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Allis Chalmers Discussion Forum

A.C .magnetos (fairbanks-morse)

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charles miller

07-26-2006 09:42:11

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I had to clean my mag on my Wd and I didn't mark it right can anyone telk me how to set the timing of the mag to the rotor.

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Glen in TX

07-26-2006 12:40:43

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Re: A.C .magnetos (fairbanks-morse) in reply to charles miller, 07-26-2006 09:42:11

Yes, would put it on the rotor gear on C mark aligned with punch mark on magnet shaft gear or beveled teeth but if mark is gone this link has instructions to help.

AC / FM magneto help

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charles miller

07-27-2006 04:41:49

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Re: A.C .magnetos (fairbanks-morse) in reply to Glen in TX, 07-26-2006 12:40:43

Glen, the info you send helped some I"m have a punch mark on the small gear but no marking on the big one. Also my larger gear is not mounted in the cap it"s in the mag mounted to the points plate.

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charles miller

07-27-2006 13:07:12

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Re: A.C .magnetos (fairbanks-morse) in reply to charles miller, 07-27-2006 04:41:49

Just a note to thank all of you with my mag . I'm a parrot rescuer so if you ever have a problem with one drop me a line.

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Rod (NH)

07-27-2006 06:15:38

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Re: A.C .magnetos (fairbanks-morse) in reply to charles miller, 07-27-2006 04:41:49

Hi Charles,

Then you definitely have an FMX and not an FMJ. Unlike the FMJ, the large gear stays in the housing when the main (large) cap is removed from the FMX. I take it you removed the large gear without matchmarking the two? The photo below shows an FMX I have:

third party image

Note the relative positions of the flats on the two shafts and the marked tooth on the small gear. Try setting yours up like that and see if it works. Once you get it working, I'd matchmark the large gear for the next time. However, just changing points and condenser should not require unmeshing the gears. The large gear is retained in the housing by a snap ring at the bottom of the shaft - perhaps your is missing.

Rod

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charles miller

07-27-2006 06:53:37

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Re: A.C .magnetos (fairbanks-morse) in reply to Rod (NH), 07-27-2006 06:15:38

Rob thank you this is my mag I think I can get it now.

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Bob

07-26-2006 09:59:43

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Re: A.C .magnetos (fairbanks-morse) in reply to charles miller, 07-26-2006 09:42:11

The little gear on the rotor and the large gear both have timing marks from the factory.

Probably, the rotor gear will have one mark labled "A", and one mark labeled "C", for "clockwise" and "anti-clockwise". Since your mag runs clockwise, use the "C" mark.

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charlie miller

07-26-2006 14:25:21

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Re: A.C .magnetos (fairbanks-morse) in reply to Bob, 07-26-2006 09:59:43

bob took the mag off ,cleaned the gears and fine no marking on the gears here is more info off the tag on the mag fairbanks-morse make-cw type20 ; FM stamped 4 16c someone scratched a x in front of the 4 and a s between 1 .
serial 6331920
mfd.for 91m247 again ay scratched a y in front of the 9.

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