Farm Equipment - Magneto model #'s for B/C

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Magneto model #'s for B/C

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=169927
Printed Date: 24 Aug 2025 at 1:01am
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Topic: Magneto model #'s for B/C

Posted By: Luke114
Subject: Magneto model #'s for B/C
Date Posted: 08 Apr 2020 at 11:49am

Anybody know of resources for looking up differernces in model numbers for Fairbanks magnetos? I have a B with model J4B3, but also looking for another to repair a C. Are there multiple models I can look for? Not looking for something that is correct for restoration, just something that fits the flange and works.

Replies:

Posted By: PaulB
Date Posted: 08 Apr 2020 at 12:48pm

I have a couple Magnetos that are for an AC taken off running motors, $150 each

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If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY

Posted By: GreenOrange
Date Posted: 08 Apr 2020 at 2:32pm

FMJ, FMK, FMX, FM - and several other brands that made replacement units for the original Fairbanks-Morse magneto. Just be sure to verify rotation and impulse angle.

Posted By: everett048
Date Posted: 08 Apr 2020 at 2:39pm

4B3 is the Fairbanks Morse figment no for A C

IE FMJ 4B3

Posted By: HoughMade
Date Posted: 08 Apr 2020 at 2:55pm

The mag on my B (1951) is indeed an F-M, FMJ 4B3

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1951 B

Posted By: MACK
Date Posted: 08 Apr 2020 at 9:25pm

I have one just took off running engine . 50 $. MACK