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Allis Chalmers Discussion Forum

C Mag Burning Up Condensers

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Ky Cooter

08-18-2003 06:22:57

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I traded for a 1948 Allis "C" that had been sitting in a barn for 8 years. Ran fine when parked. Cleaned and reset points, new plugs, good gas flow, ect. It will run when I install a new condenser, but the next day, no fire? I have replaced condenser 4 times already. It will start and run with new condenser. It has the Fairbanks Morse type FMJ 4B3 magneto. What could be burning up the condensers?
Thanks in advance.

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08-18-2003 20:13:58

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 Re: C Mag Burning Up Condensers in reply to Ky Cooter, 08-18-2003 06:22:57  
Steve in N.J. I could use the address also. as I am just getting to that part of my restore project


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Steve in N.J.

08-18-2003 06:49:34

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 Re: C Mag Burning Up Condensers in reply to Ky Cooter, 08-18-2003 06:22:57  
Ky, We do quite a bit of F/M mag repair. Sounds like it could be a weak magnetic rotor, or possibly a weak or failing coil. On earlier model F/M4B3 mags, Fairbanks used to use a tar wrapped coil. These coils would "leak" and either go to ground or eventually fail. The fix in the later model 4B mags was an epoxy tighter wound coil which was more reliable and eventually eliminated the leakage and weak spark problems. They used that particular coil right into the "X" series mags. If your 4B is equipped with the tar wrapped coil, that could possibly be yer' culprit. The other problem I mentioned earlier, is a weak magnetic rotor which would also cause a very weak spark. This would eventually take out the contacts or condenser. The fix for that is re-magnetizing the rotor assy which a mag shop can do. We carry F/M replacement parts in stock and also have an exchange program on mags if your interested. Drop us a line, be glad to help ya out.... HTH
Steve/B&B Custom Circuits

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Rich, NJ

08-18-2003 07:13:05

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 Re: Re: C Mag Burning Up Condensers in reply to Steve in N.J., 08-18-2003 06:49:34  
Dear Steve, In a previous post, I asked you to email me an address. You didn't answer. I'm sorry but "Steve at B&B custom circuits" just doesn't get it through. You say you have the front wheel lugs that I need. and Now I find I need a Mag cap for my FM. There's probably a few other things I can use as well. I've tried emailing you but you blocked the address. What do I do? Regards, Rich.

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Steve in N.J.

08-18-2003 10:17:13

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 Re: Re: Re: C Mag Burning Up Condensers in reply to Rich, NJ, 08-18-2003 07:13:05  
Sorry Rich, just saw yer' post this mornin'...
I e-mailed ya. Ya got all my #'s, sites etc. now.
Talk to ya.. steve

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Dick L

08-18-2003 06:48:35

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 Re: C Mag Burning Up Condensers in reply to Ky Cooter, 08-18-2003 06:22:57  
Did you install new points? If not put one of the old condensers back in and see if it will start then. I would guess that you have a point problem and when removing the condenser you move the points around and make the contact points connect to ground. I have never had a condenser that went bad in a magneto and I do know that they can and do go bad. I have to file the points on two of my B's every spring. I think that is because both could use a new gasket between the cover and the housing. Moisture tends to then crud up. The other B's and C have never been opened up from the time I rebuilt them.

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Ky Cooter

08-18-2003 12:27:31

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 Re: Re: C Mag Burning Up Condensers in reply to Dick L, 08-18-2003 06:48:35  
Thanks guys for the info. I talked to a different partshouse today and they said a FM mag takes a different condenser than what I was using! So I ordered new points, condenser, and autolite 295 plugs. New parts will be in wednesday. Hope that cures my problem. Will let ya know.
Dick, I tried old condenser with no luck. Steve, send me ya site or e-mail addy.

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Dick L Yup

08-18-2003 13:48:22

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 Re: Re: Re: C Mag Burning Up Condensers in reply to Ky Cooter, 08-18-2003 12:27:31  
Sounds like ya found the problem. Make sure you clean under the points so they ground out well. Quite a while back a feller was having a problem with no spark and found that when he rebuilt the mag or distributor that he painted the plate under the points. Looked real good I bet but the paint insulated the points from grounding out. Oily dirt and rust will do the same thing.

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