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Tractor Talk Discussion Forum

Magnetos Coils

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Doug in IL

08-31-2006 07:12:05




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Does anyone know what causes a magneto coil to burn up? I have several Fairbanks Morse mags that have burnt coils. Is there anything to do that will help prevent this? Thanks!




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Glen in TX

08-31-2006 09:43:33




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 Re: Magnetos Coils in reply to Doug in IL, 08-31-2006 07:12:05  
Doug, You got excellent answers below from Bob and John on this. Since you didn't say which kind of FM mag or model it could also be the wrong coil in the mag. For some reason FM made some coils for the J & X mags with less windings inside on those orange epoxy coils for 1 cyld. mags only and those coils won't stand up or put out enough fire in a 4 or 6 cyld. mag. There are good aftermarket coils available for less cost for the FM J & X models but not for the other older models. Email if you have questions on the aftermarket coils.

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John T

08-31-2006 07:36:24




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 Re: Magnetos Coils in reply to Doug in IL, 08-31-2006 07:12:05  
Doug, In addition to Bobs good answers, other things that can be hard on Mag coils are running plug gaps wayyyyy y wider then specified and tripping a mag with no load like a spark plug or a plug wire to ground etc attached especially in mags that do NOT have an internal safety gap to short out the voltage spike.

Its good to have any mag vent holes clean n open and humidity n dust n moisture and olddddd age are just tough on 50 year old coils with the old technology insulations like Bob was talking about.

John T

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Bob

08-31-2006 07:30:19




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 Re: Magnetos Coils in reply to Doug in IL, 08-31-2006 07:12:05  
1.) Old age, combined with engine heat, and 50-year-old insulation that, even when new, was weak compared to today's materials.

2.) Damage caused by "blems" who mistakenly connect battery power to the mag's "kill" terminal, not realizing it's self-powered, and can't tolerate being connected to an external source of power.



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