Salvaging evap guide

Sdumper was asking couple days ago for a guide how to salvage evap. So here it is :) I decided to braze this evap once again, because I have leaks and as you probably now, bronze brazing rods hates any corrections. There is a small guide how to salvage evap.

Here is the evap:

http://img21.imageshack.us/img21/639/p1100559n.jpg

At the beginning I make two cuts with my dremel cutting blade. First is along the pipe, second between the steps (that's stepper design):

http://img710.imageshack.us/img710/7444/p1100560.jpg

http://img6.imageshack.us/img6/4913/p1100562.jpg

Then, use flat screwdriver to bend pipe as much as possible:

http://img682.imageshack.us/img682/1924/p1100563.jpg

After that, we can start heating. I used two torches (small propane-oxy and bigger one propane only). Now we have to unwrap pipe. It can be done with screwdriver or pliers, all methods are good ;) At the end we must remove the pipe, capilary usually break just above the evap, so we have to drill hole with the same diameter. Photos with lamp and without.

http://img708.imageshack.us/img708/149/p1100565.jpg

http://img708.imageshack.us/img708/1019/p1100567.jpg

Still hot evap after removing all useless things :)

http://img708.imageshack.us/img708/1497/p1100569.jpg

http://img402.imageshack.us/img402/6471/p1100568.jpg

And at the end. Now only cleaning left - I prefer citric acid. And finally some filing to remove all remains of bronze.

http://img402.imageshack.us/img402/618/p1100571n.jpg

Pic after cleaning with citric acid:

http://img687.imageshack.us/img687/7118/p1100576.jpg

Thanks!!!!!

Awesome write up!!!

Ron/Chris/Kayl, can you guys sticky this thread so we can find it when we need it?

Guide inserted into -> http://www.xtremesystems.org/forums/....php?p=1535018 under the Evap Discussions.

Which reminds me somebody needs to rework all those guides. Maybe after I condense that autocascade thread..

Quote:

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Originally Posted by [XC] gomeler

Guide inserted into -> http://www.xtremesystems.org/forums/....php?p=1535018 under the Evap Discussions.

Which reminds me somebody needs to rework all those guides. Maybe after I condense that autocascade thread..

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Hey at what temp does that auto-C thread condense?

Quote:

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Hey at what temp does that auto-C thread condense?

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A little warmer then when hell freezes over ;)

Thanks Gom.

If all you are doing is trying to seal up the leaks after using 15% rods, use 45%-56% silver braze. Apply flux over the areas that are leaking, heat up the area and rebraze with high silver content brazing alloy.

Quote:

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Originally Posted by ultralo1

If all you are doing is trying to seal up the leaks after using 15% rods, use 45%-56% silver braze. Apply flux over the areas that are leaking, heat up the area and rebraze with high silver content brazing alloy.

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Sometimes it becomes necessarily to actually access the interior of an evap. For instance if you want to drill a second feed for a hot gas bypass or if you want to replace a broken flexline in a system where the captube was run through the suction line.

In most cases it's better to disassemble it and braze it once again, especially when using bronze brazing rods. 70% silver 30% copper works the best (with flux), but it's kinda expensive and needs really high temperature.