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?

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2 answers
The crankshaft pulley needs to be replaced. It is a two piece design & with age they come apart.
Replace the Crankshaft pulley, the rubber dampener on the inside of the pulley goes bad and allows it to walk off the crankshaft sometimes.