"Dave English" <dave.english@[EMAIL PROTECTED]
> wrote in message
news:$X9v$VJHs+JIFAFx@[EMAIL PROTECTED]
> In message <20080508184011.0ac241fc@[EMAIL PROTECTED]
>, Chris <chris@[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. Put 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. The same trick is useful
> for a limited access problem, if you really care that much about the
> torque.
>
That can't be right. 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. E.g. a pull of 20 pounds 12 inches
from
the nut is 20 foot/pounds. A pull of 10 pounds 24 inches from the nut
also gives 20 foot pounds. Therefore applying the same torque to the
extended lever will greatly over tighten the nut.
--
Keith Willcocks
(If you can't laugh at life, it ain't worth living)
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