Dorman 594-623 Engine Harmonic Balancer

Dorman 594-623 Harmonic Balancer

Dorman 594-623 is a direct replacement engine harmonic balancer for select Chevrolet Colorado, GMC Canyon, Isuzu i-290, and Isuzu i-280 applications. It uses a stress-resistant rubber bond to absorb engine vibration, while ductile steel construction adds tensile and impact strength for long-term durability.

Key Features

• Direct replacement harmonic balancer for OE-style service
• Stress-resistant rubber bond helps absorb crankshaft vibration
• Ductile steel construction for added strength and durability
• 6-groove serpentine belt pulley design
• Black finish for a clean engine bay appearance
• Part number 594-623 for easy identification

Detailed Description

This harmonic balancer is built for engines that rely on a serpentine drive belt and a 6-groove pulley layout. With a 184 mm outside diameter, 32 mm inside diameter, 34.3 mm depth, and 47.6 mm mounting hole diameter, Dorman 594-623 is engineered to match the original fit and function of the factory balancer on select 2004-2012 Chevrolet Colorado and GMC Canyon models, plus 2006 Isuzu i-280 and 2007-2008 Isuzu i-290 applications. If you are replacing a worn Chevrolet Colorado harmonic balancer or a GMC Canyon harmonic balancer, this part number 594-623 provides a direct replacement solution.

This part cross-references 12578072 and PB1811N for the same application.

What It Helps Fix

• Engine vibration felt through the crankshaft and accessory drive
• Rubber bond deterioration in the original balancer
• Wobble, noise, or imbalance at the front of the engine
• Wear related to a damaged serpentine belt pulley surface
• Fitment issues caused by a failed OE-style harmonic balancer

Installation Notes and Tips

Verify pulley groove count, diameter, and mounting dimensions before installation. Inspect the crankshaft snout, belt alignment, and surrounding accessory drive components for wear or damage before fitting the new balancer. Because the center bolt and washer are not included, reuse or source the correct fasteners separately as required by the vehicle application. Confirm the engine configuration against the vehicle listing before ordering.

Quality Assurance

Dorman designs this harmonic balancer as a direct replacement part with ductile steel construction and a vibration-absorbing rubber bond to support dependable service in select Chevrolet Colorado, GMC Canyon, Isuzu i-280, and Isuzu i-290 vehicles.