Actually that Q was used in a trivia contest. The answer is no, it gets
bigger.
Mike
----- Original Message -----
From: "John F Sandhoff" <sandhoff@csus.edu>
To: <datsun-roadsters@autox.team.net>
Sent: Wednesday, May 02, 2001 5:33 PM
Subject: RE: Re: How tight should a spark plug be?
> In regards to tight spark plugs, it was written:
> > You also might try getting the engine up to normal running temperature
> > before attempting to remove the plugs. As aluminum expands at a
> > faster rate than steel, the plug hole should open up slightly more than
> > the plug expands in it thus making the plug a bit easier to remove
> > without damage.
>
> I'm not a machinist, but if aluminum expands, won't such expansion
> actually squeeze the hole smaller since the expanding metal has to
> go _somewhere_?
>
> To my knowledge, torqueing a spark plug on a hot head is likely to lead
> to needing to experiment with installing helicoil inserts :-)
>
> -- John
> John F Sandhoff sandhoff@csus.edu Sacramento, CA
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