Posted by Janicholson on June 22, 2022 at 16:56:59 from (24.240.46.228):
In Reply to: farmall m hard start posted by Noah Washine on June 22, 2022 at 16:05:00:
Mags make their own electricity by spinning a permanent magnet inside a coil. This electricity is then shut off by a set of points .013 inches opening when the little cam in the mag is pushing the points wide. Shutting off this internal juice causes a high voltage spark. When cranking with a hand crank, or electric starter, the mag doesn't spin fast enough to make enough voltage to fire the plugs. SO the drive that hooks the mag to the engine has a coil spring in it that is used to spin the mag fast when starting. the catch and release of the spring makes a pretty dramatic clicking noise. Pulling the tractor causes the engine to be turning fast enough to not need the spring device. The drive device is called an impulse coupling. If you tractor doesn't click when cranking, I suspect the mag drive needs to be rebuilt. Jim
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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