Yanmar BY Series Service Manual page 85

Cylinder Head
12/05
5. Secure cylinder head to special tool OEM No.
11 9 001 (Figure 5-23).
Figure 5-23
Figure 5-23
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.
8. NOTICE: Mark all valve train components so
they can be installed back in their original
locations.
Remove valve keepers (Figure 5-24).
Figure 5-24
Figure 5-24
BY Service Manual
Figure 5-25
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. Repeat for all cylinders.
11. Remove valve stem seals. See Replace Valve
Stem Seals on page 5-25.
© 2009 Yanmar Marine International
ENGINE
Figure 5-25
5-23