Crankshaft pulleys with bonded rubber dampers.
These pulleys reduce engine vibration and drive the belt system. A failing damper can cause belt noise, wobble or charging issues. Match outer diameter, belt profile and keyway design. Check for cracks in the rubber layer. A stable pulley helps protect accessories from vibration damage.
Damper separation or loose mounting can cause wobble.
A worn pulley, misalignment or poor tension.
Many workshops replace worn pulleys during belt changes.