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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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