DDK - Die Deutschen Klassiker

Hi,

I thought I would attach some pictures which show what happens when the rear screen seal starts to leak. In the first picture you can see the extent of the bubbling on the paint work which you would see form the outside of the car, in this case the bubbling on the outside masks the true extent of rust on the inside. Porsche in there pearls of wisdom (not 100% positive what years they did this) stuffed the rear section (where the pen marks are) with padding, which simply retains any water which leaks past the screen rubber. Once leaked it starts to rust from the inside out.

Bubbling on the outside


Here is the extent of the rust from the inside

Stripped interior



Once the water is in the car it takes the easiest route and thus also starts to rust out the lower section of the shelf. In this case the major rusted areas follow the route of the water and has also rusted the lower section of the parcel shelf and also just above the right hand seat pan! The main wiring loom to the motor is also here which also traps dirt and moisture and thus may have rusted from below as well.

Main rusted areas


The “real” extent only shows up once the car is blasted. During the restoration of this 1972 E the rear screen corners will be re-made as will the required section of the parcel shelf. There are no repair panels available for these areas (pictures of the repairs will follow).

After cleaning/blasting



Working on this car has reinforced the fact that most LWB rear screen corners rot from the inside out and are also always worse on the LH side, I believe this is due to the rear screen demisting wires which make water penetration easier on the LH side.

Cheers

Alan

Crickey Alan,

Not sure whether I can sleep now; thanks for that

This is by far the most documented explanation I have seen of a common problem- I presume that this was a non-sunroof car as well? If this was combined with rusty sunroof drains then the section on top of the rear screen would be as affected?





Also, Alan, what you documented, would the "typical" bubbling be manifested by the bubbling seen above the right hand upper corner above the engine lid on this picture?



Sorry of the impact bumpered malarkies- did inspect a few sheds lately.

Best regards,


Bert

Hi Bert,

The roof shown on the silver car you attached is in very poor condition, and I suspect it is closer to a having a new roof than any repairs. The main cause of that is blocked and perished drain tubes plus moisture can sit between the seal and the metal work.

If the tubes block at the bottom (ie the outlet at the top corners of the engine bay) they also starts to rust from the inside out.

Here is an example



Once blocked at the top any water which gets past the sun roof seals simply sits in the sunroof tray.

The car currently being restored is a 1972 911 E non-sunroof car and besides the rust on the rear parcel shelf it in very good condition. I hope to have some more pics soon.

Alan

Yuo could have been taking photos of my car for this!

I have the delight of this repair to do, shame there are no repair panels available. The rear quarter is still on my car and is staying that way, all work so far shows this to be just about perfect, which coupled with my skills says leave it alone. Apart from making this job harder, any other issues I am likely to uncover.

The seat back and bases on mine are sound, just a little bit of surface rust, which easily cleans back to solid shiny steel!

Hi Simon,

Barry, here on DDK is doing the welding work on the 72E and I am sure he will chime in.

Alan

I did this repair last year on mine, I had to fabricate all the panels by hand. Will post some before/during/after pics soon.

Thanks Craig,

I look forward to seeing the pics

Alan