Removing, Cleaning - Volvo DH10A 245 Service Manual

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The valve mechanism for each cylinder head consists
of:
– an inlet valve and an outlet valve
– valve guides
– double valve springs with washers and valve locks
– rocker arms with adjusting screws
– rocker arm shaft with bearing brackets
– push rods and valve tappets
The material in the outlet valves is nimonic.The inlet
valves contain nickel and chromium. Valve guides and
valve seats are replaceable.
Cylinder head, removing/cleaning
Special tools:
(998) 5468 Valve spring clamp
(999) 6239 Lift chain
6643 Extractor
1. Drain the coolant.
2. Remove...
– rocker arm cover
– delivery pipes
– injectors, rocker arm bracket and push rods.
If necessary, use extractor 6643 to remove the injec-
tors.
Some alterations have been made to the cylinder head,
compare with the THD 104-engine, particularly with
regard to optimating inlet air flow.
New features
1. Valve seats and valves on the inlet side have been
moved down one millimetre.
2. The inlet valve has a rounded disc edge and small-
er stem diameter, below the valve guide.
3. The inlet valve spring face has been moved down
one millimetre.
4. The exhaust valve inside has been bevelled to im-
prove exhaust flow.
5. New type of cast plug, of cast iron. Use lock fluid
when fitting plugs of this kind. (Die tool 999
8419.)