When you say you're "heating it up", what are you using for your heat source and what is it you're heating? You'll never get it hot enough to free up using a propane torch; you need acetylene. Also, you can't heat the aluminum, as it will melt before you get it hot enough.
You need to directly heat the plug; it will break free once it's hot enough. Get your pipe wrench adjusted and ready, then heat the plug with an acetylene torch. Try not to heat the surrounding aluminum; focus the flame on the plug. As soon as the plug starts to glow red, grab the pipe wrench and try to turn the plug. If it doesn't turn easily, apply more heat. It seems counter-intuitive that heating the plug will free it, but it will; you're breaking the chemical bond between the iron and aluminum. Note that if you get the plug too hot, there's a risk of setting the oil in the pan on fire, but most likely it will just boil.
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Today's Featured Article - New Hitches For Your Old Tractor - by Chris Pratt. For this article, we are going to make the irrational and unlikely assumption that you purchased an older tractor that is in tip top shape and needs no immediate repairs other than an oil change and a good bath. To the newcomer planning to restore the machine, this means you have everything you need for the moment (something to sit in the shop and just look at for awhile while you read the books). To the newcomer that wants to get out and use the machine for field work, you may have already hit a major roadblock. That is the dreaded "proprietary hitch". With the exception of the
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