[s-cars] More on audi wheel bolts/studs/torque

Bernie Benz b.m.benz at prodigy.net
Mon Oct 21 20:54:52 EDT 2002

The thermal considerations are of small importance. but higher temps will
slightly increase the clamping forces, because of the larger coeff of therm
exp of alum vs steel, which in turn will increase the creap deflections
within the aluminum, and thus reduce the cold dynamic clamping force. All
this assuming that we can ignore bolt friction changes caused by temp
changes in a poorly lubed bolt.

Backout torque is of no concenquence, unless you wish to remove the bolt.
Then you wish that it had been properly lubed.


> From: Robert Pastore <rpastore at animalfeeds.com>

> I guess I just added torque with each round of "clicks" when the stuff was
> very hot.   Then when it cooled, I was stuck.  Now I back off in reverse,
> then tighten to the spec.
> Bob

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