Fairbanks Morse magneto FMX1B7E
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=139848
Printed Date: 19 Jul 2025 at 11:45pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Fairbanks Morse magneto FMX1B7E
Posted By: HVFDFIREFIGHTER
Subject: Fairbanks Morse magneto FMX1B7E
Date Posted: 27 Jun 2017 at 12:56pm
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I have a Wisconsin AEN engine that appeared to be stuck. Did a little more work on the engine this morning. Took the mag off. Now the engine turns freely but I can't turn the mag. Took the mag apart and it is full of a tar like substance. It is all over everything. I am soaking it in gas to try to get it dissolved. Not sure why it is in there in the first place. Does anyone know where I can get a Fairbanks Morse FMX1B7E rebuilt? I am sure I will not remember how to put it back together. I hate to buy replacement. Only paid $25 for the engine and it was running about 5 years ago. I can see how over time the gooey substance has worked its way down to the bottom of the mag and literally "gummed up the works". Any help would be appereciated. |
Replies:
Posted By: HVFDFIREFIGHTER
Date Posted: 27 Jun 2017 at 12:58pm
| I have pictures in my phone but the website says they are to big. I will post them later today. |
Posted By: HVFDFIREFIGHTER
Date Posted: 27 Jun 2017 at 1:07pm
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Posted By: Leon n/c AR.
Date Posted: 27 Jun 2017 at 1:07pm
| I would guess that mag has the old style coil with tar in the windings. Check with Steve at B&B see if he can get parts to rebuild that model. |
Posted By: HVFDFIREFIGHTER
Date Posted: 27 Jun 2017 at 1:12pm
    Picture on left is after I cleaned the mag. Removed all the tar. soldier a wire back on the coil on the top. Wrapped it in electrical tape. I am having trouble getting the wires back into the right spots. Two black wires to screw at the bottom. Red wire from the coil to screw beside the condenser. Not sure about the two felt pieces. Does anyone know how much of a point gap? I will be surprised if this thing works. I do not have that much faith in my skills. |
Posted By: HVFDFIREFIGHTER
Date Posted: 27 Jun 2017 at 1:14pm
| deleted photo |
Posted By: VTdirtguy
Date Posted: 27 Jun 2017 at 2:05pm
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Here, I think I fixed them for you! 
   ------------- Grampa's old C got a whole new lease on life. |
Posted By: HVFDFIREFIGHTER
Date Posted: 27 Jun 2017 at 6:19pm
| OK. I got it all cleaned up. Does anyone know how the wires go on? Does this picture look right? Black wire to bottom black wire from condenser to bottom, red wire from coil to screw beside condenser. What should the gap be set at? What is the two pieces of felt for? |
Posted By: HVFDFIREFIGHTER
Date Posted: 27 Jun 2017 at 6:20pm
| deleted photo |
Posted By: HVFDFIREFIGHTER
Date Posted: 27 Jun 2017 at 6:23pm
| I removed all the tar. Wrapped the coil in tape. I really don't see how on earth this will work. I had it completely apart. I just don't have faith in my skills. |
Posted By: Matt (Jordan,MN)
Date Posted: 27 Jun 2017 at 6:29pm
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All 3 wires go under the screw for the points. The felt on the right is a oil wick. the one on the points acts as a shield so the point contact doesn't get full of oil. I have never seen a coil leak that bad before. I sure the coil will need to be replaced. I can rebuild it. Matt ------------- Owner of Matt Scott LLC Specializing in NOS and used Allis Chalmers tractor & implement parts & liturature and Magneto Repair http://www.mattscottllc.com/ |
Posted By: Bill Long
Date Posted: 27 Jun 2017 at 8:42pm
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Steve NJ is our resident expert and a sponsor of this site. You may want to contact him for a rebuild or any other information. Good Luck! Bill Long PS There may be other sponsors closer to you - Sandy Lake for one
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Posted By: Hubert (Ga)engine7
Date Posted: 27 Jun 2017 at 9:07pm
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I highly recommend Steve in NJ (B&B Custom Circuits). It will be like new when you get it back. ------------- Just an old country boy saved by the grace of God. |
Posted By: Gerald J.
Date Posted: 27 Jun 2017 at 9:34pm
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Page 11 of my AEN manual says point gap is 0.015" On that same page it suggests a magneto test. Take the plug wire off the plug and hold the bare connector 1/8" from the engine head bare metal. Turn the crankshaft by hand until the impulse mechanism trips. Should be a good spark at the plug wire. If not it suggests setting the point gap and if that doesn't work change the condenser. I'd think cleaning the points with a point file might also be useful, of course the point gap will have to be readjusted after filing. This AEN manual includes a 4 page Fairbanks-Morse magneto manual with more details. Filing the points is mentioned there. Among the details are that the cover has a gasket that is held in place with varnish and that when reassembling after working on it and it is proven to work that a new gasket and fresh varnish should be installed. Gerald J. |
Posted By: Gerald J.
Date Posted: 28 Jun 2017 at 9:52pm
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I have scanned that manual section and posted it at: http://www.geraldj.networkiowa.com/Trees/FM-Xmagneto.pdf" rel="nofollow - http://www.geraldj.networkiowa.com/Trees/FM-Xmagneto.pdf It came out huge but is sharp. Gerald J. |
Posted By: drobCA
Date Posted: 29 Jun 2017 at 9:49am
| thanks again for yet another great reference piece from the Gerald J. Library. |
Posted By: HVFDFIREFIGHTER
Date Posted: 14 Jul 2017 at 5:42pm
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Thanks to Bill at Sandy Lake Implements. I got a new coil and got it running. Here is the video. https://m.youtube.com/watch?v=1Uw2rOqlGNU&feature=youtu.be" rel="nofollow - https://m.youtube.com/watch?v=1Uw2rOqlGNU&feature=youtu.be |