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Allis Chalmers Discussion Forum
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Dead WD

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Doug L

01-15-2006 21:00:16




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I have a 1953 WD and have been having a hard time starting it in the wet Orgeon winter. The other day it was very hard to start and was missing and sputtering and finally dies. I was cranking it over to restart it when a spark arched on the positive battery terminal (positive ground)and the ignition went completely dead. I mean it was like it fried the battery, because it would not turn over one little bit. Completely dead. It has the original 6V system. I got another battery and that worked fine (it turned over again) but still would not start. Looked at it today and see that it has no spark now either. Looks like that arch fried the mag too. I know it lost the spark at the same time as that first battery went completely dead. Points and rotor in the mag looked good but no spark. Could I have burned up the coil? This tractor has ran fine for a couple years just as it was. The hard starting I believe is a carb problem, but this arch seemed to come out of the blue. Any thoughts??? I have done no rewiring to the tractor before this happened. I had been cranking it for quite awhile when it arched. Thanks Doug

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BCnT

01-16-2006 06:23:03




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 Re: Dead WD in reply to Doug L, 01-15-2006 21:00:16  
that arc was more n likely caused by dirty connection at battery terminal...high humidity means clean terminals often...since tractor died before the arc took place i'd say theres a good chance your coil or condensor died first...if coil was weak chances are your plugs are fouled too...if gas isnt running out of carb i'd rule it out...one other thing about high humidity is keep a can of wd 40 or wire dry handy and spray dist cap and wires anytime you see condensation on tractor.

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Doug L

01-15-2006 22:14:10




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 Re: Dead WD in reply to Doug L, 01-15-2006 21:00:16  
You both have made worthy comments. After posting I thought of the condensor myself, but as Old suggests, the battery system has nothing to do with the magneto. It is indeed a mag system. Fairbacks Morse. The only purpose of the battery has is to turn the starter. The mag makes it's own sparks. One doesn't need the other. The whole seen is even more weird when that is all considered. May be a big coinsidence that I lost the spark at the same time the battery arched. I just had the cables stuck on the battery and maybe were not tight enough to contact. Once it arched and created more of that sooty glaze that's why the battery lost all contact. But, why did I loose the fire too. I think I'll try a new condensor just for a cheap attempt. Old I know what you mean by checking the spark the hard way but I grounded a plug to the frame and can reach the starter pull from there and turned it over on two different plugs to determine that no fire was there. What a weird day.

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BCnT

01-16-2006 12:44:38




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 Re: Dead WD in reply to Doug L, 01-15-2006 22:14:10  
mag or distributor...they both have coils,points and condensors and ALL of them go bad at some time or another.
condensor and file points first...thats the cheap stuff.



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David in Mo

01-16-2006 04:55:53




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 Re: Dead WD in reply to Doug L, 01-15-2006 22:14:10  
On my '52 WD I always disconnect the ground wire from the mag when I start it. There is a slight and I mean VERY slight voltage leakage across the insulated gounding post across ALL mag's .



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J.C. IN AZ.

01-15-2006 21:41:39




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 Re: Dead WD in reply to Doug L, 01-15-2006 21:00:16  
I had an early 50's WD but had a Distributor for ignition. It too was 6 volts system. Check again,if it has a Distributor try a new Resistor. it may be burned up, or you have a serius Short in the system.The Cap, Rotor and Points plus the Resistor must all be funtional for a spark. check Plugs. Full charge Battery and check wiring and start Switch for ground.



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J.C. IN AZ.

01-15-2006 21:46:17




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 Re: Dead WD in reply to J.C. IN AZ., 01-15-2006 21:41:39  
It has been a long time since I fooled with one of these,I meant a "Condensor" instead of a Resistor.



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old

01-15-2006 21:37:48




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 Re: Dead WD in reply to Doug L, 01-15-2006 21:00:16  
Are you sure it has a Mag????? If it does then what ever happen to the battery would not do any thing to the mag. Mags and batterys are not hooked up in any way shape of form. You probably have a distutor ignition and since your where its very wet I'd guees your cap and or rotor are bad/wet. I'd replace them both. There is a way to check them but its not fun to do but it works. With it out of gear tunr the engine over with the ignition one and hold on the the distutor cap. If it zaps the blank out of you then you have a bad cap.

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