Rolls-Royce related technical info
(Supplied by Stephan Knappe)Electronic ignition module, replacement
1980 Rolls-Royce Silver Shadow II US Spec
I experienced some problems with my car suddenly stopping the engine
while driving. After some minutes waiting, it usually fired up again and ran like normal.
After some searching, on one occasion I found that there was no spark.
After exchanging some postings with RROC list members the general
consensus was that the ignition module and ballast resistors should be replaced.
I would like to thank JD for his assistance very much.
Ignition module
The complete electronic ignition module is situatued inside the
distributor. To remove it, the distributor can be left in place. I took out the
cruise control bellows first, to facilitate access. Then number B1 - B4 spark plug leads
were unhooked from distributor cap and laid aside, noting their positions carefully. Next
was to undo the distributor cap and rotor. The cover then visible is held by three
cross-slotted screws, remove this cover. Now you see the ignition module. Locate the
circlip which holds the timing rotor on the distributor shaft, remove circlip and pull
timing rotor upwards, noting its mounting position. Now remove the wiring loom plugs at
the ballast resistor, the ignition coil and the condensor below the distributor, if
applicable.
Undo the three mounting screws which hold the ignition module, these
are the same where the cover's screws thread into.
Pull out the ignition module carefully, freeing the connecting pin
of the module from the vacuum advance lever.
At this stage you see the centrifugal advance mechanism, check for
free movement and cleanliness, apply some drops of oil if necessary.
Installation is a reversal of the removal, but check the following
points:
- Before installing the module, slacken the pickup adjustment screws
and move pick-up to it's outer limit
- Check for secure location of the connecting pin in the vacuum
advance lever
- Adjust pick-up-gap to 0,4mm (0,015") with a plastic feeler
gauge.
- Check for sufficient clearance of cables from timing rotor inside
distributor.
After the work was completed, the engine started and ran perfectly.
Ballast resistor
The ballast resistor is located behind the right-hand cylinder head.
It has an aluminium body and is held by two screws.
Replacing is just removing these screws and unplugging two multiple
connectors on each side, but placing the outer connector on the ballast resistor on
reassembly requires a bit of fiddling. Be patient, it takes a little time, but can be
done!
General note:
The procedures written above are from my personal experience
repairing / maintaining my own cars.
I cannot guarantee that these procedures are correct for every car
of the model range,
which have been modified during the production years and for various
worldwide markets.