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C Allis Magneto-Spark on only 2 cylinders

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JordanNC

07-27-2008 14:19:00




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I have a '47 C with a Fairbanks-Morse magneto that only has spark on two cylinders. I thought this would be a cap or rotor problem so I replaced both the cap and the rotor (not with a new one, but from another running tractor). I still have the same problem. No spark on the same two cylinders. I have checked the plugs and wires on the two problematic cylinders to see if they work, and they do. Does anyone have any recommendations as to what I should check next? Thank you.

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Steve in NJ

07-30-2008 03:36:21




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 Re: C Allis Magneto-Spark on only 2 cylinders in reply to JordanNC, 07-27-2008 14:19:00  
The problem could be a very weak magnetic field at the magnetic rotor. If that is the problem, re-magnetizing the rotor assembly is the fix. I've had mags come in for repair that had the problem, when I first ran them on the bench, and after a good rebuild and re-magnetizing the rotor assembly, the fire is back at all four holes with a vengence. Another problem F/M had with its early version Mags is the tar-taped coil that was used. These coils would "leak" to where stray spikes would ground to the inside of the Mag housing and either kill the engine or kill a cylinder or two. HTH
Steve@B&B

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Kip-Utah

07-28-2008 20:48:28




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 Re: C Allis Magneto-Spark on only 2 cylinders in reply to JordanNC, 07-27-2008 14:19:00  
Are you sure that it's not a John Deere mag?! LOL



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Kentb of SWMO

07-27-2008 15:06:45




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 Re: C Allis Magneto-Spark on only 2 cylinders in reply to JordanNC, 07-27-2008 14:19:00  
Has someone installed one of the solid-state chip that replace the points and condenser? If so this will cause it to fire on anly two cylinders. It will fire, skip, fire and skip.

Kent



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El Toro

07-27-2008 14:31:16




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 Re: C Allis Magneto-Spark on only 2 cylinders in reply to JordanNC, 07-27-2008 14:19:00  
Have you checked the lobes on the mag for being worn flat? See if there's any slop in that mag's shaft with the lobes. Hal



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