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Farmall & IHC Tractors Discussion Forum
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IH magneto of Farmall MD

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Dick

11-28-2003 20:47:31




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ok heres the deal...i have a MD with a IH mag....the tractor was running on gas as i was letting it warm up to swicht to diesel..and then it died....i replaced the coil and condenser...still not enough spark....i took it off again...stuck in vise...then i put a varible speed drill with 11/16 socket and slowly ran it....as the rpm got up there.(much faster than engine turns over)...i could get a good arch with a screwdrive crossing out the tip on the coil...but when i run it slow...the spark is nearly non existent....and a curios thing ...when i have it on the tractor....and i am turing over the engine....if i hold a screwdriver by the side of the mag...where the wire comes down from the air intake manifold (shut off swicth)..and i get it to ark...then i can get the tractor to fire...i am assuming this is jumping the voltage to the point i am getting enough juice to spark the plugs.....so the question....what could have gone wrong with my mag....i would like to keep it oringinal.....thanks for any help

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ja0091

11-29-2003 09:03:58




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 Re: IH magneto of Farmall MD in reply to Dick, 11-28-2003 20:47:31  
i think you possibly have two problems. since the MD magneto turns opposite rotation to gas engines, the rotor pinion and drive gear should have the beveled teeth and L mark aligned. you are grounding the magneto coil when you place the screwdriver on the terminal that goes to the intake manifold, then ground the screwdriver. i think you get a spark because at that time the points are open, and you complete the circuit.
so, check that you assembled the rotor correctly. if that works, and you still have no spark at low rpm, but it works at higher rpm, the impulse coupling must be defective.
i assume you are turning the mag the correct rotation with the drill!!!!!

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