GilesM

My 964 C2 Targa exhaust heat exchanger seems to have failed around the flange in the normal way! Can anyone suggest a reputable repairer in the south-east? I've been quoted £2300 + VAT for the part alone just for the left hand side.

thanks
Giles

mystert

Mine cracked at the cat attachment flange, I just looked on yelp for a local muffler shop that has welding capability and went there during my lunch break. The guy welded up the crack on the car in 15min. Probably not the best/cleanest job but it has worked well.


You could also take the heat exchanger off the car and take it to a weld shop. My convertible top bow cracked and I found a great welder on yelp to repair it. I removed it and dropped it off. A few hours later it was done and ready to go.

GilesM

Thanks for the advice Eric - I've found a guy in Birmingham (UK) but that's a bit of a treck for me. Anyway, I'll definitely try to get it welded somewhere.
thanks
Giles

tdiquattro

So where are you based, why not add it to your profile so we can chip in if you are local?

I fitted a v-band clamp to mine as it was easier and better for future work.

GilesM

Yep, just done that. Kiaran at Harpenden Classics and Performance is hopefully going to weld it for me. He's done some excellent body work for me in the past He's talking about fabricating a flange unless I can find one that is.

backitoff

Hi
I have the same problem along with corroded tin on the exchanger so it doesn't seal.
I came across this image as I was going to get a new flange made and weld it on along with welding the tin.
Hope it helps.

-nick

That's handy! I made one of these when I fabbed a sport cat replacement. I used t-304, 0.375” thick, 90mm square outside dimension, ~70mm bolt hole centers. Used a 23/64" cobalt drill bit for the four bolt holes and a 2.75" bi-metallic hole saw for the center, plus a slow drill speed, cutting lube, and plenty of breaks to keep the piece from getting too hot.

I'm not an expert welder, but I believe that you want a stainless wire when welding up the exchangers.

backitoff

Hi Nick
Thanks for the tooling and material info!
Yes, like you I'm no expert but I'll have a go and if it doesn't work out it's then time to visit an expert.

Yes, stainless wire thanks. Never welded stainless so will be interesting.

Richard H

Pretty sure the bore size should be 70mm dia to fit over the pipe that joins to the Cat if thats what you are replacing. Best check the dia on your pipe before making anything.
I replaced mine recently, had a new flange laser cut, cut the old corroded one off and welded the new one on. That part of the exhaust is not stainless by the way, well I used standard wire and a MIG and it worked a treat.

backitoff

Hi Richard
Great info, thanks for the heads up.