- It drives the timing belt or chain, which in turn synchronizes the rotation of the crankshaft and camshaft(s).
- It provides a surface for the serpentine belt to wrap around, which drives various engine accessories such as the alternator, power steering pump, air conditioning compressor, etc.
- It acts as a damper to reduce torsional vibrations generated by the engine.
The crankshaft pulley is typically attached to the crankshaft using a keyway, bolts, or a combination of both. It may also have a harmonic balancer integrated into it, which further helps in reducing vibrations.
