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914World.com _ 914World Garage _ Not Your Usual Rust

Posted by: 914DiceRoll Jun 9 2015, 12:26 PM

My 914 has a rusted out area on the rear fender just above the door latch. It looks like it was a result of the foam insulation inside the fender holding moisture and rusting the fender from the inside. Has anyone developed an effective repair procedure for this problem short of replacing the entire fender?

Posted by: billh1963 Jun 9 2015, 12:43 PM

I've got a '75 that has the same issue.

Unfortunately, it's not so uncommon.

Posted by: barebrad Jun 9 2015, 12:58 PM

You can purchase a patch piece from Restoration Design that fits nicely! Just be sure to remove all the seam sealer and ALL the rust, then cut the patch down to fit...

Posted by: malcolm2 Jun 9 2015, 01:01 PM

Me too, but mine was not that far along. It comes from the seam sealer injected into that tight spot. I guess if it is done correctly it seals. If it is not, it either has a place for the water to pool or it cracks and lets the water in. Your rear tire slings water and dirt up there. Then the dirt and water SIT and SIT and SIT and start the rusting.

Same thing happens on the other end. Way up in the wheel well by the brake light. Since you have this one open, you should start picking at the other door handle.

Heat gun, screw driver, ice pick, dental pick, just get it out of the other too.

Posted by: mepstein Jun 9 2015, 01:16 PM

Very common. Cut it out and replace with new metal. I bet you'll see more rust once you start removing paint since that area rusts from the inside out.

Posted by: Cairo94507 Jun 9 2015, 02:15 PM

Very common. Grind, cut, weld and move to the other side. Make sure to remove all that rust fertilizer up in those panels. I would strip the vinyl off the roller and look for more rust - might as well address that at the same time. It also resides at the rear of the quarter adjacent to the taillights. Take a light, look up in their and check it out. That crap just absorbs water like a sponge and holds it. Porsche Planning and Research totally hosed that one.

Posted by: r_towle Jun 9 2015, 02:17 PM

yup

http://www.restoration-design.com/store/product/PP304L

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Posted by: TargaToy Jun 9 2015, 04:46 PM

Get up with bdstone914 here on the world. He may be cutting a car up that has those sections in good shape. The advantage of that is the piece cut out of the donor car will have the 90 degree vent tube intact. I am not sure that the RD pieces do.

I got a L and R side piece from a member here who cut up a car in NC. So far I have the driver's side installed and I'm happy with it. Unfortunately, I still have to do the passenger side.

Posted by: mr914 Jun 9 2015, 05:27 PM

It's all repairable

Open it up and see what lurks behind....

Mine required a few custom cuts and some creative welding

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Posted by: mr914 Jun 9 2015, 05:29 PM

Fitting and grinding

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Posted by: mr914 Jun 9 2015, 05:31 PM

Time and patience

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Posted by: Tom_T Jun 9 2015, 09:40 PM

So common in fact that 914s started rusting there within a couple of years old - including mine at 3.5 years & I went round & round with Porsche+Audi to get it fixed - they were aware of it & that their "magic foam" filler was the culprit.

I repaired it 2x at my cost in 76 & 80, & will again soon in my resto!

I agree with the above & cleaning all of the foam out, & with looking at what lurks behind, cuz the multi-layered sections in the rollbar can also rust too & that is a major torsional stiffness element in our 914s!

Good Luck!
Tom
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Posted by: 914DiceRoll Jun 10 2015, 07:23 PM

Thanks for all the advice and suggestions. My next step will be to remove the rest of the moisture holding foam and figure out just how extensive the damage is.
Ron
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Posted by: 914DiceRoll Jun 10 2015, 07:24 PM

Thanks for all the advice and suggestions. My next step will be to remove the rest of the moisture holding foam and figure out just how extensive the damage is.
Ron