51
Model Code Page
21. Engine
1. 9. 1992
6000--8750 212 1
8. 11. 1990
Cylinder head and valve
mechanism (Op no 212)
1. Cylinder head
A. Removing cylinder he ad
1.Removetheenginehoodplates.Cleantheengineexter-
nally and drain the coolant. Disconnect the coolant hoses
from the cylinder head and the thermostat housing.
2. Remove the suction hoses bet ween the turbocharger and
the air filter and between the turbocharger and the inlet mani-
fold (turbocharger only on 6100---6600 tractors).
3. Disconnect the turbochar ger pressure and return oil pipes.
4. Remove the pipes to the thermostart fuel reservoir.
5. Remove the injector leak---off fuel pipes and the delivery
pipes. Remove the injectors. Fit blanking---off caps on all
open connections.
6. Remove the inletand exhaust manifoldsand the thermostat
housing.
Note! It is possible to remove the cylinder head even thought
these parts are attached to the head.
7. Remove the valve cover and the breather hose.
8. Remove the rocker arm mechanism and the push rods.
9. Loos enall the cylinder head bolts firstby a 1/4 turn and then
remove them. Remove the cylinder head.
B. Removing valves
Ensure that valves which are to be re---used are marked, so
that they are fitted in their original locations.
9052 47200
1. Thread the counterhold nuts 9052 47200 onto a screw stud
for the rocker arm mechanism. On t he 320---, and
620---engines there is not a screw stud at the valves for the
centre cylinder. A bolt of suitable length should be used
instead.
2. Compress the valve springs using lever 9101 66200. Re-
move the valve cotters, spring guide and spring. Remove the
valves.
C. Checking cylinder head
1. Remove carbon deposits from the exhaust ports, clean the
sealing surfaces and was h the cylinder head.
2. Chec k for cracks and other damage.
3. Check the flatness of the cylinder head by using a straight
edge. An uneven or warped surface s hould be surface
ground.The height of the cylinder head,after grinding,should
not be less than 104,00 mm. The valve disc depth from the
cylinder head surface shoul d be 0,60 mm for the exhaust
valves and 0, 70 mm for the inlet valves.
9101 66000
4. Straighten and c lean the injector location seat in t he cylin-
der head with cutter 9101 66000.
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