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Farmall & IHC Tractors Discussion Forum
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Dave H (MI) ScottyHomey

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Janicholson

09-30-2007 13:42:18




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I need to make sure of a component in the descriptions given on page 2 about Magneto action.
The magneto has two sets of coils in it just like a regular coil. The primary is saturated with magnetism from the rotating internal magnet. The saturation of this coil with moving magnetic lines causes voltage and current to flow making a strong magnetic field around the secondary windings. This voltage/current is then collapsed by the breaker points opening just like a regular coil. The collapse of the magnetism in the primary induces high voltage in the secondary making spark. A mag has just as much chance of making extreme voltages as a coil system. It depends on how much is needed for reliable performance and starting. Modern mags (and others not on farmalls can have advance mechanisms on them to allow better timing, the ones on Most old tractors didn't. So the only real difference is the mag gets its electricity for the primary by generating it in the primary with a permanent magnet. Where the coil system gets its electricity from the battery/charging system. Just being very clear. JimN

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El Toro

10-01-2007 04:46:09




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 Re: Dave H (MI) ScottyHomey in reply to Janicholson, 09-30-2007 13:42:18  
third party image

Here's an old Wico mag off a twin cylinder garden
tractor with dead magnets. Hal



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Cedric

10-01-2007 01:58:42




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 Re: Dave H (MI) ScottyHomey in reply to Janicholson, 09-30-2007 13:42:18  
A good scource of information on how magnetos work can be obtained from the IH "Blue Ribbon Service Manual" for magnetos. The opening chapters contain the basic principles of magnetism and electricity as applied to magnetos. It then continues with full details of procedures for servicing and testing the various magnetos that were used on IH equipment.

My Manual has the publication number GSS-5035, November,1971, which is a reprint from the original CHS-27, 1947. Sid.

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Dave H (MI)

09-30-2007 15:27:20




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 Re: Dave H (MI) ScottyHomey in reply to Janicholson, 09-30-2007 13:42:18  
Thanks Jim! I will put that as an addendum to my archive on the subject. The 2N I will be working on if I ever shake this rotten cold has a 6 volt positive ground system but, if memory serves me, it is a front mount distributor AND a generator.
The TD6 is even more hairy and I am just starting to delve into that. Believe it has a mag and generator. I am REALLY getting into this stuff. Found myself spending most of the weekend in bed with a box of tissues and my service manuals. I love to learn new stuff!

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ScottyHOMEy

09-30-2007 14:48:34




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 Re: Dave H (MI) ScottyHomey in reply to Janicholson, 09-30-2007 13:42:18  
Thanks, Jim! That helps my grasp of it quite a bit. I'd had the concept in mind for a while but never could line up all the parts. In my mind (just from what I can see on an H4 - the only mag I've ever been into the guts of) I'd thought the outer coil was the one saturated by the magnet that looks to surround it and a coil turning inside that.

I'll keep puzzling but your post is helping as long as I don't overthink it. Thanks again for following up!

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El Toro

09-30-2007 13:51:56




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 Re: Dave H (MI) ScottyHomey in reply to Janicholson, 09-30-2007 13:42:18  
That's why you need to check thos old mags magnetism. They sometimes lose that magnetism. Just like us old men. Hal



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