Yanmar 4TNV98, Service Manual

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4TNV98 & 4TNE98 Diesel Engine Section 3. Engine 92
4. Slowly release the tension on the valve spring.
5. Remove the spring retainer (Figure 6-11, (3)),
valve spring (Figure 6-11, (4)) and valve stem
seal (Figure 6-11, (5)) .
Figure 6-11
6. Repeat this procedure until all the intake and
exhaust valve springs and valve stem seals are
removed.
NOTE : If you are going to reinstall the valves in the
cylinder head, mark them so they can be installed in
their original location.
7. Turn the cylinder head so the exhaust port side
faces down. Remove the intake and exhaust
valves
(Figure 6-11, (6)) from the cylinder head.
Removal of Valve Guides
1.
Using a drift pin and hammer, drive the valve
guides (Figure 6-12, (1)) out of the cylinder head.
Figure 6-12
Cleaning of Cylinder Head Components
WARNING
FUME / BURN HAZARD!
Always read and follow safety related
precautions found on containers of hazardous
substances like parts cleaners, primers, sealants
and sealant removers.
Failure to comply could result in death or
serious injury.