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JD A Mag

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dwm

04-29-2003 15:32:40




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Okay magneto time. The Fairbanks-Morse that came on this 1945 (or so) A is dead, no spark out either side. Anyone know if this F-M mag is even a correct replacement for the original Wico 'C'? The F-M looks almost new, but am wondering whether to put much time in this or just go get the right mag.




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Duane Larson

04-30-2003 12:21:23




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 Re: JD A Mag in reply to dwm, 04-29-2003 15:32:40  
dwm,
The magneto you have was OEM on the first model A's from s/n 410000-424024. They used a short-lug coupling - the DRV2B was used from 424025-466400 and used a long lug coupling.
You have a pretty desirable magneto there - harder to find than the DRV2B or Wico C! You might check with Robert's Carburetor - he also deals in magnetos and would give you a straight story.
www.robertscarbrepair.com

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dwm

05-01-2003 07:27:38




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 Re: Re: JD A Mag in reply to Duane Larson, 04-30-2003 12:21:23  
Thanks, Duane. We have not had as much time as we'd like to tear into this thing yet. We may be able to get this F-M mag going, not sure why there's no spark. We'll post our progress. dwm



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CMB

04-30-2003 06:55:35




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 Re: JD A Mag in reply to dwm, 04-29-2003 15:32:40  
I'm sort of looking for a FM RV2A mag, we might work out a trade for a WICO C or XH. Do you know if it,s a "short lug" or "long lug"? On a 1945 tractor I think it should be short lug, however the very early "A"s came with an RV2A mag & they would have been Long lug. Don't know if any later tractors used the FM RV2A, with a short lug or not.



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Rod

05-01-2003 09:34:29




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 Re: Re: JD A Mag in reply to CMB, 04-30-2003 06:55:35  
There was "never" a short or long lug FM RV mag, the length of the shaft is what dictated how far into the govenor the coupling extended. I have 2 RV's that people tried to put a long lug on then bolt them to the tractor, they broke them both. Wico and later FM used long-short lug to interchange mags with out changing shafts, on old and later JD. I would trade you a"rebuilt"wico x or wico c for your FM RV, let me know.

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Rod

05-01-2003 09:26:53




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 Re: Re: JD A Mag in reply to CMB, 04-30-2003 06:55:35  
There was "never" a short or long lug FM RV mag, the length of the shaft is what dictated how far into the govenor the coupling extended. I have 2 RV's that people tried to put a long lug on then bolt them to the tractor, they broke them both. Wico and later FM used long-short lug to interchange mags with out changing shafts, on old and later JD.



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dwm

04-30-2003 07:43:32




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 Re: Re: JD A Mag in reply to CMB, 04-30-2003 06:55:35  
CMB,
Not sure, what exactly do we look for? While we've worked on tractors for years, this is first experience with mag ignition. We may be able to work out a trade when we get back into this thing, may be a couple of days. Thanks, dwm.



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CMB

04-30-2003 10:53:35




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 Re: Re: Re: JD A Mag in reply to dwm, 04-30-2003 07:43:32  
Sorry if I'm being unclear. The lug I am refering to is the driver on the back of the mag that connects to the governer. I just measured each & a short lug, measured from the flange where the mag bolts to the governer housing,extends what seems to be just slightly less than .8inch, while the long lug is approximatly 1.1 inch. On a Wico these can be changed, but I don't know about a Fairbanks-Morse. When you get it off & decide which way you want to go, if you want to trade, email directly.

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Clooney

04-29-2003 17:45:48




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 Re: JD A Mag in reply to dwm, 04-29-2003 15:32:40  
dwm, if your A is indeed a 45 it probably came with a Wico C [1042].
~Depending on the type Fairbanks-Morse mag you have it could have been used on an earlier A.
~I can't tell you if that mag will work without more info on the mag. If the rotation direction is correct, the lug length is correct & it fires at 180� it will work.
~Tell me more about that F/M mag & if it has a tag on it?



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dwm

04-29-2003 19:00:04




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 Re: Re: JD A Mag in reply to Clooney , 04-29-2003 17:45:48  
More Info: Fairbanks-Morse mag with the tag number 13745 on it. Also on the mag, the letters (smaller print) 'D', then in larger print 'R V', followed by smaller print again '2 A'.

Right now, it's not firing at all.

What is the correct rotation direction?

Appreciate the help, dwm



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Clooney

04-30-2003 02:37:15




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 Re: Re: Re: JD A Mag in reply to dwm, 04-29-2003 19:00:04  

dwm, that Fairbanks-Morse D RV2-A was used on the earlier unstyled A's. As long as the drive coupling is the correct length & the mag spins, it will work. That mag should be the correct rotation. The most common problem with that mag is the brushes loose contact with the rotor disk. That mag is also a 1/2 speed mag so will have to be timed to L/H compression with the correct wire running to the L/H plug. If you take that mag apart the internal gears will have to be re-timed.
~If that mag is in decent shape it is worth a few dollars & can probably be easily traded for a working Wico C, or sold & a Wico C purchased....

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John T

04-29-2003 16:17:24




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 Re: JD A Mag in reply to dwm, 04-29-2003 15:32:40  
Hey DW, Im not even sure if anyone can tell (not on any model registrys Ive ever seen) exactly which mag came on any certain tractor when it was shipped, although the Wico Brand C was indeed earlier than the XH which provides some years certainty on those brands at least. I have seen those Fairbanks mags on many A and B's and think they look quite handsome all polished up, and its not necessarily the WRONG mag in my opinion. Maybe someone has info on what mags were shipped on certain tractors????? ?? I sure dont. If it fits and mounts up into the governor like the Wico brands, it about has to be at least mechanically (even if not correct police) correct for the tractor. Before you toss it, I would at least examine its points to see if they are clean and gapped proper and clean/polish them if gray oxide coated or try and get a replacement set if they are burned or pitted or carboned badly. However, many people choose to replace with a Wico C or XH mag since they are so common and parts are readily available.

Let us know how it turns out. John T

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