Harmonic Balancer page:

All Other than Corvair

Chevrolet Corvair

. Harmonic Balancers (also known as vibration dampeners [ dampers] or pulleys) are fitted to the crankshafts of some engines in order to control the torsional (twisting) vibration of the crankshaft. The need for this often stems from increasing the stroke of the engine which makes the crankshaft overly flexible (twisty). If something is not done to keep this flexing vibration to less than 1/2 of one degree then the crankshaft may develop cracks. . The harmonic balancer consists of the hub (bolted to the crankshaft), an outer weight ring (usually of cast iron) and a sandwiched layer of flexible rubber. . This rubber absorbs the energy of the vibrating crankshaft in the form of heat, damping the amount of vibration to within safe limits. The rubber may deteriorate from heat, becoming hard and brittle, or from oil it may begin to soften and decompose. . We replace this rubber strip with modern high-temperature black silicone mold making rubber, restoring its function.

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