It could be rust or dirt that's not allowing the snapping action on the impulse when cranking. It could be the the spring is broken or where the fingers contact the posts are worn not allowing the impulse coupling to "windup" to get the snapping action with the hot spark when cranking.
If you ever decide to pull the mag you need to pull the cap and see where your rotor is pointing and make a sketch. Once you pull the mag don't ROTATE the engine. When the mag is repaired you rotate the rotor shown in your sketch and install the mag and your engine should start. The same applies to a distributor.
You should contact 'Jon the Magman' at www.farmallall.com and ask him his opinion since he rebuilds these mags. Hal
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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