[AT] Strange Magneto event today.

[Dean VP]

 Yes we went though the sequence  twice.


    On Thursday, May 21, 2020, 09:15:41 AM MST, Jim Becker <mr.jebecker at gmail.com> wrote:  
 
 Did you check to see if it went back to working when you removed it from the tractor? From: Dean VP Sent: Thursday, May 21, 2020 11:07 AMTo: Antique Tractor Email Discussion Group Subject: Re: [AT] Strange Magneto event today. Ken, Thank You, the shaft bearing wear was also something that came up in my dreams or pre-sleep last night as well. If the shaft or bearing wear is bad enough it sure would mess up the point gap,  We went through several magneto's so the rotation issue is a not in play here. No kill switch. This is the only one that quit working on the tractor. I usually check for shaft bearing wear but that wasn't on the checklist yesterday for some reason..   I guess I better print out a check list in the future. Getting old and forgetful. I used to kind of pride myself in being able to refurbish magneto's fairly quickly if there isn't something major wrong like a bad coil or something. When I got this one working yesterday, working on the tailgate of a pickup, I was kind of patting myself on the back that I still had my stuff\. Well that BS came to an end real  quick when it was installed.  :-)   On Thursday, May 21, 2020, 06:25:19 AM MST, Ken Knierim <ken.knierim at gmail.com> wrote:   Interesting... is there any endplay or runout in the magneto shaft that may throw the points off kilter when installed? It kinda sounds like a low voltage side thing (kill switch, points, grounding) or something associated with the installation (mechanical alignment, electrical connection or incorrect rotation though the impulse probably wouldn't work). 
 I've never had the mag off a JD so I'm just shooting in the dark. Ken in AZ
 On Wed, May 20, 2020 at 11:04 PM Dean VP <deanvp at att.net> wrote:

    Was helping a friend today testing out some carburetors and Magneto's on his 1936 JD B. A very strange thing occurred. I was in charge of clean ing Magneto's up and getting them to the point that they would deliver spark manually on the bench. Then we would install them on a tractor and get the tractor running. I went though one Magenta pretty thoroughly and was getting really good spark out of both ports on the bench. Install it on the tractor absolutely no spark.   Could hear a really good impulse. We tried tightening it up tighter and also loosening it up. No change ...no spark.  Blew me away I was getting really GOOD SPARK MANUALLY NOT MORE THAN A FEW MINUTES BEFORE. W hat in the sawmill would cause something like that.  The only thing we didn't check was to see if the Magneto was getting grounded properly to the governor.  That is the only thing I can think of right now. What other reasons would cause this strange event???  Really weird._______________________________________________
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