Replace ball bearings with Carbon tube Bushing
One of my cheap Tower Pro Brushless motors had nasty sound when
propeller shaft was rotated. Broken / worn out ball bearings most likely.
So I removed the ball bearings or at least the most of them. The forward
one still got some of the bearings housing pressed into the aluminium stator core.
I decided to try to repair the motor by adding a carbon bushing instead
of new ball bearings who would cost more than the motor was worth.
I used a piece of 5mm dia carbon tube drilled/grinded up to approx
3mm inside (must be drill / grinded by hand to get a tight fit around
After that the steel shaft was rotating freely in the bushing it was
glued in the aluminium stator core (remember to degrease before
The test runs so far has shown that the alu. core is getting a bit hot
but there is no bad sounds or any detectable wear so far.
See sketch below
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