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Magneto help
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Hubnut View Drop Down
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Joined: 30 Jul 2014
Location: Gainesville, FL
Points: 1817 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Hubnut Quote  Post ReplyReply Direct Link To This Post Topic: Magneto help
    Posted: 24 Sep 2016 at 7:30pm
The mag on the B I'm restoring was working fine when I removed it.  I reinstalled it today to try to start the tractor and it wouldn't fire.  I pulled the mag and bench tested it.  It was doing two things weird.  1.It would fire weakly almost every click (same plug).   2. It would not catch the spring to build resistance.  It worked fine when I got the tractor a month ago.  I pulled the cover and the fiber disk is missing a tooth.   Any ideas?
Steve
1940 B "Lucy"
1941 B w/ Woods L59 "Flavia"
1942 B w/ finish mower "Dick"
1941 C w/ 3-point "Maggie"
1947 C SFW w/ L306 "Trixie"
1972 314H
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Tcmtech View Drop Down
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Joined: 15 Apr 2015
Location: Minot ND
Points: 310 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tcmtech Quote  Post ReplyReply Direct Link To This Post Posted: 24 Sep 2016 at 10:10pm
Unfortunately it sounds like rebuild time!  Shocked  

Fortunately there are still places that sell the majority of the parts that go into those magnetos so rebuilding it is just a matter of doing some internet searching to pin down what parts you need and where to get them. Wink
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Matt (Jordan,MN) View Drop Down
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Joined: 12 Sep 2009
Location: Jordan, MN
Points: 3801 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Matt (Jordan,MN) Quote  Post ReplyReply Direct Link To This Post Posted: 24 Sep 2016 at 11:46pm
Since the fiber gear is missing a tooth I'm sure the rotor is out of time hence the weak spark. As for the impulse not catching there could be a few things wrong. 1 is that the pawls are getting sticky and not tipping out as they should. 2 the pawls, pawl plate or stop pin is worn so  the pawls skip past the stop pin. 3 the impulse spring broke which you would notice as the  drive cup will be loose. Hope this helps you out.  Matt
Owner of Matt Scott LLC
Specializing in NOS and used Allis Chalmers tractor & implement parts & liturature and Magneto Repair
http://www.mattscottllc.com/
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Hubnut View Drop Down
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Joined: 30 Jul 2014
Location: Gainesville, FL
Points: 1817 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Hubnut Quote  Post ReplyReply Direct Link To This Post Posted: 25 Sep 2016 at 6:15am
Thanks Matt.  I sent you a PM about getting this one rebuilt.  I hope you have some time.
Steve
1940 B "Lucy"
1941 B w/ Woods L59 "Flavia"
1942 B w/ finish mower "Dick"
1941 C w/ 3-point "Maggie"
1947 C SFW w/ L306 "Trixie"
1972 314H
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nella(Pa) View Drop Down
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Joined: 11 Sep 2009
Location: Allentown, Pa.
Points: 3124 		Post Options Post Options   Thanks (0) Thanks(0)   Quote nella(Pa) Quote  Post ReplyReply Direct Link To This Post Posted: 25 Sep 2016 at 6:24am
Originally posted by Hubnut Hubnut wrote:

I pulled the cover and the fiber disk is missing a tooth.   Any ideas?
Steve
I have a tooth missing on a fiber gear in my B and it works fine. The fiber gear only drives the rotor.
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