1
2
3
4
Removing and installing valves
91
Removing valves
Remove rocker arms. Take off cylinder head,
see page 85.
Fig. 1
Note:
Valve spring and valve spring retainer
can also be replaced with the cylinder
head installed.
For this purpose the relevant piston must
be at TDC, and the valve assembly lever
is required.
D Fit valve assembly lever to cylinder head
D Screw in setting screw so that the lever points
slightly upwards
Fig. 2
Note:
If a valve fixture is available in the work-
shop, the procedure described may also
be carried out on the said fixture.
D Press spring plate and spring downwards with
valve assembly lever and take out the valve
cone pieces using a magnet
D Move assembly lever upwards - Caution:
spring under tension, risk of injury - and
away to one side
Figs. 3 and 4
D Take off the upper spring plate, the valve
springs and the washer
D Turn cylinder head over. Pull out inlet and ex-
haust valves and put them aside, arranging or
marking them in the sequence of installation
D Turn cylinder head over again and pull off valve
stem seal (arrow)
D Check the valves for damage, if necessary ex-
changing them
D Measure the valve springs and exchange fati-
gued springs
D Check the valve stems and guides for scores
and wear, if necessary measuring the guides
with a plug gauge
D Check the valve seats for heavy indentation or
signs of burn-out, if necessary grinding the
valves or exchanging the seat insert
D Rework valve seat insert (see instructions of
milling machine manufacturers), or if necessary
exchange it
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