z driver 88t

1984 928S

I have a small rust bubble starting near the lower rear quarter window that I want to have taken care of by a body shop. I have read several posts and seen some pictures on the forum that show a slim metal channel near the base of the window that also tends to get rusty.

Wanting to address any possible rust while the quarter windows are out, does anyone know if that channel is accessible with the interior in place or should I remove the interior side panels that surround the rear quarter window to allow the body shop to access that channel.

Thanks.

fltechpilot

Just out of curiosity, which side of the car is it on? I have a small rust bubble starting in the same position on the passenger side of the car. No sign of anything starting on the driver's side.

z driver 88t

Mine is on the driver's side. Common problem on our cars. BTW - disregard question. I found the Rennlist thread that I was looking for. Looks like repair can be done with interior in place.


https://rennlist.com/forums/928-foru...-repair-q.html

The Fixer

Hello,

I also had one bubble in this area and once I got into it I found my car years prior had a lousy 'professional' repair to this corrosion.

Body filler was used to cover the corrosion and then it was nicely blended to the quarter. The quarter windows were not taken out for the repair. Good you are taking your's out.

If you are seeing it on one side you may have it in the channel in other areas or side.
When i took out my quarter windows (MY'83) there were multiple corrosion spots the size of a quarter beginning in the channel.

I sandblasted the rust away to clean metal and spot acid etch primed with a brush, then painted. You must get rid of every trace of rust or it will come back. I am sure you know this.
Sand blasting is the best way but very messy, i have also used naval jelly in the past but it's not as effective and takes a long time in very pitted areas which you will likely have in the channel.

westija

I also have two little rust spots, one on each side of the car at the lower part of the rear quarter windows.
I'm glad I read this. thanks

77tony

While you have the rear qtr windows out, drill a small hole at the low point of the rear qtr glass where the water from rain, car wash's, etc pool. Then sand, prime & seal. This will prevent this from happening again in the future.02 T

The Fixer

good idea.

Rob Edwards

As a data point, here's the rust bubble on the passenger side of my '90GT

https://rennlist.com/forums/928-foru...er-repair.html

And some pics of the repair- note how much more corrosion jumped out when they got into it....

https://rennlist.com/forums/928-foru...-repair-q.html

z driver 88t

Rob, yours was the post I linked to above. Its the one that made me decide to pull the glass to do the repair. Thanks for documenting it.

brealytrent

I'm not 100% done, but I had the rust cut out on mine and a plate welded onto the backside (in the wheel well) and then filled with weld and ground flush. A little extreme, but if you wanted to do it yourself, that's how you'd need to do it since the sheetmetal is so thin. And of course, don't forget to body seal, prime, and undercoat the plate.