Re: camshaft (Long)
Let's return to the OP's original question: "My question is - can a model A "jump" timing if the camshaft thrust plunger is not doing it's job because of a weak spring or some other reason?"
The answer is Hell, yes! The spring may be weak or simply broken. I chased this all over the ignition, timing, compression, and fuel delivery universe before discovering a broken camshaft thrust plunger spring. I kept checking and adjusting every parameter of normal running, the engine would start and run correctly until I braked, made a sharp turn, shifted gears or scratched my arse, then it all fell apart, with backfiring, loss of power, etc.
Pull that front timing cover and tell us what you found.
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