Product Awareness Torsional Vibration Dampers The Torsional Vibration Damper (TVD) pulley is the pulley on the end of the crank that drives the accessories - alternator, water pump, and air conditioning compressor. Â The O.E. TVD pulley has a built-in harmonic damper, in the form of a split design, with a thick rubber pad sandwiched between two steel sheets. The damper is designed to absorb torsional and vertical vibrations from the crank. Torsional vibration is a twisting vibration caused by the firing of each piston. The force of the piston causes the crank to deflect ever so slightly in the direction of the force, and when that force goes away the crank ever-so-slightly springs back. At certain frequencies the crank can resonate, making the vibration much worse. This is where the harmonic damper comes into play. Although some competitors have removed the harmonic damper from the crank pulley, doing so almost certainly increases crank bearing wear, and could lead to early failure of the crank or crank bearings.
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