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Allis Chalmers Discussion Forum

Magneto not working?

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08-19-2003 19:43:09

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Hi I just bought a 47 WC not running the guy said he had the engine rebuilt from top to bottom and it ran super good he went to crank it earlier this year and wouldn't start the mag has no fire how do you check the points (what is the gap) and how do you troubleshoot it looking for a cheap way to fix it haven't heard it run and don't want to give $300 for a mag until I do would really appreciate any help

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Glen in TX

08-27-2003 13:24:16

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 Re: Magneto not working? in reply to newallis, 08-19-2003 19:43:09  
Hi, Hope you found the problem with your mag. If now let me know. I have the original FM parts and a good line of aftermarket ones as well probably for less than NAPA and we work on them too. Set the points on the FM-J at .020 and on the FM-X at .015. I have some RV4 points and parts too. Also be sure to get the right condenser as too many people put the wrong ones in this mag.

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Steve in N.J.

08-21-2003 07:51:01

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 Re: Magneto not working? in reply to newallis, 08-19-2003 19:43:09  
The WC had two different style Fairbanks mags. I'm not sure what years had which, but some WC's came with the RV4 mag which is long with the high tension towers facing up on a 37 degree angle. The other was the popular FM4B mag which is the common horizonal style mag with the high tension towers out the top. You may be able to get points for the 4B from Napa, but I don't think you'll find them at Napa for the RV4. We carry F/M mag parts in stock, and also service them. If you need any more info, drop us a line, or give us a call, be happy to help ya out!
Steve/B&B Custom Circuits

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Mark in MN

08-20-2003 20:02:14

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 Re: Magneto not working? in reply to newallis, 08-19-2003 19:43:09  
Or put dist/coil. assembly on it. Assembly from older farmalls bolt right as well. Mark

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08-19-2003 23:19:14

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 Re: Magneto not working? in reply to newallis, 08-19-2003 19:43:09  
NAPA has points and condensor for not too much. Point gap is .020".

Make sure it's alligned properly so the rotor is pointing to a wire when the mag fires.

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