55, although it may seem counterintuitive, heating the bolt rather than the surrounding material works. The thing to remember is you're trying to disturb the bond between the threads in the fastener and the threads in the hole. Moving either one will break that bond. It is MUCH easier to get the fastener hot enough to expand than it is to get the surrounding material to expand. Not only is there much less material to heat, the thread corrosion serves as a insulator to concentrate the heat in the fastener.
This method works particularly well with aluminum castings. Try to heat an aluminum casting hot enough to release a steel fastener, and you're likely to blow a hole through the casting. On the other hand, you can apply a lot of heat to the fastener without worrying about the aluminum.
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Today's Featured Article - Two-Brush Generators - by Chris Pratt. Whether for product liability or because the aftermarket parts and labor business is lucrative, this concept is disturbingly prevalent. Fortunately when you step into your shop and make that jump 50 years back in time to work with your old tractor, this concept goes out the window. Even so, when it comes to the charging system, people quickly revert to this idea and start replacing the major components one at a time until it works. The reason you don't find any decals in your replacement set wit
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