what would cause my crankshaft pully to come out of line of the others by a inch on 1998 Chevrolet Monte Carlo

its making my belt jump off the crankshaft pully. how to fix?

Asked by for the 1998 Chevrolet Monte Carlo
The crankshaft pulley needs to be replaced. It is a two piece design & with age they come apart.
1 more answer
Replace the Crankshaft pulley, the rubber dampener on the inside of the pulley goes bad and allows it to walk off the crankshaft sometimes.