Window Motor Repair / Replacement Questions

[iwhelan]

Sorry for starting a new thread, but the old one was more about the regulator, and hopefully this will help others in the future.

It seems like my non-moving power window in my '87 911 is down to the motor.

I have it separated from the gearbox (also out of the door) and the gearbox turns freely.

When the motor is out of the gearbox, it can operate from the switch in both directions. Putting the motor back in mesh with the gearbox, it seems to struggle and sometimes stops. Pulling the shaft out, the bottom of shaft has a brass bushing/bearing. This does not rotate on the shaft, so I thought that it was supposed to rotate inside the casing, but that doesn't seem to be the case. Everything else inside the motor looks ok, but it is hard to turn the shaft by hand.

Is this bearing supposed to rotate? Should the motor should be easy to turn by hand?

Assuming that I can't do anything about this, as this bearing/bushing seems pretty firmly stuck on the shaft, I'm planning to buy another motor.

As I understand it, the motor itself is pretty common and was sold for a lot of different cars but with slightly different gearboxes. Can someone provide me with a part # for one of the compatible Bosch motors that I can use with the Porsche-specific gearbox/transmission?

Thanks!

[sky1jord]

Originally Posted by iwhelan

As I understand it, the motor itself is pretty common and was sold for a lot of different cars but with slightly different gearboxes. Can someone provide me with a part # for one of the compatible Bosch motors that I can use with the Porsche-specific gearbox/transmission?

Thanks!

From my experience, the motor/gearbox only comes as a single part for the whole assembly. Check our host for "window motor"

[86 911 Targa]

pm sent.

[Discseven]

Pelican Parts - European Automotive Parts and Accessories - Porsche • BMW • Mercedes • Volkswagen • Audi • Saab • Volvo • MINI

[iwhelan]

I just decided to purchase one of the Bosch motor/gearbox combos that is meant for Mercedes. My gearbox is fine, and I'll use that with the new motor. This is a lot less expensive than the nearly identical part for Porsche.

[kyngfish]

Can you post the part number?

[iwhelan]

I will when I receive it. The source that I bought it from didn't actually list the Bosch part # for some reason, only the application and a photo.

I usually buy all of my Porsche products from our host, but in this case, I don't really want to pay for something I don't need, and I don't need the Porsche specific gearbox (that is almost identical to the Mercedes one) that makes the cost about $200 more expensive.

[iwhelan]

I'm still not sure how the brass bushing/bearing is supposed to work on the original motor. Are these motors supposed to be easy to rotate by hand? There is no top bearing so I would imagine even a good one would be tough to rotate if it is not installed with the gearbox. At the top of the gearbox there is a spherical bushing that the motor shaft fits into to keep it aligned at the top.

This spherical bushing can slightly rotate when the motor shaft is removed, so when you go to put the motor back in, it won't go all the way in. I only found this once I removed the back cover, but if you don't need or want to remove this back cover, you may be able to straighten this bushing so the opening is line with the incoming shaft by inserting a pen or small screwdriver.

Is this bottom bushing/bearing supposed to rotate on the motor shaft? If so, perhaps I can still free it up with some penetrating oil and refurb this motor for future use.

[iwhelan]

Well, I'm sorry to say that I came very close, but not close enough. The motor I purchased was Bosch part # 0 130 821 260. The castings of the gearbox were a little different, but the bolt holes were actually in the exact same configuration relative to each other. I got excited thinking that I could actually just use the gearbox that this motor came with. Unfortunately, the gear has 10 teeth and is slightly larger than the stock 8 tooth gear. This put things just out of alignment so that I couldn't bolt it up. Bummer!

Then I tried swapping the new motor onto the original gearbox, but something was slightly different and I couldn't get the new motor to mesh with the old gearbox. I had the back cover off of the old gearbox and it seems like the gear wheel is slightly larger on the old gearbox than what must be in the new one.

I bet if you had a way to see a bunch of the various versions of the Bosch window motors next to each other, one of them could potentially fit. Unfortunately, I don't have that luxury and I will have to pay about $200 more than this one to get the one meant for Porsche, even though they're nearly identical. Bummer again.

[bivenator]

I just replaced my window motor with the one offered here on Pelican. I only paid 130$, it doesn't say Porsche on the part but the window goes up and down.

[iwhelan]

Where are you finding that? I only see a part that costs $311.50.

The one I'm seeing is this: http://www.pelicanparts.com/More_Info/91162401441.htm?pn=911-624-014-41-OEM&SVSVSI=814

Ah, I see that a couple of Dansk motors come up if I change my year to 1988. These don't show up when searching for '87 for some reason. I'm not sure why these would not be compatible with '87. Unfortunately though, the passenger side motor is out of stock anyway.

[sky1jord]

The PET definitely shows that '88 and '87 cars have different part #'s for the motor. You might try calling Pelican's customer service and ask what the differences between the two are and why they aren't interchangeable

[john walker's workshop]

That brass bushing on the end of the armature shaft is stuck on the shaft. It's supposed to be captured at the bottom of the housing with a retainer. You need to get it off the shaft with pliers, clean, lube and reinstall it in the retainer clip. The clip needs to be opened a bit then closed over the bushing to keep it in place. I've fixed a lot of these.

[iwhelan]

I was able to find a source that has the motor for a similar price to the Mercedes ones. I won't mention it here in respect to Wayne though. I'll keep on ordering from this site for other things though as long as it is competitive!

John Walker: Thanks, I appreciate that info. I will certainly try doing that. It seems to be really tightly in place on that shaft. This will be good as a backup for the driver's side if it fails in the future.