Crankshaft pulley wobble

[ericparker1]

I have a 2006 mustang with a v-6.I bought this car used 2 weeks ago.I noticed the crankshaft pulley had some wobble.It only has 28,000 miles so I let the dealer look at it.They said there was nothing wrong with it. I still don't agree because if it's not running true, the belt is eventually going to wear out sooner.Does anyone have a clue what would be causing this?They said the crankshaft was fine.

 

[GrayPony]

Could be there was an under drive pulley installed and someone wasn't careful when they removed the stock pulley. (like prying it off with a screwdriver rather than using a puller). They could have just thrown the old one back on to sell or trade the car.
I would replace the pulley and bolt. (the bolt should not be re-used)

 

[ericparker1]

I took it to the dealership today for the 2nd time.They ordered a new pulley for it.Hopefully that will solve the problem.

 

[The Fang]

The timing sensor reads from the pulley on the crank. If there was a problem it would most likely not run right. Graypony is correct, someone may have pryed on it or got damaged some other way tho.