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Why heat bolt and not around bolt?
On 10 Mar 2004 02:56:28 GMT, (Fdmorrison) wrote:
(Don)
I am curious, is it best to heat the bolt head itself or around the
bolt? Will Heating the bolt heat make it more prone to snapping off?
It seems heating a bolt would make it expand, making it tighter?
By the way on all the other bolts I removed there was no rust.
I don't know the answer, but I think heating the "whole thing (mostly bolt) is
a good expedient to try--hoping that "after" cooling there is some loosening.
In a simpler situation, if you have a steel pin (no threads) stuck in a bore,
if you heat the piece in which the dowel is stuck it will cause the surrounding
metal to expand, so the bore gets bigger. So in this situation, heat the
piece, not the pin. And, pull the pin while you're still hot.
I don't think this applies directly to the stuck-bolt situation, though.
Frank Morrison
The theory is you want to break the rust structure. To do this, one
part needs to expand faster or more than the other. It is easier to
heat up the bolt than to heat the whole hole. Also, by heating and
expanding the bolt, when it cools it shrinks. Heat also helps any
penetrant penetrate.
WD 40 is a POOR lubricant and is not particularly effective on siezed
bolts. A 50 50 mix of Automatic trans fluid and laquer thinners does
a great job. Kroil, an old rust remedy, is basically just that.
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