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Allis Chalmers Discussion Forum
:

Difference between Fairbanks Morse Magneto's

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salfonsi

11-13-2014 18:11:23




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What is the difference between a Fairbanks Morse Type FM-j4b3 and a Type FMJ - 4b3a? Allis Chalmers C - 1949




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Jerry Coulter

11-16-2014 18:08:38




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 Re: Difference between Fairbanks Morse Magneto's in reply to salfonsi, 11-13-2014 18:11:23  
The FMJ4b3 generally fits the B,C,WC and WD. The FMj4b3a fits the late WC which has the kill rod next to the choke rod. The model FM magneto has a 1 piece cap whereas the FMJ has the 2 piece cap.



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salfonsi

11-16-2014 18:13:22




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 Re: Difference between Fairbanks Morse Magneto's in reply to Jerry Coulter, 11-16-2014 18:08:38  
thank you...



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tractorguy2

11-14-2014 07:16:48




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 Re: Difference between Fairbanks Morse Magneto's in reply to salfonsi, 11-13-2014 18:11:23  
I think the j4b3A has a slightly different lag angle. Most have the lag angle marked on the paw plate.

some mags had the "kill" terminal on the left side for the lever kill and some had the "kill" terminal on the right side for the push button. Either they are still a type FMj3b4.

There is a later version type FMx3b4



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Mr. T. Minnesota

11-14-2014 04:41:56




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 Re: Difference between Fairbanks Morse Magneto's in reply to campcy, 11-13-2014 18:11:23  
Quoting Removed, click Modern View to see

S,

Check with Standard Magneto in Chicago, Ill. You should be able to find them on the internet. They should be able to answer your mag questions. HTH

Mr. T. Minnesota



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wilson ind

11-28-2014 16:03:11




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 Re: Difference between Fairbanks Morse Magneto's in reply to Mr. T. Minnesota, 11-14-2014 04:41:56  
I have dealt with them, good service and willing to talk with you,



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salfonsi

11-13-2014 19:13:41




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 Re: Difference between Fairbanks Morse Magneto's in reply to salfonsi, 11-13-2014 18:11:23  
so there is no difference between type FM and type FMJ?



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steve(ill)

11-14-2014 05:16:30




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 Re: Difference between Fairbanks Morse Magneto's in reply to salfonsi, 11-13-2014 19:13:41  
FM is a manufacturer - Fairbanks Morris... J is the model.. FM-J or FMJ are the same thing.



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steve(ill)

11-14-2014 05:22:55




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 Re: Difference between Fairbanks Morse Magneto's in reply to steve(ill), 11-14-2014 05:16:30  
http://www.oldengine.org/members/diesel/FairbanksMag/MagFMType.htm

FM-J is the model .......... look at bottom of page for specific options -- ( 3 = Allis ) The 4J means it is for a 4 cylinder... could be 2 or 1 models also.



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steve(ill)

11-13-2014 19:09:10




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 Re: Difference between Fairbanks Morse Magneto's in reply to salfonsi, 11-13-2014 18:11:23  
the "3" means it is for Allis. The "B" means it is a flange mounted mag.. I have never seen an "A" on the end.



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tractorguy2

11-28-2014 16:39:08




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 Re: Difference between Fairbanks Morse Magneto's in reply to steve(ill), 11-13-2014 19:09:10  
I have seen one FM J4B3A magneto.

I'm pretty sure when I took it a part the paw plate was stamped 35% and not 30. Someone else could have changed it.

Could also be that the kill terminal is on the left side. I have seen 4B3 with kill terminal on the left and on the right. The styled WC I think used the mag with the kill on the left side.

A J4B3 and a J4B3A are close enough they will interchange.

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