Window motor (dying??)

[Laldog]

Got around to checking my "new" window motor from an E28 via EBay.

Initially, motor wouldn't spin when connected directly to battery on the bench. Hitting it with a magic hammer got the motor spinning.

I connected it to my coupes window regulator, and bench tested it... it jumped but did not spin.

Opened window gear box up, cleaned out old grease, spun it a bunch of times on the bench while adding white lithium grease. Motor spins fine directly connected to battery on the bench. Great.

Re-connected it to the coupes window regulator....and of course it jumped a bit but does not spin.

It seems like it has the power to "free wheel" but not drive the window regulator.

Do the motors eventually just get tired and wear out (Like me right now...)?

Is this motor dying and NOT something that should be installed?

Any tips would be appreciated.
Thanks

 

[Laldog]

Got around to checking my "new" window motor from an E28 via EBay.

Initially, motor wouldn't spin when connected directly to battery on the bench. Hitting it with a magic hammer got the motor spinning.

I connected it to my coupes window regulator, and bench tested it... it jumped but did not spin.

Opened window gear box up, cleaned out old grease, spun it a bunch of times on the bench while adding white lithium grease. Motor spins fine directly connected to battery on the bench. Great.

Re-connected it to the coupes window regulator....and of course it jumped a bit but does not spin.

It seems like it has the power to "free wheel" but not drive the window regulator.

Do the motors eventually just get tired and wear out (Like me right now...)?

Is this motor dying and NOT something that should be installed?

Any tips would be appreciated.
Thanks

NEVER MIND!!

Regulator was bottoming out.
I thought I had previously tried reversing the polarity, but maybe I didn't.
Anyway, I reversed the polarity, motor spins the regulator, all is good.

Let's see how installation goes.

Any recommendations for lubrication of the window runners?

 

[Thomas76]

Grease is good.

 

[Arde]

Any recommendations for lubrication of the window runners?

I used grease for E9 and E24 window lubrication.
Lately I learned there are better ways to lubricate and grease things but I hold back to avoid politics.