My driver’s side power window was painfully slow, especially on the way up. I purchased a new power window motor from 928 International, and had some time after being away from the car for 7 months.
I believe most (if not all) of the power window mechanism in the 928 production run from 1978-1995 are more or less the same. The window motors changed the number of teeth that they employed: the older motors (1978-83) used eight teeth, the newer ten. Mine was a 10-tooth-motor.
First, I removed the door panel. There is a procedure to follow, with photos, on landsharkoz’s 928 page, here:
A couple of mistakes I’ve made in the past:
– It is easy to lose parts (especially the small screw that holds the backing for the door release lever) so keep them in a safe place.
– Near the door lock, there is a one-inch protruding piece of thin metal that slides in near the door lock. One must slide the interior panel forwards towards the front of the car, otherwise trim will be ripped. I found this out the hard way the first time I tried to take apart a door panel.
– Special care needs to be taken to ensure that the speaker wires and mirror wires are not ripped off at their respective crimps.
Left Window Motor, 928 624 014 03. I purchased a used motor from 928 International.
White Lithium Grease
Torque Wrench (to torque bolts to 84 inch-pounds.)
To remove the window transmission, I did this:
1) Window up.
2) Put a screwdriver under the window to catch it so that it won’t fall down. I originally used a C-clamp, but it got in the way when I tried to remove the window regulator.