My crank pulley is broken. Think its the crank pulley. The metal ring with the 5 ribs has broken away from the rest of the pulley. The idler pulley attaches to it and its the pulley that drives the alternator and ac compressor. It's the 5 rib pulley. Anyway, is it replaceable? Anything i should be wary of?

 

so just replace the dampener, check your keyway as well.

 

Gonna give that a try. Also didn't mean idler pulley, guy at o'reilly put idler pulley on my brain.