On May 13, 11:19=A0am, Dave English <dave.engl...@[EMAIL PROTECTED]
> wrote:
> In message <g09fp0$4c...@[EMAIL PROTECTED]
>, Keith W
> <invalidaddr...@[EMAIL PROTECTED]
> writes
>
>
>
>
>
>
>
> >"Dave English" <dave.engl...@[EMAIL PROTECTED]
> wrote in message
> >news:$X9v$VJHs+JIFAFx@[EMAIL PROTECTED]
> >> In message <20080508184011.0ac241fc@[EMAIL PROTECTED]
>, Chris
<ch...@[EMAIL PROTECTED]
>
> >> writes
> >>>Yes that is the ones 55NM 41lbf ft chapter 10 page 10.1 i had to redo
> >>>mine about 12 weeks ago as i had a noise coming from the top.
>
> >>>the only
> >>>problem is you have to use a key in the middle and a spanner on the
nut=
> >>>so how you are going to get the right torque i dont know , just pull
> >>>till tight and dont move about ,
>
> >> I haven't had to try it myself, but I'd be at least tempted to
tighten =
the
> >> nut with the spanner & key to roughly half torque - then finish with
a
> >> socket & a torque wrench - hoping the stud wouldn't try to turn
further=
..
>
> >> Alternatively, you can do it using both a spanner & a socket torque
> >> wrench. =A0Put the spanner on the nut, then a tightened nut & bolt
say =
in
> >> the opposite end of the spanner with the torque wrench also on that
nut=
&
> >> bolt. It can be a bit unwieldy, but it works because the torque is
the
> >> same anywhere along the length of the leaver. =A0The same trick is
usef=
ul
> >> for a limited access problem, if you really care that much about the
> >> torque.
>
> >That can't be right.
>
> Sorry, but it is
>
> > =A0 If you use a longer lever, i.e. a spanner and a
> >lever, then the same amount of pressure at the end of the lever exerts
> >greater turning power on the nut. =A0 =A0E.g. a pull of 20 pounds 12
inch=
es from
> >the nut is 20 foot/pounds. =A0 =A0A pull of 10 pounds 24 inches from
the =
nut
> >also gives 20 foot pounds. =A0 Therefore applying the same torque to
the
> >extended lever will greatly over tighten the nut.
>
> Applying a force somewhere along a lever produces a varying torque.
>
> Applying a torque somewhere along a lever always applies the same torque
> regardless..
>
> Regards
> --
> Dave English- Hide quoted text -
>
> - Show quoted text -
Keith's statement is true, but in the case you suggest, the torque
(measured in Ft lbs, or newton meters) is being measured halfway along
the lever, so gawd knows what the real torque at the nut will be.
However, since the nut is readily accessible for a torque wrench
directly, this is academic.
I would just tighten it up as much as you can using the 7mm allen key,
and 21mm spanner.
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