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Re: Autolite 3923 washer
- Subject: Re: Autolite 3923 washer
- From: Marco S Hyman <marc@xxxxxxxxx>
- Date: Thu, 10 Nov 2005 21:06:19 -0800
> My first question in response to your statement: "DO NOT apply Anti-Seize to
> spark plug threads. You will end up overtorquing the plug and stripping out
> the thread in the head" was:
> 1) <<If one uses a Torque Wrench and tightens the plug to the recommended
> torque setting (10 Nm for instance), how can the threads be stripped, regard
> less of whether or not an anti-seize compound is used?>>
I can answer that one. The recommended torque setting is specified as
either lubricated or dry. If specified dry, but you lubricate the device,
the clamping force will be *more* than that specified. The effect is
the same as over torquing.
Using your example, a 10 Nm reading using lubricated threads applies
much more clamping force than a 10 Nm reading using dry threads due to
the different coefficient of friction.
I do not know if the extra clamping force is enough to ruit threads.
I guess it depends how soft the threads.