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Allis Chalmers Discussion Forum

AC WD Magneto

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Steve Stoppelman

09-14-2007 22:17:50

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I have a magneto on my AC WD that is getting some spark, but I don"t think enough to start it. I have read on the forums to start by replacing the condenser. Does anyone know where I can get a condenser for it? Also, what other parts should be replaced to try to make this work? I left it outside for a couple of months and now it won"t start, I am thinking it may have gotten wet.

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09-15-2007 08:13:28

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 Re: AC WD Magneto in reply to Steve Stoppelman, 09-14-2007 22:17:50  
Do you have a manual for the mag??? If not send me and e-mail and I'll send you one. I have both manualls for both mags that might be on it so you will need to tell me which one you have. Also when its turning over do you here the impulse dogs tripping if not that could be where your problem is

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El Toro

09-15-2007 04:32:08

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 Re: AC WD Magneto in reply to Steve Stoppelman, 09-14-2007 22:17:50  
Pull the cap off the mag and check the cap for any moisture. If there's moisture present wipe with a clean dry rag. You could try Napa auto parts for a condenser. The Borg Warner part number on the condenser is G102A. I would clean those points with some 320 wet or dry too.

Your coil may be getting weak or the magnets in your mag may be getting weak. The magnets are what creates your spark when they pass by the coil. They sometimes lose their magnetism and an easy way to check this is to touch a flatblade screwdriver on the magnets and see if they attract that screwdriver with a lot of effort.

If the magnets check out ok, it could be your coil
and you should have a hot blue spark when the mag is firing. Hal

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Steve Stoppelman

09-16-2007 11:07:41

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 Re: AC WD Magneto in reply to El Toro, 09-15-2007 04:32:08  
The magnets attract a screwdriver but I wouldn't say with a lot of effort. I don't have anything to compare it too, so I am not sure if the magnets are getting weak or not. I suspect they are because I am guessing my spark is too weak. Also, my coil must be original because it looks like it is riveted in. How do you replace it and could I also get one of those at NAPA. If my magets are weak, what are my options? Thanks for all your help, it is much appreciated.

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stu (ON)

09-17-2007 06:40:06

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 Re: AC WD Magneto in reply to Steve Stoppelman, 09-16-2007 11:07:41  
There is no need to guess if your spark is too weak. Pull a sparkplug and ground the base with a clip and wire to the tractor frame. Shade the plug and turn the crank or spin the starter. If you get a visible spark, that is likely enough to at least fire the tractor up for starters. The old FM mags only put out 8,000 volts or so at their best, but it is enough with the low compression engines. It is important that the spark plugs be clean, non-resistor type for this reason. Also, the plug wires should be pure copper core, not the automotive carbon suppression type. If you don't have spark at the plug, get Old's manual or download it from the link below and follow their troubleshooting procedure. You can basically start at the outer cap and work your way in, looking for spark. If you have it at the cap, but not the sparkplugs, you have plug or wire problems. If you don't have it at the cap, but the internal copper rod gives a jolt, you have rotor or cap problems. If no spark at the copper rod, then you need to get into the condenser & points, or maybe even the coil. Those items you could replace. You will want to read up on timing the mags internal parts. If that wouldn't do it, you need someone who works on the mags regularly, such as Steve Barbato at customcircuits@gmail.com. The coil should not be riveted in, but held in by set screws that are removable. However, I have seen them chewed right up by previous removal attempts, and then you are in for a lot of work with drills and EZ-outs, or similar. Try a little heat and lots of penetrating oil.

But, unless you really want learn how a mag works, start at the sparkplugs and work your way in. If you have spark at the plugs, look elsewhere for the starting problems, like water or dirt in the fuel line. Doesn't take too much spark to at least get a kick from the engine.

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09-16-2007 15:09:53

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 Re: AC WD Magneto in reply to Steve Stoppelman, 09-16-2007 11:07:41  
On-line sources or dealers have coils- usually about $60. Magnets can be re-magnetized with proper equipment.

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El Toro

09-16-2007 11:27:52

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 Re: AC WD Magneto in reply to Steve Stoppelman, 09-16-2007 11:07:41  
third party image

I think Napa may have a coil. If you have battery start on your tractor you can convert your mag to a distributor. You would need an ignition switch, automotive type coil and use your the points in the mag. You will need wire from the switch to the coil and from the coil to the points. Disconnect the old mag's coil wire at the points and any grounding strap to ground out the points. You can put some thought into this. You don't need to remove the mag either.

Here's a Farmall that's been converted. Hal

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