[s-cars] Replacing Spark Plugs after Compression Test

[Fred Munro]

Dave, I think the problem is that some owners install/have the plugs
installed and never check them again. I've noticed mine loosen up after
they're first installed, but after the first re-torque they stay tight. But
then I use (dare I say it?) antiseize on the threads, so my effective torque
values are probably higher than the 22 ft-lb. the wrench reads.
If you don't retorque the plugs, I'd imagine they gradually back out until
one blows out.

Fred Munro
'94 S4

-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com]On Behalf Of Dave Forgie
Sent: February 3, 2004 7:59 PM
To: s-car-list at audifans.com; strangconst at rogers.com;
vfregeac at sympatico.ca
Subject: Re: [s-cars] Replacing Spark Plugs after Compression Test


I won't deny that the non-torque wrench, re-used plug/crush washer scenario
isn't real.  I am just looking for the reason that some people (several
recently over on AudiDoodiWorld) have blown plugs out of their heads.  If
everyone installed their new plugs to 22 lb ft and checked them periodically
(once a month or at least at every oil change), then why do plugs decide
they want to vacate the premisses?  There has to be a logical reason.  I was
going to the "crush washer as pretensioner spring" theory.  Obviously, the
flattened crush washer and a tonne (but undetermined amount) of torque can
also work.

Dave F.


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