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Allis Chalmers Discussion Forum
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ffreeb

12-02-2007 03:29:33




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I have a wc that quits when it gets warm. I winder if something might be wrong in the magneto. any ideas?




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DARDAN

12-04-2007 17:46:30




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 Re: wc in reply to ffreeb, 12-02-2007 03:29:33  
I have had a fair amount of failure of the FM 200 condensers that I bought from NAPA. Work fine for a while, then get tempermental when hot. These are for Faibanks- Morse FMJ magneto.



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Jerry Coulter

12-02-2007 11:49:48




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 Re: wc in reply to ffreeb, 12-02-2007 03:29:33  
Before you do those other diagnostics, loosen the gas cap and see if you have vacuum when it dies. Maybe the vent is clogged.



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old

12-02-2007 07:37:59




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 Re: wc in reply to ffreeb, 12-02-2007 03:29:33  
You say warm, are you saying 15 minutes or an hour?? If its an hour it could be a weak coil in the mag or it could be the fuel line is getting hot and vapor locking. You need to check for spark and fuel the moment it dies and not let it cool be for trouble shooting your problem



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1000yds

12-02-2007 07:00:48




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 Re: wc in reply to ffreeb, 12-02-2007 03:29:33  
Been a problem on the Allis for years. Usually if you put a couple coils in the fuel line the problem of "boiling" the gas will go away.



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George Andreasen

12-02-2007 05:32:06




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 Re: wc in reply to ffreeb, 12-02-2007 03:29:33  
Check for fuel starvation as soon as the engine quits. If there's plenty of gas, pull a spark plug wire and have someone crank it over while you hold the end close to the block. If no spark there's a good chance the condensor in the mag is faulty. These are about the only two things that will stop an engine so quickly.



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LenND

12-03-2007 14:40:17




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 Re: wc in reply to George Andreasen, 12-02-2007 05:32:06  
I agree with George you very rarely here of a mag going bad on a WC. At least I haven't but they are very fussy when it comes to fuel. They are easy on gas so it seems it doesn.t take much to slow the flow. I can remember getting some water in the gas and spending more time draining the carb than working,



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Texas Denny

12-02-2007 03:58:48




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 Re: wc in reply to ffreeb, 12-02-2007 03:29:33  
I would guess gas supply. Make sure you get a good steady flow of fuel out of the carburetor base (should be a drain on it) for at least a couple of minutes. You can save the fuel in a clean container and put it back in the tank. It is quite common for particles of rust or whatever to be in the bottom of the tank. When the tractor moves or even standing still because of vibration, these particles move over and restrict fuel flow, starve the tractor until it finally dies. Let set a while, and it will again start - low flow fills the settling bowl and the carb after a bit. It will run again for a while until process repeats. Had this on a half dozen antique tractors.

While there may be a problem in the mag, it is more rare - never seen it myself.

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