(2) When you heat the bolt, you send the heat down the bolt. This
causes it to expand, and then it shrinks as it cools, loosening the
binding. Also, expansion and contraction can be very local.

That's what I do on outboard motors with alum blocks etc. Very difficult to
drill a stainless bolt stub out of an alum block (. I then let the bolt cool
and before attempting to remove it, heat the area around it to expand it. Then
I try the bolt. Usually works on the first or second try.
Greg Sefton

On 12 Mar 2004 13:49:58 GMT, (Bray Haven) vaguely
proposed a theory
.......and in reply I say!:
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That's what I do on outboard motors with alum blocks etc. Very difficult to
drill a stainless bolt stub out of an alum block (.

Not something I have tried, or look forward to with any pleasure.

I then let the bolt cool
and before attempting to remove it, heat the area around it to expand it. Then
I try the bolt. Usually works on the first or second try.

I guess with Auminium, "warm" would be more appropriate than "heat"
G. But yes, heating the surroundings a bit does help.


Greg Sefton

************************************************** ** sorry

..........no I'm not!
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