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1941 Allis B timing problems
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Revilo View Drop Down
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Joined: 06 Apr 2017
Location: Lancashire
Points: 3 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Revilo Quote  Post ReplyReply Direct Link To This Post Topic: 1941 Allis B timing problems
    Posted: 06 Apr 2017 at 12:43pm
Hello from England!

I've recently bought a 1941 Allis B.
The guy I bought it from told me he'd never had it running. He also said it had a replacement mag fitted. When I got it home I found the mag to be in poor shape so I fitted a new coil and condensor.

I'm happy there's a spark but I'm confused as to how to time it.
The mag itself - Fairbanks Morse K4B.
There's a fibre gear that's confusing. It has an A (which I understand is anticlockwise) and a C which I've timed it to (which is clockwise).
On the pictures I've seen of these gears the A and C are fairly close together. Mine aren't, they're about 9am and 2pm, which worries me as to the mags suitability for this engine.

I'd appreciate some advice.


Regards,
Andy
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
Location: illinois
Points: 88623 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 06 Apr 2017 at 10:25pm
most of the mags I have seen have the A and C maybe 20-30 degrees apart on the gear.. I don't know much about YOUR specific mag.. that might be the difference. If you have the gears lined up as expected, you will get a spark........ if the timing internal is off, it will not spark....... since yours sparks I would assume it is OK and install on the tractor and rotate the motor by hand and see that you "spark" at the TDC mark on the crank ( top dead center)... the mag should go to advance ( fire mark) as RPM increases.
 -
im thinking the FMK was an older design used on the WC tractors ?? 1930s ?


Edited by steve(ill) - 06 Apr 2017 at 10:31pm
Like them all, but love the "B"s.
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
Location: illinois
Points: 88623 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 06 Apr 2017 at 10:28pm
http://www.oldengine.org/members/diesel/FairbanksMag/PetrolMag.htm
Like them all, but love the "B"s.
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Joined: 06 Apr 2017
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Points: 3 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Revilo Quote  Post ReplyReply Direct Link To This Post Posted: 07 Apr 2017 at 2:15am
OK, thanks. It'll be Monday before I get chance to have a go at sorting it. Cheers.
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