nrubenstein

The crevices were full of dirt, for what it's worth.

On a garage queen, I probably wouldn't be so motivated that I'd take the rear end apart just to look at this. On the other hand, it'd be silly not to take a look if you have the mufflers out, IMHO. For that matter, if you peel back the fender liner, you can at least clean out the top and put some grease or cavity wax in there. That would likely arrest or at least dramatically slow down any rust as long as it's a mild case. That seems like a worthwhile use of a few minutes every few years.

ronnie993tt

Now thess are excellent ideas. I think a good hose spray back there every wash could largely solve the problem. I always go for a drive after to dry the car out and a hot engine should dry this area. If I can be sure it's clean a little grease would basically "melt" and protect the area.

nrubenstein

Even if not perfectly clean, a resilient penetrating oil like CorrosionX would probably do a lot of good.

x98boardwell

Beautiful job on the welding and fitment!!!!

Metal Guru

Since water and dirt are trapped between that stamping and the body, spraying more water into the assembly will only make things worse.
Either the assembly must be totally sealed or modified to allow water and dirt to pass through, or a combination of both.

Mike J

This seems to be pretty common but variable, some cars seem to be hit bad, some have no issues - here is a good DIY on what to do when the metal is still intact...

https://rennlist.com/forums/993-foru...-rust-diy.html

Cheers,

Mike

nrubenstein

Ugh, yeah. Blow it out with an air hose. Maybe wipe it down, and then apply a protective wax, grease, or penetrating oil if you don't want to/can't take it apart.

Basal Skull

Is there a way to see/access this area from the wheel well side? I assume the dirt/water is getting in from the wheel side? Would be a hassle to have to take the bumper off every time we want to blow some air up there. I'll take a look later today.

nrubenstein

You can peel back the fender lining and see the top. You can't really see a lot, unless things are REALLY bad. You can blow it out and put something in, but you can't actually see without pulling huge muffler and heat shield.

Basal Skull

good to know, maybe I'll shoot some penetrating oil or something up there, can't hurt..

nrubenstein

I really like CorrosionX for this sort of use. I'd probably shoot a little bit in the crevices every year or two.

Knight

Mike have you seen many local 993s with this issue? Really curious now if mine has any rust in there.

Mike J

Have not dug into the that area yet - I also have not checked mine yet other than a superficial inspection when I first got it, was going to remove the panels this winter (when its snowing and really crappy out...).

We can inspect yours when we dig into some maintenance - if you dare.. :-)

Cheers,

Mike