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Posted by chriscase on Monday, September 08, 2008 at 12:50:34 :
In Reply to: starter running slow? any help posted by Ed Bevis on Sunday, September 07, 2008 at 13:49:54 :
What happens is that the side thrust of the gears wears one side of the bushing. Since the inverse square law of physics* counts on electromagnetism, the armature is as close as possible to the field. But just a bit of wear in the bushing allows the armature to 'drag' on the field. You can see the rubbing on a disassembled 'bad' starter. Just a little rubbing causes great loss of torque.
Cheapest fix- loosen the through bolts, and insert a folded up match book cover between nose cone and body, opposite flywheel. This will kauck (net nanny) the body and push the armature away from the fields.
Next easiest fix- disassemble starter enough to drive the bushing out, and re-insert 180 degrees out.
Or go all the way- buy a bushing for about $2 and put it in.
My experience is that changing bushings and drives as needed will make the same starter last looong time. Change the bushings at first sign of dragging. Brushes wear more slowly, and will last several bushings- if you don't fry the whole thing by trying too hard to crank while it's dragging severly.
* halving the distance means four times the force. Closer is better, eh?