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Tractor Talk Discussion Forum

Magneto Model A John Deere

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Jason

07-21-2004 19:47:19




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How can You tell if A magneto is bad or Good. The one on my Model A is a Wico brand. The Starter will not work. I really would like to know what all I am getting into before spending a lot of money on Having the starter fixed. I am new at tractor collecting as for as restoring one goes. I am really new at this magneto stuff.




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Robert

07-22-2004 07:09:06




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 Re: Magneto Model A John Deere in reply to Jason , 07-21-2004 19:47:19  
I got to thinking after I posted the earlier response. I told you how to check magneto output at the magneto. You can just pull the plugs, lay them against the block, turn the engine over, and you should see a bluish spark each time you hear the impulse coupling on the magneto "snap". If you don't hear the "snap", then there's a problem with the impulse coupling, and you'll have to take the magneto off to correct the problem. If you hear the "snap", but see no spark, then you will have to investigate---plugs, wires, dirty cap/rotor, point gap, etc.
Do the tests, and post back with what you find. There are lots of good folks on this board who will gladly steer you through any problems you find....

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Robert

07-22-2004 06:39:05




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 Re: Magneto Model A John Deere in reply to Jason , 07-21-2004 19:47:19  
Probably the easiest way, is to take the cover off the magneto, pull the spark plugs (so that you can turn the engine over by hand easier), then, take a paper clip, attach it to the magneto case with a screw, and bend the paper clip so that it is about 3/16" away from the metal contact on the coil. Then, get a friend to watch the space between the clip and coil as you turn the flywheel forward, you should hear a "snap" as the flywheel comes around at "LH Imp", and again 180 degrees later. A decent spark should also be visible each time you hear the snap, which is the impulse coupling on the magneto.
If you have spark there, then you can assume the magneto is working, put the cap back on, and check the spark plugs....
Good Luck!

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