Rolls-Royce
Silver
Shadow
6
Bentley
T
Series
Workshop
Manual
Chapter
N
steady twisting pull to prevent jamming.
If slight
sticking occurs, carefully work the spool back into
the valve body. If this does not free the spool it has
become cocked
in
the valve body bore, and no attempt
shouId
be
made to force the spool in
or
out. Con-
tinue to dismantle the valve assembly as follows and
remove the spool as described later.
6.
Remove the stub shaft, torsion bar, and valve
cap assembly by holding the valve assembly in both
hands as before, only with the thumbs on the valve
body. Lightly tap the torsion bar against a work
bench. This
will
dislodge the cap from the valve
body-to-cap pin. The stub shaft torsion bar and valve
cap assembly can now be removed from the valve body.
7.
If the valve spool has become cocked as des-
cribed earlier, it can now be freed. Visual inspection
on a flat surface will show in which direction the spool
is cocked. A few very light taps with a light hide
mallet should align the spool in the bore and free it.
Note
Do not tap the spool with anything
metallic.
Stub shaft and valve-To inspect
1. If there is evidence that the torsion bar
'0'
ring
seal inside the stub shaft has been leaking, the entire
valve assembly should be renewed.
2.
Check the pin in the valve body that engages the
cap. If it is severely worn, cracked or broken, the
entire valve assembly should
be
renewed.
3. Check the smaller of the two worm pin grooves
in the valve body. If this is severely worn, the entire
valve assembly should be renewed.
4.
Check the spool drive pin on the stub shaft. If it
is severely worn, cracked or broken, the entire valve
assembly should
be
renewed.
5.
Examine the spool outside diameter for nicks,
burrs, or badly worn spots. If evidence of any of
these is found, the entire valve assembly should be
renewed.
A
slight polishing effect on valve surfaces
is normal.
6.
Check the fit of the spool in the valve body
before inserting the valve spool
dambing
'0'
ring seal.
7.
When lubricated with the approved power
steering fluid the spool should rotate freely. If binding
or catching occurs the entire valve assembly should be
renewed.
8.
Measure the length of the spool spring; the free
length should
be
0.83
in. (21,O mm.). The inner
diameter of the top loop of the spring should be
between
0.76 in. and
0-8
in. (19,44 mm. and 20,24 mm.).
Renew the spring if the measurements are not as
specified.
FIG. N33 INSTALLING VALVE RING
9.
Examine the needle bearing diameter of the stub
shaft. If it is badly worn or scored, the entire valve
assembly should
be
renewed.
10. Examine the valve body rings, if damaged,
carefully cut the valve rings and
'0'
ring backing seals.
Remove and discard them.
Stub shaft and valve-To assemble
1. If new valve body ring backing
'0'
rings seals
are necessary lubricate them with the approved power
steering fluid and fit them in the ring grooves on the
valve body. Do not allow the seals to become twisted.
If new valve body rings are necessary, lubricate
them
with the approved power steering fluid and fit the
valve rings in the ring grooves over the backing
'0'
ring seals by carefully slipping the rings over the valve
body
(see
Fig.
N33).
The rings may appear to be loose
in the grooves, but the heat of the fluid after assembly
will cause them
to
tighten.
FIG. N34 INSTALLING STUB SHAFT IN VALVE
BODY
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