
in place with special tool OEM No. 11 9 011.
Figure 5-23
8. Remove valve keepers (Figure 5-23).
Figure 5-24
1–Valve
2 Valve Stem Seal
3–Valve Spring
4 Valve Spring Retainer
5 Valve Keeper (2 used each valve)
9. Release tension on valve spring and remove
valve spring retainer and valve spring.
10. Remove valve stem seals. See Replacing Valve
Stem Seals on page 5-29.

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