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Farmall & IHC Tractors Discussion Forum
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Wet magneto

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ffolkes

08-27-2004 18:09:40




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Hello-

Well, I found out why I'm not getting a good spark. I took the coil cover off, and there's a lot of water in there. Nothing pooled, but everything looks like a cold pipe on a humid day...beads of water all over.

Funny thing is, the first thing I thought to do when this all started was to open the cover and check inside, but I convinced myself it wasn't necessary.

What do you recommend I do? Gently blow it out with a compressor and see if it helps? Or do I have to take it apart? I even printed the magneto service manual from the “cleancomputes.com” Cub website.

I knew when I took that magneto off I was asking for trouble. ;)

ffolkes

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Mark B

08-28-2004 05:21:10




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 Re: Wet magneto in reply to ffolkes, 08-27-2004 18:09:40  
You might try the ladys hair dryer, but better clean it up after your done:)



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Gene

08-27-2004 22:08:57




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 Re: Wet magneto in reply to ffolkes, 08-27-2004 18:09:40  
Use the exhaust from a vacuum cleaner. The vacuum cleaner exhaust will heat up after a short while. Just set the magneto on the bench, brace the hose so that it blows on - into the magneto, let it run for several hours.



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RussR

08-28-2004 16:43:02




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 Re: Wet magneto in reply to Gene, 08-27-2004 22:08:57  
Gene is rite; Dry out the magneto with dry cloth or paper towel(lint free if possible. Wipe down most of the reacable surfaces with alcohol. Take a 1000W small space heater or hair dryer and group the magneto components to receive this drying breeze for an hour or two. Repeat this procedure as needed if the the humidity remains very high in the tractor/beast area. This is one time were it is best to go dry up(the magneto).

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Nebraska Cowman

08-27-2004 19:21:25




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 Re: Wet magneto in reply to ffolkes, 08-27-2004 18:09:40  
I'd wipe it out and leave it on top of the water heater or some other warm place over night.



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ffolkes

08-27-2004 19:52:24




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 Re: Wet magneto in reply to Nebraska Cowman, 08-27-2004 19:21:25  
Inside the magneto there"s a long tube that looks like it"s a resistor of some sort? With it mounted, and the fan to my right, it"s on the leftmost side of the magneto next to the coil. It"s white and crumbling. It was like that last year when I took the cover off, so I know the water didn"t cause it. Is it normal for it to look like that?

I"m guessing the iron core people speak of is what I see moving at the bottom - it has two lobes that snap past every impulse. They look clean, but I don"t know about the side they oppose.

What is the normal spark jump distance from directly off the magneto? Like I said in a previous post, mine averages about 1/8". It"s always blueish white, never yellow, but sometimes it seems really strong, and other times I"m lucky to get 3/32".

Thanks.

ffolkes

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Gene

08-29-2004 02:51:13




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 Re: Wet magneto in reply to ffolkes, 08-27-2004 19:52:24  
If I understand correctly. That long tube that looks like a resister is the condensor - capacitor. It is not supposed to be white and crumbling. If the condensor is breaking down you are probably getting some arching at the points.

You are a bit short on the spark. About twice that distance would be great.

Minimum, I would replace the condensor and the points then check the quality of the spark. Depending on your confidence and mechanical ability, I would just purchase a kit; points, condensor and coil and rebuild the whole thing. This will save another tear down if the coil is weak or breaks down after the tractor warms up.

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