I got lucky with a torch once. As you all know to get a cutting torch to cut you have to pre-heat what you want to cut. Over time I noticed that rust makes a reasonable heat insulator - like pre-heating something attached to something else that is rusted, the heat has trouble passing through the rust to the other part. I had a broken stud in an exhaust manifold (I think it was the one that connects the pipe to the manifold) that I could not get a drill near and didn't want to take it off because I was too lazy to pull the manifold off. Because everything was so rusty I thought maybe, if I went carefully, I could pre-heat the stud without heating the manifold itself, then the cutting jet wouldn't cut into the manifold and just blow the stud out. Believe it or not it actually worked! Blew the stud right out of the hole and didn't touch the manifold. Cleaned it up with a tap and it was good to go.
phil_n
This post was edited by phil_n at 18:27:13 03/03/15.
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