I've just had a flyweight in my Ducellier distributor (2388A R248 C34) in the R12 come adrift for the second time. This time it wore a deep groove inside the casting. Anyway, in the process of dismantling etc., I didn't notice which weight had the stronger spring - the heavy weight or the lighter weight. Goose.
Does anyone know? I assume this affects the advance curve significantly. I've put the stronger spring on the heavier weight, as you'd expect, but I'm not sure... Also, anyone know where I can get a detailed diagram for it? I've got a feeling there might be some parts missing, hence the failure. I know part of the problem is wear in the pivot of the weight, which I'm going to braze up and re-drill. The Haynes manual has a reasonably detailed diagram, but not detailed enough.
Incidentally, I noticed in the process that the vacuum advance diaphragm wasn't working even slightly, so installed a spare I had. I took the old diaphragm apart (using a bench grinder round the edge) and lo an behold, the diapragm had never worked - it wasn't round, but had a flat part across one side, and had been made like this. Weird. So the car has sucked air through this for the whole time I've owned it.
And the spare dizzy I pillaged the diaphragm from had the flyweights modified to prevent the problem mine had. Must be a common failure.
Any help would be much appreciated!
Cheers
Stuey
Does anyone know? I assume this affects the advance curve significantly. I've put the stronger spring on the heavier weight, as you'd expect, but I'm not sure... Also, anyone know where I can get a detailed diagram for it? I've got a feeling there might be some parts missing, hence the failure. I know part of the problem is wear in the pivot of the weight, which I'm going to braze up and re-drill. The Haynes manual has a reasonably detailed diagram, but not detailed enough.
Incidentally, I noticed in the process that the vacuum advance diaphragm wasn't working even slightly, so installed a spare I had. I took the old diaphragm apart (using a bench grinder round the edge) and lo an behold, the diapragm had never worked - it wasn't round, but had a flat part across one side, and had been made like this. Weird. So the car has sucked air through this for the whole time I've owned it.
And the spare dizzy I pillaged the diaphragm from had the flyweights modified to prevent the problem mine had. Must be a common failure.
Any help would be much appreciated!
Cheers
Stuey