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Allis Chalmers Discussion Forum
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No spark on B

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Hand Crank

08-30-2007 12:27:09




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Can`t get any spark on my 1939 B that I just bought.New plugs & wires.It has a fairbanks-morse 4B mag.I haven`t been into the mag yet.I don`t have a manual,so I don`t know how to check the timing.Where could I get a set of points & condenser for this mag?This mag stuff is all new to me.Any help on this will be greatly appreciated, Don.




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Hand Crank

09-01-2007 13:23:15




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 Re: No spark on B in reply to Hand Crank, 08-30-2007 12:27:09  
Thank`s to all of you fellows for your response.All good advice.I cleaned the points & on the third turn of the crank she fired up an ran fine.Two more questions.The shifting lever spins in all directions.Is this correct?Also,when faceing the tractor from the rear,the rear wheel on the right has a wobble in the hub.Can this be taken care of by tighting the nut?Must be a special wrench.I don`t have anything that will fit it.Again`Thank you so much for your help, Don

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Steve in N.J.

08-31-2007 19:03:05




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 Re: No spark on B in reply to Hand Crank, 08-30-2007 12:27:09  
Don,
I can help you with parts, info, and service on the F/M Mags. Drop us a line, or give a call. Be happy to help you out...
Steve@B&B (973)632-5596



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soundguy

08-30-2007 22:50:35




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 Re: No spark on B in reply to Hand Crank, 08-30-2007 12:27:09  
TSC had points for my JD B mag.. maybe they got yours??

Soundguy



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ohio

08-30-2007 13:34:16




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 Re: No spark on B in reply to Hand Crank, 08-30-2007 12:27:09  
i've seen the bushing around the kill button stud short out. an old campaign or advertising nail file from the fair works best for cleaning the points. or a small swiss pattern file.



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CENTAUR

08-30-2007 13:03:41




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 Re: No spark on B in reply to Hand Crank, 08-30-2007 12:27:09  
OLD gave you a good offer and advice.I want to add that old points can be made to work like new ones by resurfacing them on a high speed grinder wheel.Four that come to mind are 120 grit on a regular bench grinder or (Air powered die grinder) or (VALVE GRINDER) or perhaps an ordinary (Electric Dremel).Try till you get a chrome like finish on some scrap.Just take enough off to get a good contact.This may save you a lot of time and trouble. CENTAUR

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old

08-30-2007 12:33:43




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 Re: No spark on B in reply to Hand Crank, 08-30-2007 12:27:09  
Points in the mag are probably bad and need to be replaced. Now before you jump in and take the cover off to get to them you will need a mag manual to be able to do things right. That manual is easy as sending me an e-mail and I can send you in since I have one in my computer. Well I really have 2 of them one for the J-4 type and one for the other type. By the way its not likey to be a timing problen because timing doesn't just go out and most likey its just the points which do go bad just by sitting

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