Posted by Owen Aaland on August 06, 2009 at 12:50:06 from (65.174.247.87):
In Reply to: Repairing my Radiator posted by chad504 on August 06, 2009 at 09:14:32:
The big advantage of an acetylene torch is you can use a small tip to concentrate the heat where you want it. I have also had good results with a butane torch.
Cleaning is probable the hardest part and you have a good start on that. Do not use more than 10 PSI of pressure to find the leaks. The way the tanks are shaped on the old style radiators will not take the pressures a modern radiator uses without deforming.
Mark all the locations where you find leaks. Use a small wire brush, emery paper, or a pick to completely clean the area around the leak. Use an acid type flux to cover any areas you have cleaned and are going to solder.
The solder I use is designed for radiator work and has a higher content of acid flux than normal acid core solder. I still use flux paste also because radiators are almost impossible to get completely clean and the extra flux helps carry the crud away from where you need the solder.
Apply enough heat to the radiator to get the solder to flow where you applied the flux. You need to keep the heat to a minimum because every thing is assembled with solder and if you get it hot enough to flow the new solder you can also melt solder where you do not it to melt.
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