Farm Equipment - FMX Magneto Disassembly

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FMX Magneto Disassembly

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=9835
Printed Date: 21 Jan 2025 at 6:42pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: FMX Magneto Disassembly

Posted By: wjohn
Subject: FMX Magneto Disassembly
Date Posted: 21 Mar 2010 at 7:27pm

I feel more than a little stupid for asking this, but I am unsure how to remove the cap from the Fairbanks Morse X magneto on my B. When I remove the 4 screws and pull at the cap, it will not come completely free from the magneto frame. I can get about a 1/2" gap between the cap and mag but that is all. I think that there may be a release tab on the inside, or I just have to remove the rotor first somehow? I didn't yank too hard on it because I didn't want to break anything and have to pay for new parts!

I found some diagrams of FMJ magnetos but none of the FMX. It seems that the FMJ cap just comes free but the FMX has a different enough design that I am confused... any advice would be greatly appreciated.

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1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45

Replies:

Posted By: Steve in NJ
Date Posted: 21 Mar 2010 at 7:34pm

The end cap is removed first with the wires on it. (two screws) Remove the rotor, and then you're lower cover will lift off. The rotor is holding it on...
Steve@B&B

Posted By: wjohn
Date Posted: 21 Mar 2010 at 7:36pm

Okay, makes sense. Anything special about removing the rotor, or do I just pull it straight off?

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1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45

Posted By: Steve in NJ
Date Posted: 21 Mar 2010 at 7:43pm

Pull it straight up. Some of them are tough to get off. Don't pry it with a screwdriver. They break easy, then you'll need a rotor. If you need any parts for it, I'm a Fairbanks dealer. Have a lot of parts in stock.......
Steve@B&B

Posted By: wjohn
Date Posted: 21 Mar 2010 at 7:54pm

Alright, will do. Thank you very much!

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1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45