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Magneto Question

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Radcam
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With the nice weather I've been working on my D2, and ran into a little problem I hope someone can help me with.

The spark plug leads from the magneto on the pony motor are pressed into the backside of the dash. At sometime a layer of electrical tape was put down in the area where the plug wires touched. Not a solution I'm happy with. The mag appears to me to be the 5F7492 replacement.

What I need to know is, do I need to modify the dash or do I need to adjust the dash position? I actualy tried to loosen the dash bolts and move the dash back a little but it did not move very much. I then considered loosening all the bolts that attach the fenders and seeing if I could move it that way. Then I decided I would come here first and seek guidance from the great acmoc minds.

TIA
Cam
1938 D2 3J302 dozer
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Wed, Apr 15, 2009 11:33 PM
SJ
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Normally the wires ran through a tube to hold them but I don,t just have parts book for yours to check just how they go but someone here Im sure does.
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Thu, Apr 16, 2009 5:30 PM
Radcam
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Reply to SJ:
Normally the wires ran through a tube to hold them but I don,t just have parts book for yours to check just how they go but someone here Im sure does.
Thanks for the reply SJ.
I looked through my parts book and I see the tubes you are talking about. I'm not sure that would resolve the issue I am having. The dash is actually pressing where the plug wires go into the mag. There is chaffing on one wire to the point I can see the fiberglass mesh underneath the rubber insulation of the boot as it enters the mag.

I pulled the dash yesterday after determining that it can't be pushed back very much. (Because the pony motor air inlet passes through.) I'm thinking I will have to pound out a small relief into the dash so it clears the mag. Any suggestions or insight would be welcome before I do anything permanent.

Like I said in my first post the mag is not the original Eisemann, but the Bosch replacement which is shaped a little differently according to the illistrations in the parts book. Is it possible that the "plate assembly" (distributer cap) is the wrong one for this application?
1938 D2 3J302 dozer
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Thu, Apr 16, 2009 10:10 PM
bcwayne
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Reply to Radcam:
Thanks for the reply SJ.
I looked through my parts book and I see the tubes you are talking about. I'm not sure that would resolve the issue I am having. The dash is actually pressing where the plug wires go into the mag. There is chaffing on one wire to the point I can see the fiberglass mesh underneath the rubber insulation of the boot as it enters the mag.

I pulled the dash yesterday after determining that it can't be pushed back very much. (Because the pony motor air inlet passes through.) I'm thinking I will have to pound out a small relief into the dash so it clears the mag. Any suggestions or insight would be welcome before I do anything permanent.

Like I said in my first post the mag is not the original Eisemann, but the Bosch replacement which is shaped a little differently according to the illistrations in the parts book. Is it possible that the "plate assembly" (distributer cap) is the wrong one for this application?
Hi Cam, It seems that the Bosch mag is too long to be used as a replacement in the " J " series D2's... the attached pics tell the story.
The Eiseman as originally used on the " J " measures 5 -15/16'' from the front of the mounting flange to the tip of the cap where the wire goes in.
The Bosch as fitted on the later " U " series measures 6-9/16''.
If you can't find a working Eisman mag, a better option would be to buy a Wico mag which measures 5-1/4''. Two sources for the Wico are: Mainely Magnetos in Maine, and Standard Magneto in Chicago.
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Thu, Apr 16, 2009 11:06 PM
Radcam
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Reply to bcwayne:
Hi Cam, It seems that the Bosch mag is too long to be used as a replacement in the " J " series D2's... the attached pics tell the story.
The Eiseman as originally used on the " J " measures 5 -15/16'' from the front of the mounting flange to the tip of the cap where the wire goes in.
The Bosch as fitted on the later " U " series measures 6-9/16''.
If you can't find a working Eisman mag, a better option would be to buy a Wico mag which measures 5-1/4''. Two sources for the Wico are: Mainely Magnetos in Maine, and Standard Magneto in Chicago.
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Thanks Wayne,
I thought it may be something like that. I was hoping it was just the wrong cap assembly though.😞
1938 D2 3J302 dozer
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Thu, Apr 16, 2009 11:13 PM
drujinin
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Reply to Radcam:
Thanks Wayne,
I thought it may be something like that. I was hoping it was just the wrong cap assembly though.😞
Do you have the Model and Series number for the WICO that will fit the D2-5J series?
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Fri, Apr 17, 2009 7:18 AM
bcwayne
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Reply to drujinin:
Do you have the Model and Series number for the WICO that will fit the D2-5J series?
The attached link to a web page of Mainely Magnetos shows it to be a: XH1907. They sell new and rebuilt ones.
http://www.mainelymagnetos.com/Wiconew.html
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Fri, Apr 17, 2009 7:47 AM
Old Magnet
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Reply to bcwayne:
The attached link to a web page of Mainely Magnetos shows it to be a: XH1907. They sell new and rebuilt ones.
http://www.mainelymagnetos.com/Wiconew.html
Also a Wico # XH-2836S
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Fri, Apr 17, 2009 10:10 AM
Haole Cat
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Reply to bcwayne:
Hi Cam, It seems that the Bosch mag is too long to be used as a replacement in the " J " series D2's... the attached pics tell the story.
The Eiseman as originally used on the " J " measures 5 -15/16'' from the front of the mounting flange to the tip of the cap where the wire goes in.
The Bosch as fitted on the later " U " series measures 6-9/16''.
If you can't find a working Eisman mag, a better option would be to buy a Wico mag which measures 5-1/4''. Two sources for the Wico are: Mainely Magnetos in Maine, and Standard Magneto in Chicago.
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I bought a new Eisman mag. for my 3J D2 from the outfit in Chicago, and don't regret spending the $$ for it at all. Very high quality and the pony starts much better.

It was worth it..I could have rebuilt the old one, but for about $300.00 more, it was really worth the spontaneous decision...
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Fri, Apr 17, 2009 3:54 PM
drujinin
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Reply to Haole Cat:
I bought a new Eisman mag. for my 3J D2 from the outfit in Chicago, and don't regret spending the $$ for it at all. Very high quality and the pony starts much better.

It was worth it..I could have rebuilt the old one, but for about $300.00 more, it was really worth the spontaneous decision...
OK! Thanks, I printed it out and put in my notebook!
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Fri, Apr 17, 2009 5:47 PM
Jack
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Reply to drujinin:
OK! Thanks, I printed it out and put in my notebook!
My D2 5J3691 has an inspection plate in the firewall straight back from the Bosch mag cap. Whoever changed it to the Bosch mag, before my time with the Cat, just removed the plate and threw it away. That small change left plenty of room for the wires!

The Bosch is a very good magneto; the Wico is merely OK. I've run a few of both kinds, much prefer the Bosch. If it were me, I'd throw away the cover plate and use the Bosch mag like the former owner did, or does your D2 not have this inspection hole and cover plate?
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Sat, Apr 18, 2009 8:43 AM
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