Crank bolt torque for timing belt change (10v) - why an extension mutiplies torque

[Phil Payne]

> t1 = t2 * (d1+d2)/d2
>
> Therefore the torque delivered to point 1 is the torque delivered at point 2
> multiplied by the ratio of the overall length to the length of the torque
> wrench. This is how the torque gets multiplied. It does in fact matter how
> long the torque wrench is and how long the extension is.

Yup.

The Sykes-Pikavant torque wrench I use is the centre-breaking variety - it's about five feet
long and breaks in the middle.

The manual is QUITE specific about how it is to be held - one hand in the exact centre of a
padded rubber grip.  If two hands are used, they must overlap one another.

--
  Phil Payne
  http://www.isham-research.com
  +44 7785 302 803