Date:         Fri, 26 Jul 2002 09:54:51 +0100
Reply-To:     Clive Smith <clive.harman-smith@NTLWORLD.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Clive Smith <clive.harman-smith@NTLWORLD.COM>
Subject:      Re: Lug nut madness
Content-Type: text/plain; charset="iso-8859-1"

I uften use copper-slip for the wheel nuts or studs in  a similar way....
but
as I also know why VW expressly discourage lubricants as such in this
area...
... for a given torque setting the force on the wheel can go through the
roof.
The clamping force (= stud stretching tension) is calculated for clean dry
threads normally
and the poor engineers making these calculations must be having kittens at
the thought
of what stresses are reached when when an air-tool jockey runs riot on clean
threads  good oil could do!

... everything on motor vehicles is hopefully sized not for its design
stresses but for
these sorts of contingencies... not so in the aviation world.


Clive
'88 Syncro Transporter

----- Original Message -----
From: "Jfp w/2 wbxs" <jfp7@HOTMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Friday, July 26, 2002 4:23 AM
Subject: Lug nut madness


> Hi All,
>
> I once had new radial R tires installed on a '79 loaf and insisted on
> standing by the tire replacement action (brought my own safety glasses). I
> mentioned to the installer that I wanted a torque wrench used to tighten
the
> wheel nuts and he said "OK, no problem". A moment later I swear I heard
his
> ask a workmate, what's a torque wrench???? I immediately took up the issue
> with the service manager and they found the shop's torque wrench and used
> it. Was the tool even accurate? When I got home I loosened and retorqued
the
> wheel nuts with MY torque wrench.
>
> While it is espressly discouraged by VW, I put a SMALL amount of oil on
the
> threads before torqueing wheel bolts or nuts to be sure the applied torque
> is reached evenly on all wheel fasteners. 133 ft. lbs. to one wheel bolt
may
> only be 100 ft. lbs. to the next due to corrosion. Any pneumatiic
> overtightening is the work of untrained laymen usually working flatrate.
>
> Regards,     John
>
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