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John Deere Tractors Discussion Forum
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1939 JD D Edison Splitdorf Magneto

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B Duncan

02-21-2005 12:10:28




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Hi Goup,
I am finally getting around to fire my D up for the first time since I have had it. It had been sitting dormant for many years and I have installed new fluids, plugs and wires and rebuilt the carb. It has a very weak spark while rolling the flywheel forward. It does not snap on impulse. The mag is a Splitdorf and I do not know much about these mags or mags in general. My shop book doesnt show a break down of this model or offer any advice. Not knowing much I have only taken off the bakelite cover and looked at the brass rotor. I did notice that there is a terminal on the top where a wire might be placed. What is this for? Is this type mag rebuildable? What could cause it to lose the spark? Or would it be better to buy a Wico replacement. Sorry to be longwinded but I really appreciate all the help and advice.

Thanks again B Duncan

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Duane Larson

02-21-2005 18:40:27




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 Re: 1939 JD D Edison Splitdorf Magneto in reply to B Duncan, 02-21-2005 12:10:28  
B Duncan,
Your D came with an Edison Splitdorf CD Spec 0010 magneto - and they are rebuildable. They are a good magneto in my book, as they have some adjustments that cheaper Wico and Fairbanks Morse magnetos don't have. You should hear a "clunk" rather than a snap when the impulse releases, as the AA impulse unit uses a long compression spring to store the energy during starting, and these impulse units sound different than those which use a big clockspring. If you do not hear this sound, the spring is likely broken and that will reduce the intensity of the spark at starting rpm. The impulse unit has two functions - to retard the spark at impulse speed during starting, and to rotate the magnetic rotor fast when the impulse trips to increase the spark intensity during starting.

The top terminal can be wired to a grounding button to ground the primary side of the coil and kill the spark to stop the engine.

If you decide you want a Wico replacement, you will want an XH477, which comes with the long drive lug. But I would opt to fix the Edison.

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B Duncan

02-22-2005 03:59:23




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 Re: 1939 JD D Edison Splitdorf Magneto in reply to Duane Larson, 02-21-2005 18:40:27  
Thanks for the advice. I will try and rebuild it and see what happens.

Thanks again
Brad D



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