And then you get the idiots who use an impact wrench to put the wheel
nuts on cross-threaded.
Simon
On Thu, Jun 2, 2011 at 10:30 AM, The Roxter <rocknatural@gmail.com> wrote:
> On 6/2/2011 3:19 AM, Paul Hunt wrote:
>>
>> 60ft lb. 75 ft lb should be avoided but shouldn't do any damage on an
>> MGB, but could on cars with a smaller diameter stud like the Midget. A
>> while ago I had two tyres replaced somewhere I hadn't used before. Unlike
>> other places I have used owners are forced to spectate from a separate
>> enclosed area through a window for 'elfin safety'. It looked to me like
he
>> used an air gun to do the nuts up until it chattered, and only used the
>> torque-wrench to check that they weren't under-tightened (instead of
>> spinning the nuts on with the gun or brace and then using the
torque-wrench
>> for the actual final tightening). On return home I started checking how
>> much force was needed to undo them with my torsion-bar torque-wrench. The
>> first needed 100ftlb, the second got up to 120 then the torsion bar
snapped,
>> I had to undo the rest with a breaker bar. After that most of the nuts
felt
>> wobbly on the threads (loose on the stud, not clamping the wheel), whereas
>> the rears didn't. Swapping fronts to rears the rear nuts on the front
studs
>> felt OK, but the front nuts on the rear studs were still wobbly, so I
>> replaced all the nuts (V8 so not cheap) as a precaution. Of course, a
>> complaint to the fitting company got nowhere, even involving Trading
>> Standards.
>>
>> Having said all that I never have used a torque wrench when refitting
>> wheels, but simply lean down hard on the standard tool, stamping down on
it
>> always loosens them. After the above and out of interest I did try
>> tightening to 60 with my (new!) torque wrench and loosening as I usually
do,
>> and vice-versa, and found it came out at about 60-65 ftlb. If you use one
>> of those girly expanding wrenches you should tighten the nuts with it
>> closed, or use the vehicle manufacturers tool, and only use the expanded
>> wrench or breaker bar for undoing.
>
> It took me a couple of days to find out who to complain to about a similar
> matter, where a tire company torqued the wheel nuts on a friend's Honda so
> tight they would not unfasten. That's actually a potentially
> life-threatening error. I want a State Law that forbids using an impact
> wrench to tighten wheel nuts.
>
> -Rocky Frisco
> --
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