saving threads of hard oil lines
 

after the separation of the oil lines and the thermostat housing didn't work out as I hoped, I now have a thermostat housing with nearly gone threads:
http://www.sherylcrow.at/car/porsche/130524/img_346.jpg

and hard oil lines with the front oil cooler (trombone style) still attached, unfortunately the threads of the nuts are blocked with pieces of the thermostat housing.
http://www.sherylcrow.at/car/porsche...4/img_4049.jpg

This pieces stick to the threads like they are welded (corroded?) and don't get off easily - any ideas how I can remove them without damaging the threads?
Is it possible to re-cut the threads on the thermostat housing?

You T stat housing is toast. BTDT. Even if you bought the thread saver extension sold here it will still leak. Ask me how i know. These are wear items and corrosion does a evil deed on them.
You can find used ones occasionally in the FS forum, I searched around online and bought a new one for around $250.

On the hose lines to front cooler, if you try to clean the thread up they will just leak, even with Teflon tape. You could try your luck with a brass wire wheel on a dremel.

Good luck!

sometimes a pick and some patience will work. esp if you soak it in Kroil first. worth a shot since new ones are so pricey.

Get a new thermostat. It is a wear item and not worth a salvage.

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No smoking during this proceedure!!!

Goggles and protective gloves, MANDATORY!

I don't want to hear about some Pelican that had to make a trip to the ER to be treated for aluminum shards and muriatic acid splashed into the EYES!!!

After the steel fittings have been degreased and plugged ... diluted Muriatic Acid will loosen or totally eat away the aluminum shards. I suggest diluting the acid until it only has bubbles of hydrogen apppear, not the really aggressive frothing ... you can test the acidity level on a scrap of aluminum foil.

Apply the muriatic acid [HCl] to the threads with a dropper or brush, being careful not to get it on the outside of the fitting -- it will remove any plating. When bubbling has stopped, allow liquid to run out quickly or sponge up with paper towel. Try the dental pick again to see if the shard has loosened. If not, apply more acid and wait five minutes. If shards are loose, rinse fitting with water, and proceed to remove remainder of shards.

Good luck!
__________________
Warren Hall, Jr.

Not remembering my chem classes anymore , will the acid react with the brass should some get past the sealing applied?

A bit of anti-sieze works wonders
 

If you get the threads repaired/replaced, be sure to use anti-seize compound on the threads. Galvanic corrosion(dissimilar metals) is not fun to deal with over time.