Disconnect the battery and remove the fan assembly and crankshaft belts. Remove the center bolt from the pulley and use a crankshaft pulley remover to pull off the pulley. You can usually borrow one from an auto parts store.
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The pulley alone unbolts from the harmonic balancer (aka vibration damper). It's the harmonic balancer that requires a special puller to remove it from the crankshaft without doing any damage.
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