[AJD] Magneto question

[Louis]

The Wico mag fires two times during a cycle.  Once near TDC of the
compression stroke and once near TDC on the exhaust stroke.

The Fairbanks is geared so that the mag only fires near TDC of the
compression stroke.  Other than that the operation principal is the same.

You might want to call Ken Weaver.  He is a very good magneto man.  He is
very fair with his prices.  His number is 419-896-2827.  He can tell you all
about the mags.  I would guess that he would have the proper one for your
tractor on his shelf.

Louis Spiegelberg

-----Original Message-----
From: antique-johndeere-bounces at lists.antique-tractor.com
[mailto:antique-johndeere-bounces at lists.antique-tractor.com] On Behalf Of
Michael Scholl
Sent: Tuesday, March 04, 2008 11:58 AM
To: 'Antique John Deere mailing list'
Subject: [AJD] Magneto question



I'm in the process of restoring my 1935 B Ser # 5### (am also beginning
cleanup of the '39 B).  After restoration, I plan to drive it (and
eventually both) in the local parades and threshing shows. 

I want to make the tractor look as close to original as my budget will
allow, though I have no intention of putting it back on steel (it has
cut-offs now).  

The '35 tractor, which has been in the family since ~1945 is equipped with a
Wico XH short-lug that has had the lugs lengthened (the '39 also has a Wico
XH), timing has never been an issue as the tractor starts and runs well.

The books say that my tractor was originally equipped with a Fairbanks-Morse
DRV2B, but I know almost nothing about the FM.  My PC676 parts catalog
doesn't show a breakdown of the FM, only the 3 applicable variants of Wico.

>From the pictures of the FM, it's hard to visualize how the spark
distribution mechanism works.  My question is, 
"Does the FM operate in the conventional way (spring impulse, coil, points,
condenser)?"

     

 

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