Posted by pete 23 on September 28, 2017 at 20:01:16 from (173.86.91.69):
In Reply to: Rebuilding a starter posted by da.bees on September 28, 2017 at 18:15:29:
Look closely at each individual bar on the commutator. If one or two have been arcing that is a sign of a open or partially open circuit which would be the solder between winding and bar. If it has that your armature is pretty much shot. Nearly impossible to test for a open without specialy test equipment unless completely open which is highly unlikely. If just even blackening all the way around it is due to poor brush contact. That can be cleaned up with a medium grit sand paper. We used to have a special roll of armature sand paper but in later years the suppliers quit offering that and we just used regular dry , maybe 150 grit paper to start and finer to finish. Does it imbed, well, some but it has worked for years doing it that way. If deeply grooved, it should be turned on armature lathe. One other thing is that after about 50 years, about in the 60's, Delco Remy FINALLY came to their senses and quit undercutting the mica on armatures.
Other manufacturers (Autolite for one) had been NOT cutting the mica forever. If armature was undercut and you don't remove enough material to completely eliminate the groove, you will have to clean the grooves so no contact is made between each bar. A starter commutator is not nearly as fussy for getting it perfect like a generator because of the relatively low speed it turns and brushes can maintain good contact. I no longer have access to a armature lathe so I have improvised other methods for the few starters I have repaired recently. I do have a growler though.
Bushings are very important in a starter along with brush contact. Go for it.
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