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Allis Chalmers Discussion Forum


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Author  [Modern View]

03-18-2017 13:45:22

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I have a Ford 2N. Got a ? on a mag. I bought a used mag on line its a FM J4B73 that is the # stamped in the metal housing and that is the # For the mag on this Ford. The one side of the housing and plastic cover has best I can tell AC orange paint sprayed on it. I know some AC takes a J mag so could this be off a AC?

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03-28-2017 06:52:19

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 Re: FM Mag ID in reply to L.B,, 03-18-2017 13:45:22  
The FM number for Allis Chalmers is FMJ4B3 or FMX4B3

An IH H4 and a Case JMA or model 41 will also work on an Allis.

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stu (ON)

03-19-2017 06:09:34

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 Re: FM Mag ID in reply to L.B,, 03-18-2017 13:45:22  
Look at the FM mag mounted in the pic in this thread and think about how you will convince an AC owner that this is the mag for them.



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03-19-2017 13:47:32

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 Re: FM Mag ID in reply to stu (ON), 03-19-2017 06:09:34  
stu the mag comes off the adapter and when its off it looks like your photo. With the mag off the adapter it might bolt onto a AC. While on the adapter it would be a hard sell LOL-----------.I was just curious if the mag on the Ford adapter may have come off an AC due to orange paint on it. The Ford mag is useless without the adapter and they are a rare find. I will just buy a mag that was used on an AC and see if they might be the same. Thanks for your input.

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stu (ON)

03-18-2017 18:19:34

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 Re: FM Mag ID in reply to L.B,, 03-18-2017 13:45:22  
third party image

Here is a pic of the typical FMJ4B used on AC. Does yours look the same? Same lag angle? Same direction of rotation (CW)? Same drive lugs? The retaining nut in the pic would normally be screwed down flush.

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03-18-2017 22:20:17

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 Re: FM Mag ID in reply to stu (ON), 03-18-2017 18:19:34  
third party image


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03-18-2017 22:14:14

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 Re: FM Mag ID in reply to stu (ON), 03-18-2017 18:19:34  
Lugs yes but lugs on the adapter key to cam and they go only one way due to their width it cant go in 180 wrong but some have managed to force in wrong when mounting the distributor lugs, you take the dist off to change point and cond. The cam can also drive a front mount distributor without any adapter. The mag was used during WWII 1942-1943 it eliminated the use of copper and battery no lights,no starter, it is hand crank start. The drive lug can be changed I bet, and if I remember right they turn CW but dont bet the farm on my memory. Anyway a J may be J with a slight different drive. You can see the orange paint on it????

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stu (ON)

03-18-2017 14:35:29

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 Re: FM Mag ID in reply to L.B,, 03-18-2017 13:45:22  
It's Ford.


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03-18-2017 16:48:21

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 Re: FM Mag ID in reply to stu (ON), 03-18-2017 14:35:29  
Ok I know the number stamped on it is Ford I was wondering if it would screw onto your ACs as well with an adapter of some kind due to the orange paint on it. Fords were Dark Gray or 2 tone Red/ very light grayish cream but not orange /not to say I have seen where somebody painted a Ford different color. As we say its your tractor and ya can paint it any color ya want. I have bought a bunch of mags and just thought by chance I could go either Ford or AC when I sell them.

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03-27-2017 05:53:19

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 Re: FM Mag ID in reply to L.B,, 03-18-2017 16:48:21  
FM mags. will fit lots of different engines , but allis was a big user of those mags. so most end up with orange paint , ive actually use an IH mag. on my WD allis in a pinch , bottom line if it bolts on , spins the proper way it will most likly work even if it isnt the right mag.

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