69 Convertible. Back story. The roller on the passenger side front track broke a couple of weeks ago. The grease in the tracks looked dirty and hard so I decided to pull all the PW parts out and clean or replace them hoping to be good for the rest of my life. The only parts reused were the glass and vertical and horizontal tracks. Used the suction cup method to adjust the glass. Everything good so far. When the motor runs the glass up to the stops it kind of relaxes. Open and close the door 2 or 3 times and the glass drops down from the stops an 1/8 inch or so. Run the stops to new glass position, run the motor down and back up and the same thing happens when you open and close the door a couple of times. I found a position where I could observe the motor gear while I ran the glass up to the stops. When the motor does it's relaxing thing it looks like the gear is turning back a little. I found that by bumping the motor against the stops several and stalling it the motor would kind of take a set and not relax. Then you could open and close the door several times and the glass would stay up against the stops. Of course if you run the glass down and back up it starts the relaxing thing again. Does this indicate the new motor is bad ? I hope this explanation understandable.

 

iwonder if the relaxing you see if "slop" in the scissor mechanisim that lifts the window.
its also possible you have a screw loose that holds this mechanism or the motor isself?
actuall if the screw hole that hold the motor are oval the motor / gear will move when bound at the top, looking alot like relaxing...

 

Cams69,
Thanks for the reply. The regulator is new US Made one and the rivet holding the arms was tight when I installed it. Motor is new also .Reaching inside the door I can't see any slop or looseness in the arms when I shake them. I've Checked all the regulator attaching bolts including bolts attaching the motor to the regulator (not easy getting a wrench on them). That's why I'm thinking the motor, as I can see the gear turn back a bit after the glass hits the stops.

 

Hmm iirc there’s a certain spot the gear lever needs to be placed on the gear motor. And the spring wind. Something sounds familiar about this. I can’t put my finger on it tho

 

yes , the gear that engages the regulator sits in the middle of a big shock absorbing spring on the electric motor body , it has a kind of a bent tab that folds down into that spring , its possible to get the cog on but with the tab outside the middle of the spring .

 

Thanks for the replies guys. I can see what you are describing on the old motor. From what little I can see on the new one mounted in the door it looks like the gear is seated correctly in the spring.

 

Update. Decided to pull the regulator and motor to look everything over. Didn't see anything obvious. Cleaned up and re-greased the old ACDelco motor, mounted it to the new regulator and reinstalled . Used the suction cup method to readjust the glass. Tested the motor up and down until the battery ran down. No more problem.