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Case Tractors Discussion Forum
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Magneto problems

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Mikey S.

12-12-2005 20:24:41




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I"m looking for information on how to rebuild a magneto on a Case SC tractor. The year range is from 1940-1950 and it"s 4 cylinder gas.

That"s all the info I have (right now) on the tractor, I don"t know if more is needed or not.

If anyone can help it would be greatly appreciated.




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Mikey S.

12-15-2005 07:30:47




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 Re: Magneto problems in reply to Mikey S., 12-12-2005 20:24:41  
So my uncle says he is looking for a Case SC 41 magneto. He needs a rotary button, gaskets, condensor, and points.

Does anyone know where he can get these at?

He also mentioned something about wanting a converter (electric/electronic). Does anyone know anything about that?



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Glen in TX

12-15-2005 10:42:55




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 Re: Magneto problems in reply to Mikey S., 12-15-2005 07:30:47  
I sent you a email about mag parts. No electronic conversion for the Case mag unless you want to go with a later Bosch high $$$ electronic mag that used for industrial engines. You could go with a Delco or IHC battery distributor with the Pertronix electronic ignition conversion installed. If you don't already have a generator or electric start that may not be a option.



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M5G

12-13-2005 17:30:16




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 Re: Magneto problems in reply to Mikey S., 12-12-2005 20:24:41  
The old manual lists a Case 41 mag for the S and VA series. I have a VAC with a Wico Model XH1344 mag on it and its worked fine for many years. Reading in the manual, it states Series D after 4607032, C, S and VA are equipped with magnetos which have a 25 degree lag angle impulse coupling. FYI..



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Glen in TX

12-13-2005 22:31:29




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 Re: Magneto problems in reply to M5G, 12-13-2005 17:30:16  
Early ones were base mount mags using 30 or 35 degree impulses. Later ones used the flange mount mags for Case S & D series set to 25 degrees. The flange mount mags for all V series using a mag were to be set at 15 degrees for the continental engines. Later V series used a distributor. The impulses are adjustable on the Case and Wico flange mount mags so they can fit either. All parts are available for the Wico XH again and new complete mags.

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hector gemme

12-13-2005 02:16:38




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 Re: Magneto problems in reply to Mikey S., 12-12-2005 20:24:41  
HI I have a good h4 magneto for sale.HECTOR



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Glen in TX

12-12-2005 21:31:10




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 Re: Magneto problems in reply to Mikey S., 12-12-2005 20:24:41  
Mikey, I rebuild mags and also have info or parts if you want to tune up or rebuild it yourself also. First would have to know which mag you have on the SC. The Case flange mount mag model 4JMA has the Eagle on the top coil cover. The later Case 41 mag has a smaller Eagle on the side of main aluminum housing. Many Case magneto parts are hard to find now and haven't been made new in 30-40 years now so just depends on the condition if it's rebuildable or what you want to spend on it. Some other mags used on SC were Splitdorf, Fairbanks Morse, or later replacements in Wico or Bosch brands also. Most all parts are available yet for the later Wico, Bosch or Fairbanks Morse mags. Some will also convert them to a battery distributor like a Delco or IHC or even use a IHC H4 mag on them. Parts are available for those also.

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Fred in Utah

12-13-2005 08:18:52




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 Re: Magneto problems in reply to Glen in TX, 12-12-2005 21:31:10  
Glen, I have a 1948 Case LA that has sat for 20+ years. I would like to restore the tractor. It has the mag with the Eagle on top. How do I go about restoring and testing? I can turn the mag by hand but it is hard. It had a lot of dirt blow into it over the years. How do I clean it? Are there instruction some where I can follow? Thanks, Fred



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Glen in TX

12-13-2005 09:13:38




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 Re: Magneto problems in reply to Fred in Utah, 12-13-2005 08:18:52  
Your LA has the older Case base mount mag called a model 4CMA. Not my favorite to work on. You'll need to get it apart and blow out the fine dust and regrease bearings and it's good to recharge magnet if you can. Rewound coils, new gaskets, rebuilt condensers and very few NOS parts are what is available for the 4CMA model. If you get a good blue spark after cleaning points it might be okay but you need to get the dust out of it or it will cause arcing inside. Copies of the old Case Service manuals come up for sale frequently on ebay and other places too. If you need copy of parts manual for 4CMA email me.

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Mathias NY

12-13-2005 04:19:28




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 Re: Magneto problems in reply to Glen in TX, 12-12-2005 21:31:10  
Has anyone attemted to use non-Case parts in a Case magneto?

Given the wide variety of aftermarket coils, points, and condensors, I would be shocked if some combination of these couldn't be made to work.



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M5G

12-13-2005 17:35:14




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 Re: Magneto problems in reply to Mathias NY, 12-13-2005 04:19:28  
I have a Wico magneto on my VAC...been there for 45 ot 50 yrs and still clicking.



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Glen in TX

12-13-2005 09:23:28




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 Re: Magneto problems in reply to Mathias NY, 12-13-2005 04:19:28  
New gaskets, some substitute new condensers or rebuild with electronic capacitor, rewound coils, scarce NOS parts, new bearings, new oil seals are available. Some Slick coils will fit certain models if you can find them used or NOS. New Slick aircraft coil prices are outrageous. I've tried all kinds of other combinations but it usually takes more parts mags and too much time. Impulses get real worn out and those on the Slick aircraft mags are still simular but still not quite the same and no one is going to pay the aircraft price for those when a new Wico mag and other options are available. Slick bought out the Case mag division years back and scrapped all the tooling and dies and molds and parts were discontinued by them in the late 70s. So the cost to reproduce new caps, rotors, and points and other parts would be more than most people would pay.

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