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Engine idle; crank shaft pulley rotating but belt won't turn with it

(1999 Ford Taurus)
in Billings, MT on January 22, 2011

I have a similar problem which was posted before in this link

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on January 23, 2011
So the crankshaft pulley is not turning essentially? The crankshaft turns, the pulley does not?
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on January 23, 2011
thank you for your response daveJHM. my answer to your question is yes and yes.

its like there are 2 rotating pulley cascade together. the internal pulley rotates but the external pulley does not. thats how i can best describe it by looking at the engine while it is in idle.
on January 23, 2011
If I am not misaken, it's the pulley itself that requires replacement. It should be a dampner assembly - that is, connected by rubber to dampen engine vibration. The rubber may have torn, causing the pulley separation.
on January 23, 2011
if i am going to buy this part, how do you call this part? crank shaft pulley assembly?
on January 23, 2011
it looks like this
on January 23, 2011
Pretty much, but I would probably defer to a dealer part, just for overall part quality, longevity and fitment for something like that.
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