I
P
I
P
I
P
44--- 7
I
P
Valve Mechanism
4---2
7. Separate the camshaft from the gear wheel using a press
or suitable drift.
8. Clean the parts which are to be refitted.
9. Fit the key in its groove. Heat the camshaft gear to
200
˚
C
in an oven and fit it on the shaft.
10. Lubricate bearing surfaces and lobes and insert the shaft
in the cylinder block. Ensure that the aligning marks on the
gears agree.
11. Fit the timing gear casing cover ,the hub, damper and
crankshaft V---belt pulley.
12. Free the pushrods and fit the rocker arm mechanism.
Adjust the valves. Fit the valve cover and the breather pipe
and the inlet pipe between the turbocharger and the intake
manifold.
13. Fit the other removed parts.
Modification of the cam shaft
From engine no L 17961 all 645 engines are equipped with a
cam shaft where the front end bearing location has no oil
groove (the bearing location is so called barrel shape)
30
˚
41--- 4/1
Note!
The new cam shaft is not fitting together with any previ-
ous bushing. The new bushing is recognised from the posi-
tion of the oil drilling which is not at the same place as the oil
drilling of the cylinder block,
30
˚
angle upwards from the hori-
zontal level.
C. Adjusting valves
0,35
44--- 6
The valve clearance, which can be adjusted on a hot or cold
engine, is
0,35 mm
for both inlet and exhaust valves. The
clearance is adjusted when the respective piston is at T.D.C.
in the compression stroke. The valves for the different cylin-
ders are adjusted in the same sequence as the order of injec-
tion.
--- Slacken the lock nut of the adjusting screw.
--- Measure clearance with a feeler gauge. The clearance is
correct when a
0,35 mm
feeler gauge is slightly tight---fitted
between the rocker arm and the valve stem end. Adjust clear-
ance by rotating the adjusting screw.
--- Tighten the locking nut and check the clearance.
Engine front end
INLET
EXHAUST
Adjusting
--- Rotate the crankshaft in the running direction until the
valves in the 6th cylinder are rocking (exhaust closes, inlet
opens). Check the valve clearance of the 1st cylinder.
--- Rotate the crankshaft by 1/3 of a turn in the running direc-
tion so that valves in the 2nd cylinder are rocking. Check
valves in the 5th cylinder.
---Continue according to the order of injection:
Injection order
1 5 3 6 2 4
Valves rock in cyl. no.
6 2 4 1 5 3