Some things don’t last forever, and the Harmonic Balancer on your 1993 Buick Century is one of them. The harmonic balancer is a circular device bolted to the front end of the crankshaft. It has an inner ring made of metal that bolts to the crankshaft, a middle ring made of a rubber compound that absorbs torsional forces from the crankshaft and an outer ring that holds the rubber in place and doubles as a pulley for the drive belt. The rubber eventually breaks down, causing the engine to vibrate excessively, leading in the worst case to catastrophic breakdown.
Tools Used: Tools, Crankshaft pulling tool #J38197, Socket wrench set, Breaker bar, Wrench set, Lug wrench, Jack and jack stands, Belt tension gauge
Install Harmonic Balancer
Removal In 2.2-liter Four Cylinder Engine
Disconnect the negative battery cable with a socket wrench or box wrench. Loosen the right front wheel lug nuts with a lug wrench. Jack up the vehicle and support it on jack stands. Remove the right front wheel, then remove the right engine splash guard by undoing the clips and screws holding it in place.
Remove the drive belt by loosening the alternator, adjusting the bolt with a socket wrench and then pulling the drive belt off the crankshaft pulley by hand. Use a socket wrench to loosen the crankshaft bolt. You may need to attach a breaker bar to your socket handle to loosen the bolt.
Attach the crankshaft pulling tool to the harmonic balancer by threading its three mounting bolts onto the balancer. Keep the crankshaft from rotating by jamming a piece of wood against the flywheel teeth or have a helper use a large flat-head screwdriver or crowbar to hold the flywheel in place as you loosen the bolt. Pull the harmonic balancer from the end of the crankshaft.