Posted by NCWane on May 22, 2012 at 06:50:04 from (69.40.232.132):
In Reply to: pinhole in oil pan posted by mkirsch on May 22, 2012 at 06:10:41:
Being an oil pan it's a bit thicker than some other tanks so I'd probably braze it. That being said, I've also had good luck using a small diameter, low melting temp solder to repair corroded places where there were multiple pin holes that showed up after cleaning the area to repair the one pin hole that origionally needed repair. In that case the sheet metal on the tank was relatively thin anyway, as compared to most oil pans, so I knew it wouldn't take the heat needed to braze it without melting completely and forming large holes that wouldn't be easily repairable. In that instance I used a really fine/small diameter solder designed for doing electronics, but I have even used standard 50/50 solder like you'd use for nonpotable, copper water pipes. As far as brazing rod, just use as small of a diameter rod as you can get to limit the amount of heat needed to be put into the repair to get the rod to melt before the base metal in the pan does.
The main thing doing either type repair is to get the area as clean as possible so the braze or solder will bond to the metal/Tin and flow out to give a good repair. At one point in time Dad had some nearly pure muratic acid that worked great for leaning things prior to soldering or brazing. Nowdays I use a dilluted muratic acid that is designed for cleaning out piping systems. Although it isn't as good as the pure stuff it will remove any oil, grease, etc that tends to the repair metal from bonding. Beyond that all I can say is good luck.
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