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Automotive Spare Parts

CRANKSHAFT PULLEY

A harmonic balancer (also called crank pulley damper, crank-
shaft damper, torsional damper, or vibration damper) is a device
connected to the crankshaft of an engine to reduce torsional vi-
bration and serves as a pulley for drive belts.

Every time the cylinders fire, torque is imparted to the crank-
shaft. The crankshaft deflects under this torque, which sets up
vibrations when the torque is released. At certain engine speeds
the torques imparted by the cylinders are in synch with the vi-
brations in the crankshaft, which results in a phenomenon called
resonance. This resonance causes stress beyond what the crank-
shaft can withstand, resulting in crankshaft failure.

These vibrations from the engine can become too much for
the crankshaft to bear, causing it to fail. And when that happens,
your car won’t run and you’ll be facing some expensive repairs.

To prevent this vibration, a harmonic balancer ( crankshaft
pulley ) is attached to the front part of the crankshaft. The damp-
er is composed of two elements: a mass and an energy dissipat-
ing element. The mass resists the acceleration of the vibration
and the energy dissipating (rubber/clutch/fluid) element absorbs
the vibrations.

In essence, the device ( crankshaft pulley ) is designed to
help prevent crankshaft failure. If you don’t want to have trouble
caused crankshaft failure, you should make the right crankshaft
pulley choice.

İmportant !!!
Pulleys should be checked every 90,000 km and replaced togeth-
er with the bolts and belts.

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