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Allis Chalmers Discussion Forum

Difficult starting Model B after it has been runni

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03-21-2004 06:24:09

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I own a 1947 Model B that is difficult to start after it has been running for a length of time. It will eventually start again, but I have to wait an hour or so before she fires back up. What could be causing this? Thanks for anyone's help in advance.


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Steve in N.J.

03-21-2004 19:13:56

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 Re: Difficult starting Model B after it has been r in reply to Tom, 03-21-2004 06:24:09  
Usually the updated Epoxy coils are a pale Orange color. Pretty easy way to tell if it's the newer style. We use a hi-wound coil in our rebuilds, for a hotter spark. Some of the revised F/M coils were black with "F/M" stamped on them in Yellow ink. Hope you find your problem.. Steve/B&B Custom Circuits

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Steve in N.J.

03-21-2004 07:18:51

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 Re: Difficult starting Model B after it has been r in reply to Tom, 03-21-2004 06:24:09  
Could be a couple things. If it's mag fired, sometimes a failing condensor causes intermitant problems. Also, if it's mag fired, if the mag is equipped with the older tar covered coil, sometimes as age comes on them, they develop a leakage problem, especially after they've warmed up to operating temp and ground themselves out to the mag housing. An updated epoxy coil would take care of that problem should it be a "no spark when hot" problem. Could also be a fuel related problem. High float level, dirt or sediment from the tank getting in the carb also. A few easy thing's to check. If it turns out that you do find a no spark problem when hot, and you suspect it's in the mag, we service magneto's & have mag parts in stock. Be glad to help ya out... HTH
Steve/B&B Custom Circuits

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03-21-2004 13:49:51

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 Re: Re: Difficult starting Model B after it has be in reply to Steve in N.J., 03-21-2004 07:18:51  
Steve and Jim,

Thanks for the response.

Steve, I had the magneto rebuilt. Would they have installed an updated epoxy coil when they rebuilt the mag? How can I tell?

Jim, would it be wise to run higher octane gas or add some sort of additive to the fuel. I will shut of the fuel valve from this point forward.

Thanks for the advice.


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03-23-2004 16:24:39

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 Re: Re: Re: Re: Difficult starting Model B after i in reply to Jim Danforth, 03-21-2004 19:34:56  
B Hot Run Not; Wash down the coil and wiring set with warm soapy water. Rinse off with cold water throughly. Let dry totally with fan. Swab down the coil top with alcohol. Let dry. Run until it does its typical stop. Heres the hard part, discharge a CO 2 fire extinguisher for 30 to 45 seconds if the B restarts at this point your coil is overheating. Or wait til its twenty below at your locale and see if the engine shuts down under really "cool" conditions. Good luck and lots of fun in your troubleshooting efforts.

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