assuming the collar is accessible, i'd heat that. keep in mind that rust is hydrated iron oxide, Fe2O3ĚnH2O which expands as it forms. so when you heat it sufficiently to break the chemical bonds and drive off the water, the remaining iron takes up much less space than the rust, loosening the joint. so in the case of the bolt stuck in an engine block, yes, heating the bolt will expand it making it tighter except that when the rust shrinks it will be looser.
whatever the theory, my experience is if the part is heated to cherry red-and sometimes it doesn't even need that hot- it comes apart easily.
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