Smitje 928

I recently bought a set of window lift mechanisms and motors out of a Euro '95 GTS.

The owner is very meticulous with his car which is in an absolute mint condition. He replaced the mechanism and motors as a precaution only, they were functioning just fine.

Today I put them on the kitchen table and compared them to the original window motors that came out of my '87 S4, and noticed they are different: my '87 S4 one on the right, the GTS one on the left:




The length of the cover at the bottom is different: the '87 S4 ones measure about 9,5 cm:




....while the GTS ones measure around 8 cm:




I cleaned up the cover on one of the GTS motors and it has a Bosch and a Brose number on it, which seams correct as the lifting mechanism also has "Brose" written on it:




The owner of the GTS is not the first owner, so unfortunately no information of a previous replacement prior to him owning the car. Checking the forum and also Theo Jenniskens excellent website
I came across awrite-up that suggest using Saab window motors as a more affordable replacement, and I found this photo on the internet that looks like the ones coming out of the GTS:



Could it be Saab window motors? Or did Porsche use different window motors during the transition from S4 to GT and GTS?
Does anyone have any thoughts or info on these window motors?

Thanks for any help!!

Manfred

ROG100

I suspect it changed in 1992 when the GTS was introduced. The motor was no longer available as a separate part and it came complete with the regulator.
I see no reason why they should not be interchangeable.

Mrmerlin

FWIW carefully pull the plastic nylon button out of the housing ,
then sand down the metal wave washer thats under it.

Then put DC111 on the washer, and some where it seats.
Push the button back into place ,

This will prevent the washer from corroding and then swelling and adding pressure to the gear track,
that will then increase the friction that the motor must overcome and thus slow down the window

Smitje 928

Hi Roger,

That might be the explanation. I just wondered if the motor might have been changed in the past, as it is different than what I expected to see.

The owner of the GTS came up with a photo of the new regulators and motors just prior to them beeing installed in his car.
They look exactly the same as the ones that came out of his car, so as far as I'm concerned case closed....



Thanks for your input, Roger!

Cheers,

Manfred

Smitje 928

Thanks for that, Stan: I don't think I would have been able to come up with that myself.

Just to be sure: are you refering to this button?



I know this is a photo of a Saab window motor, but I checked online and saw that the Porsche version also has a similar button.

I ordered some Liquimoly silicon lubricant, I that similar enough to DC111 you reckon?

Cheers,

Manfred

Smitje 928

I think this beautiful car deserves more than just my opinion and observation, so here are a few photos:





The very last 928 delivered in The Netherlands, in a stunning dark blue color.

I can only hope my S4 will turn out half as beautiful as this car......

Mrmerlin

Beautiful profile picture, good luck with it.
for your question,
Thats the button,
I used my Knipix flat jaw pliers to pull the button out,
but you could also use 2 razor blades placed opposite to pry the button straight up,
its held in with a swelled bayonet pin.
No idea about what grease you got DC111 is a non setting silicone grease