I have a 1973 5.3L E-type. It is a UK car and fairly original. I have been reading lots of topics lately on carburettor setup, timing and the distributor.
Mainly because I went for a drive the other day, only to be flat bedded with a fuel leak.
My initial thoughts were old fuel hoses, so I ordered them, however when I made a start on the car, I switched the fuel pump on to find the leak but without any luck. I replaced all the hoses regardless (they needed it).
I then thought maybe its a stuck fuel float valve (which I think it was, the paint inside the air filter looked as though it had seen fuel, and a tink black something was found in the float valve).
Anyway I had now decided to overhaul all the carbs, so they had an ultrasonic clean, new gaskets and diaphrams. I reset all the bimetalic strips to be fully open at 60 deg C. I also blanked off the bypass valves with a home made brass gasket.
With a view to putting the carbs back on and setting up, I decided to look in the distributor and see if the retard unit was working. It isn’t and I don’t plan on replacing it, yet? (thoughts). Also the inside of the distributor was filthy, oily at the bottom with black bits?. I have decided to overhaul it.
I set the crank at 1A 12°BTDC and removed the distributor tops (All three screws with the springs broke). Re tapped. The advance mechanism was indeed sticky so have cleaned oiled and set back in place.
I am now onto the initial at least task of setting the larger spring within the advance mechanism.
I have taken the values from the Lucas distributor 41387 and the values from Mareks notes and overlayed them on a graph.
I have an 18° advance cam in the distributor which I am thinking would give me a further advance at the crank of 36°. This would be on top of the 12° set at idle. So a total of 48° advance. However both Marek and Lucas seem to give advice to about 36-38° advance at max rpm.
Also from the graphs it seems the secondary spring needs to start working at about 1500-1800rpm?And be at about 6° distributor advance.
So about a third of the cam movement is on the primary spring only, and then both springs for the final two thirds of cam movement. Would this be a good starting point?
The secondary spring on mine currently engages at the final 20% of movement.
Any help would be very much appreciated.