Rolls-Royce Silver Shadow
8
Bentlev
T
Series
Workshop
Manual
Correct
where
necessary.
Pump leakage
in the reservoir between 150°F. (65~6°C.) and 170°F.
1. Tighten all fittings and bolts.
(76.7"C.)
(normal operating temperature).
Note
To obtain the fluid temperature required
2.
Try to determine the source of leakage by
for this test, turn the wheels from
lock-
cleaning the exterior of the pump assembly.
to-lock several times.
3.
Possible sources of pump leakage are as follows:
Do
not hold the
wheels against
their
respective lock-stops for
any
extended
period
of time.
If
the maximum pressure is below specification, this
indicates that a fault is present in the hydraulic circuit.
To determine whether the fault lies in the pump or
control valve, proceed with the second test. It will not
be
necessary to proceed with the second test if the
pressure differential between each full lock is more
than 40
lb/sq.
in.
(2,81
kglsq.
cm.),
since this indicates
that the steering box valve is at fault.
Second test-fluid circuit closed
1.
Apply the handbrake, run the engine at idle speed
(500
r.p.m.), the gear lever in
'P'
or
'N'
position and
the refrigeration system switched off.
2.
Turn the valve of the gauge to the closed position.
Power assistance poor or negligible or pump inoperative
Note
The gauge cut-off valve must be located
1.
Check driving belt(s) tension.
between the gauge and steering box.
2.
Check and fill the pump reservoir and bleed the
3.
Observe and compare the maximum Pump Pres-
steering system.
sure at idle. It should not
be
less than that specified.
3.
Wterrnine the source of fault, i.e. the pump,
steering box
or
hoses. Fit the pressure gauge in the
pressure line between the steering pump and steering
box.
First test-fluid circuit open
1.
Apply the handbrake, start the engine then, turn
the steering wheel through full turns from lock-to-lock
holding the wheels momentarily against each lock
stop and note the pressure
on
the gauge. This maxi-
mum pressure reading should not
be
less than 665
lb/sq. in. (46,75 kghq. cm.) with the engine idling at
500
r.p.m. (refrigeration system switched off), the gear
selector in
'P'
or
'N'
position and the fluid temperature
Test comparison
By comparing the reading in
3
above, it is possible to
determine whether the fault lies in the pump or
steering box or both.
If the
first test
is
below
specification, and the
second test
is
equal or greater
to the specification, the
steering box is at fault.
If the
first test
is
below
specification, and the second
test is not more than 50
Ib/sq. in. (33 kglsq. cm.)
greater, the steering pump is at fault and a full in-
spection of the pump is necessary.
If the steering box is at fault, refer to Section
N5-
The Steering Box for overhaul procedure.
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