Rolls- Royce Silver Shadow
8
Bentley
T
Series
Workshop
Manual
Chapter
M
8.
Adjust the throttle screw to give an idle speed
of 600 r.p.m.
9.
Switch off the ignition.
10.
Remove the tachometer and stroboscopic timing
equipment.
lgnition timing-To set (static)
Cars from Car Serial Number 8742 without
Opus ignition
1.
Turn the distributor spindle until the rotor arm
aligns with Number 'Al' cylinder ignition period.
2.
Release the distributor clamping screw.
3.
Rotate the distributor body until the contact
Table
2
For cars fitted with Emission Control Systems,
refer to Chapter U. All other cars are as follows:
breaker points are just breaking.
4.
During the above operation hold the top of the
rotor arm in the fully retarded (anti-clockwise
Car Serial Number Timing
Up to 9000
3'
B.T.D.C.
@
500 r.p.m.
9001 to 22 11
7
5"
B.T.D.C.
@
800 r.p.ni.
221 18 onwards 15" B.T.D.C.
@
1200 r.p.m.
rotation) position to take up any backlash in the
centrifugal advance mechanism.
5.
Clockwise rotation of the distributor advances
the ignition timing and anti-clockwise rotation
retards the ignition timing.
6.
To check when the contact points are
breaking, use an ignition timing lamp.
7.
Tighten the distributor clamping screw to lock
Distributor-To dismantle
and overhaul
Cars prior to Car Serial Number 8742
the body in position.
8.
Rotate the crankshaft two full turns in the
normal direction of rotation and with the aid of the
ignition timing lamp, again check to ensure that the
An
exploded view of the distributor is shown in
Figure
MS.
Note
Before dismantling take care to note the
position of the parts in relation to each
other to ensure correct re-assembly.
1.
Remove the distributor from the crankcase as
described in Distributor
-
To remove.
2.
Remove the contact breaker points.
contact points are just breaking when the rotor arm
is in line with Number 'Al' firing position and the
flywheel is at T.D.C.
lgnition timing-To set
(stroboscopic method)
Cars from Car Serial Number 8742
3.
Remove the condenser.
4.
Remove the three spring-loaded screws.
For cars fitted with the Exhaust Emission Control
5.
Withdraw the upper portion of the distributor
to expose the centrifugal advance mechanism.
6.
Remove the circlip which retains the star
washer on the underside of the contact breaker
housing.
7,
Lift the contact breaker base plate out of the
System, refer to Chapter
U
-
Exhaust Emission
Control System.
For all other cars proceed as follows.
1.
Run the engine until normal operating tem-
perature
5s reached and the automatic choke is off.
2. Stop the engine.
Note
Ignition timing is set to 5'B.T.D.C. on
A1
cylinder; A1 cylinder is the front cylinder
housing.
8. Remove the screw securing the vacuum control
unit and remove the unit.
on the left-hand side when viewed from
9.
Remove the cam spindle screw and withdraw
the front of the engine.
3.
Set the dwell angle as described in Dwell
angle
-
To adjust. (Not applicable to Opus).
4.
Connect a stroboscope and an electric impulse
tachometer to the engine as described in the manu-
facturer's instructions.
5.
Start the engine and adjust the fixed throttle
screw to give an idle speed of
800
r.p.m.
6.
Direct the flashing light of the timer on to the
crankshaft damper timing marks and timing pointer.
7.
Check and if necessary adjust the ignition
timing. To adjust the timing, release the clamp
screw on the distributor and rotate the head of the
distributor in the appropriate direction until the
the cam assembly.
10.
Lift the weights, springs and toggles off the
action plate.
11.
Withdraw the tapered retaining pin securing the
driving sleeve to the shaft.
12.
Remove the driving sleeve from the shaft; lift
off the thrust washer.
13.
Press out the driving shaft from the distributor
body, taking care not to lose the distance piece
positioned beneath the centrifugal timing control
mounting plate.
Distributor-To inspect
Cars prior to Car Serial Number 8742
1. Check the bearing at the top of the distributor
body shaft housing. If excessive wear or roughness
is detected the bearing should be renewed. The
bearing should be removed using a 'Claw' extractor.
correct timing is obtained. Clockwise rotation of the
distributor head advances the
innition and anti-
-
clockwise rotation retards the ignition. After adjust-
ment has been carried out tighten the clamp screw
and again check the timing to ensure that it has not
altered whilst tightening the clamp screw.
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