Rolls-Royce Silver Shadow - Ignition timing-To set (static); Ignition timing-To set (stroboscopic method)

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Rolls-Royce Silver Shadow & Bentley T Series
Workshop Manual
FIG. M8 EXPLODED VIEW OF DISTRIBUTOR
1 Distributor cap
2 Rotor
3 Bush
4 Fixed contact retaining screw
5 Contact set
6 Contact
7 Condenser
8 Fibre insulating tab
9 Low tension terminal
10 C.B. earth lead
11 Fixed screw C.B. housing
12 Spring-screw-C.B. housing
13 Vacuum unit fixing screw
14 Vacuum unit timing control
15 Octane selector adjusting
screw-eccentric
16 Star spring
17 Circlip
18 Cam
19 Centrifugal timing control
20 Distance piece
21 Bearing
22 Sealing ring
23 Bearing bush
24 Thrust washer (fibre)
25 Securing plate
Ignition timing-To set
(stroboscopic method)
Cars prior to Car Serial Number 8742
To carry out the ignition timing proceed as follows.
1.
Run the engine until normal operating tem-
perature is reached and the automatic choke is in
the off position.
2. Stop the engine.
3.
Check that the octane selector position is in
the fully advanced position and that the scale is set
to the 'A' mark and adjust if necessary
(see Fig. M7).
Adjustment is carried out by slackening the lock-
nut and turning the slotted screw.
4.
Ignition timing is carried out on 'Al' cylinder
and should be set to
~'B.T.D.c. The 'A' bank is
the right-hand side and the
'B' bank is the left-hand
side when viewed from the driver's seat.
5. Connect a stroboscope and an electric impulse
tachometer to the ignition system as described in
the manufacturer's instructions.
6.
Start the engine then adjust the throttle stop
to give an idle speed of 500
[.p.m.
7.
Direct the flashing light of the timer on to the
crankshaft damper timing marks and timing pointer.
Chapter M
8.
Check and adjust the igniti-on timing if
necessary. To adjust the timing, release the clamp
screw on the distributor and rotate the head of the
distributor in the appropriate direction until the
correct timing is obtained. Clockwise rotation of the
distributor head advances the ignition 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.
9.
Adjust the throttle stop to give an idle speed
of between 550
r.p.m. and 600 r.p.m.
10. Switch off the ignition.
11.
Remove the tachometer and stroboscopic
timing equipment.
Note If the car is operating in a territory
where only low octane fuels are avail-
able, it will be necessary to
retard the
ignition to obtain optimum performance.