Join Date: Apr 2007
Location: Boston by way of Maine and Oregon
Bikes: the junk you sold at your last yardsale & a Jamis Nova, Redline 925, Rockhopper
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Stuck parts are always frustrating. I've yet to find a perfect solution. I'm just learning about bike repair after wrenching on motorcycles and small engines. Here's what I learned in my past life--
Try repeat applications of a good penetrating oil, like liquid wrench. This stuff works better than WD-40 for really tough job because it (go figure) penetrates better. Between applications, tap the crank or any bolts gently--you're simply trying to vibrate the parts to fracture the rust and let the oil work its way in there.
Be patient. It can take longer than a day. Repeat applications.
If that doesn't work, I've had luck with a propane torch, as cpb406 suggested. You can experiment with heating up the area and then spraying it with the oil (the idea is that when the parts cool capillary action will suck in the oil). That said, the stuff is flammable, so have a wet towel on hand and be careful about it (i.e. don't spray and torch at the same time, or don't re-torch after you've just sprayed.)
Lastly, good tools can make a huge difference. As tellyho said, a good wrench sleeved onto a pipe can be out of this world.