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Allis Chalmers Discussion Forum

FM X4B11 Magneto on '39 B

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Glenn in PA

08-08-2003 04:58:18

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Noticed the mag on my "new" tractor is a FMX4B11. This tractor is a 1939. Is it original or was it put on as a "fix"? Manuals call for a different FM mag, but it also notes "sub for" another Allis Part number that is discontinued. Anybody have an idea what this mag would normally be used on? I assume it will work, as it seems to have been on the tractor for a while....

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Steve in N.J.

08-08-2003 19:30:40

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 Re: FM X4B11 Magneto on '39 B in reply to Glenn in PA, 08-08-2003 04:58:18  
Glenn, Rod is right on the money there. The "X" series mags replaced the "J" as Rod mentioned. When Fairbanks released the "X" series all the "quirks that the "J" had were gone. One big revision with the "X" series is, when the cover is lifted off, the internal timing gears are both mounted to the point contact plate, where the "J" one of the timing gears came off with the cover. This became troublesome when it came time to re-assemble the mag and put the gears back in time. A couple other major improvements were magnetic rotor, & an epoxy coil. So, you actually have the best model of the bunch! If you ever need any parts or service for your F/M mag, drop us a line, we have parts & we service them too. Be more than happy to help ya out...
Steve/B&B Custom Circuits

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Glenn in PA

08-09-2003 16:46:12

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 Re: Re: FM X4B11 Magneto on '39 B in reply to Steve in N.J., 08-08-2003 19:30:40  

I pass through Jersey on I-80 a couple times a month. If I get through earlier in the afternoon, I may stop by and say hi. Thanks for the info.


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Steve in N.J.

08-10-2003 19:15:17

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 Re: Re: Re: FM X4B11 Magneto on '39 B in reply to Glenn in PA, 08-09-2003 16:46:12  
Glenn, Give us a "jingle" if you plan on stopping by sometime. Love to meet ya and give ya a tour of the shop & talk Orange! We're about 10 minutes off of I-80, via Rt-15 North to Oak Ridge. Steve/B&B Custom Circuits

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Rod (NH)

08-08-2003 14:28:34

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 Re: FM X4B11 Magneto on '39 B in reply to Glenn in PA, 08-08-2003 04:58:18  
Hi Glenn,

It's not original to that tractor. My understanding is that the FM-X4B is a newer version and a direct replacement for the FM-J4B. The FM-J4B was the original mag on the B, although I am advised that there were some that used a WICO. I have replaced the original FM-J4B on my '42B with an NOS FM-X4B. It works fine.

third party image Rod

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Glenn in PA

08-09-2003 16:44:50

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 Re: Re: FM X4B11 Magneto on '39 B in reply to Rod (NH), 08-08-2003 14:28:34  

Thanks for the info. By the way, this machine also has a belly sickle mower as well. Thanks again for the manual and tips you gave me last year, this one is in better shape than the one I have. I may take you up on the offer you made last year for a tracing of that swathboard. Talk to you later.

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