MarkB_MI said: (quoted from post at 19:51:57 03/02/09) In my experience, the best thing is to apply heat directly to the bolt until it starts to glow cherry red. Then drive it out hot. If it stops moving, reheat it and continue driving.
I never saw the logic in heating up a stuck bolt or pin, then quenching it. What you want to do is to reduce the friction between the parts, quenching the parts or allowing them to cool just returns things to how they were before you started.
The logic for heating and then letting it cool is to heat the bolt until it expands past its elastic limit. More heat will expand it more and cause the bolt to deform as it tries to expand larger than the hole. As it cools it will shrink. Since it has been deformed it will now have a smaller diameter than it had originally.
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