Got a riding mower with a 12.5HP Briggs engine. There is about a 3" long piece of 1 inch diameter pipe sticking out of the engine, which is for a muffler. The muffler apparently rusted out leaving just a ring of it on the pipe threads. I put a pipe wrench on that metal, and can not budge it. I tried to both remove that remaining metal, or the whole pipe from the engine. I tried to turn it both directions, and lifter the whole mower off the ground. Still nothing will budge.
With this pipe being screwed into an aluminum head, I dont want to break the head. I thought about heating the remains of that old muffler then applying a wrench, but it's heat that (sort of) welded it on there in the first place.
Anyone know any trick to remove this (without wrecking the pipe threads)?
Thanks