Workshop Manual
Rolls Royce Silver Shadow
6
Bentley
7
Ser~es
Chapter
N
Checking steering box pre-load
(steering box on car)
1.
When the steering gear is thought to be out of ad-
justment a quick check can be made by moving the
steering wheel to and fro with short slow motions
at
the 'on centre' position with the ignition switched
off. Excessive looseness felt or heard indicates that
either the rocking shaft or the thrust bearing requires
adjustment.
These adjustments can be made on the
car by using the following procedure.
Thrust bearing pre-load check
(2
turns off-centre)
1.
Remove the pendulum lever from the cross-beam
using pendulum lever puller (RH 8100).
2. Turn the steering wheel two turns 'off-centre';
just away from the stops, and use a spring tension
gauge with a piece of wire or strong cord to measure
the pull on the steering wheel rim through an arc not
exceeding one inch (see
Fig.
N37).
The total pull
should be between 4 oz. and 12 oz. (0,113 kg. and 0,340
kg.) (thrust bearing and friction). If the 'off-centre'
pull is greater or less than specified, loosen the ad-
juster plug lock-nut and back off the adjuster plug
4
of
a
turn using
a
spanner wrench (RH 7788).
Note If the position of the holes in the ad-
juster plug is such that there is insufficient
clearance for using the spanner wrench,
insert a bolt
2
in. (19 mm.) long in one of
the adjuster plug holes and rotate the
coupling flange until the lower flange
contacts the bolt. Then back off the
adjuster plug
4
of a turn.
FIG.
N37
CHECKING
THE
STEERING
BOX
PRE-LOAD
3. Recheck the steering wheel 'pull' with the wheel
two turns 'off-centre'. Adjust the pre-load by tightening
the adjuster plug to obtain 2 oz. to 6 oz. (0,056 kg.
to 0,170 kg.) (at the rim of the wheel) in excess of
the total drag that was just measured with the adjuster
plug backed-off
4
of a turn.
4. Tighten the adjuster plug lock-nut and recheck
the pre-load to ensure the plug did not move when the
nut was tightened.
Checking rocking shaft end play (On centre)
1. Find the exact centre of the steering wheel travel.
The tight spot due to the rocking shaft should extend
for
f
of a turn to either side.
2. With the steering wheel 'on-centre' measure and
record the total pull through an arc of three inches or
less.
This reading should not be more than 36
oz. (1,02
kg.), but should
be
at least 8 oz. (0,226 kg.) but
never more than 20 oz. (0,566 kg.) more than a
reading taken
4
a turn 'off-centre'.
Note On new steering boxes the factory setting
with ball bearing pre-loads and new seal
drag may cause a total pull to be as high
as 40 oz.
(1,13 kg.). Within the first
100 miles (160 km.) of operation the seals
seat themselves and the ball bearings
polish the rack-piston and worm shaft
grooves sufficiently to meet the service
specifications.
If the rocking shaft end play is not within limits, it
should be adjusted so that 'on-centre' pre-load is
between 16 oz. and 18 oz. (0,453 kg. and 0,510 kg.)
more than the
4
turn 'off-centre' load but still not
more than 36
ozy (1,02 kg.).
3. Adjust the pre-load by loosening the lock-nut
and turning the adjusting screws as required. Recheck
the pull after tightening the lock-nut. Check for
rough spots in the rocking shaft sector and power
piston rack by turning the wheel a of a turn to the
left and a
of a turn
fo the right.
4.
A visual inspection of the gear teeth will reveal
necessary correction, if rough spots are found.
Remember, however, that the teeth are not absolutely
smooth, but are machined to hold lubricant.
5.
When the steering adjustments are completed,
remove the spring tension gauge and wire or cord
connection. Then connect the pendulum lever to the
cross-beam and tighten the cross-beam nut to between
35 lb. ft. and 40 lb. ft.
(4,83
kg.m. and 5,33 kg.m.).
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