ATP 102231 Engine Harmonic Balancer Serpentine Belt Drive

The ATP 102231 is a direct-fit replacement engine harmonic balancer designed to restore proper crankshaft operation. The harmonic balancer — also called a crank damper or crankshaft dampener — absorbs the torsional vibrations generated by the crankshaft during engine operation. A typical balancer is built in three layers: a central hub that bolts directly to the crankshaft, a rubber or fluid damping layer that absorbs vibration, and an outer metal pulley ring with grooves for the serpentine belt. Over time, the damping layer deteriorates, causing the outer ring to shift forward, leading to belt misalignment and, if left unaddressed, potential crankshaft damage. The ATP 102231 replaces the failed unit with a part engineered to fit and function like the original.

Key Features:

• Standard replacement grade — engineered to match OE fit and function
• Serpentine belt drive design
• Inside diameter: 1.25 in (32 mm)
• Outside diameter: 7.0625 in (179 mm)
• Depth: 2.1875 in (56 mm)
• Bolts and washers are not included

Fits select 2002–2009 Buick, Chevrolet, GMC, and Oldsmobile vehicles including the TrailBlazer, Envoy, Rainier, and Bravada. Installation note: A second-generation seal kit is required for use with this part — use of the wrong seal kit can result in part and/or vehicle failure.