Posted by Bob Kerr on December 31, 2007 at 07:54:50 from (205.188.116.73):
In Reply to: Re: Water posted by Kristof on December 31, 2007 at 06:43:26:
I was told this trick by an OLD steam engine guy to get stuck fittings out of boilers. He said heat the bolt or stud close to red and keep it at that temp for a while and DON"T heat the block with the torch. That lets the heat penetrate all the way down into the iron at the threads. Then take a wet rag and quench the stud and wiggle it back and forth till it is out.As it comes out, blow the rust dust off with air. I use ice cubes to quench the stud. Heat expands the block and the ice shrinks the stud so you basicly get a small bolt in a large hole deal. Main thing is DON"T get in a hurry to unscrew them. If it gets tight as it comes out, heat it up again and re quench it. Sometimes thet are tight to the last turn. Penetrating oil will acually not be of much help as it can quench the block before you are ready to turn the stud and if it is that tight, it won"t get in the threads anyway. The guy who taught me that really knows his stuff and was still farming with his Rumley Advance steamers well into the late 60s.
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