[s-cars] Crank woodruff key questions

[Dave Forgie]

Sean:  I have never seen the actual pulley (I had the timing belt done by
Otto at EuroOtto).  However, now that you point this out, I checked the
photo's that I had been looking at.  I think you are correct - the "key"
seems to be part of the pulley. Plus it is not very long - maybe 1 cm (??).
I honestly thought that the both the pulley and the nose of the crank had a
"female" groove and the woodruff key fit into them and would be, in my
imagination, say 3 cm long.  Yikes!! No wonder the crankbolt has to have so
much torque.  Rather than relying on the shear resistance of the woodruff
key, everything is carried by the friction/clamping force of the crank bolt.
It now makes sense that most (if not all) woodruff "key" failures occur when
the crank bolt is undertorqued, i.e. the woodruff key is too small to take
the load by itself and it shears off.  Way to go team Doorhandle!!!

Dave F.

Sean Douglas wrote:

> Dave:
>
> Isn't the WK integral (attached) to the harmonic balancer (pulley)? I
> could be wrong, but when I did my TB, it looked like the key was part of
> the pulley.
>
> Sean
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