Posted by Dean on June 08, 2017 at 13:32:54 from (68.50.160.151):
In Reply to: Re: 12 vs 6 posted by Geo-TH,In on June 08, 2017 at 11:53:53:
Agreed, George.
Operating a 6V starter from a 12V source puts forces upon the starter/drive/ring gear that are well above design specs.
Depending upon the design of the starter and starter drive such forces will eventually lead to failure of the weak link(s).
On some tractors, e.g., Fergusons, Farmalls, the starter nose cone is one of the weak links. I've seen several broken nose cones on Fergusons and Farmalls. All had been converted to 12V while leaving the 6V starter in place.
A close friend of mine who rebuilt starters, generators, alternators, etc. for nearly 60 years said that his tractor starter business ramped up considerably during the antique tractor craze a few years ago once folks started converting to 12V and nose cones, starter drives, ring gears, etc. started failing.
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