Dayco PB1237N Engine Harmonic Balancer

Dayco PB1237N Harmonic Balancer Overview

The Dayco PB1237N is a premium OEM replacement harmonic balancer for GM V6 applications that rely on a hub-weighted design and integrated serpentine pulley. It is built for direct replacement service on vehicles such as the Chevrolet Impala, Monte Carlo, Buick Regal, and Pontiac Grand Prix.

Dayco’s Premium OEM Replacement Balancer line focuses on accurate fit, OE-style construction, and dependable crankshaft vibration control for everyday repair work.

Key Features

• Hub-weighted counterbalance for crankshaft vibration damping
• Cast iron outer ring for durable rotating assembly support
• Integrated 6-groove serpentine pulley
• Crank trigger/exciter plate included
• 3-bolt hole design for application-specific mounting
• Crank bore: 1.373 in. (34.86 mm)
• Nose outside diameter: 1.934 in. (49.12 mm)
• Overall outside diameter: 7.048 in. (179.00 mm)
• Overall width: 3.323 in. (84.40 mm)
• Ring width: 1.910 in. (48.49 mm)
• Installation instructions included

Detailed Description

The Dayco PB1237N harmonic balancer is engineered as an OEM-style replacement for engines that use a single integrated serpentine pulley and crank trigger/exciter plate. Its hub-weighted balance design helps maintain smooth crankshaft operation, while the cast iron outer ring provides the mass and durability expected in a replacement balancer for GM passenger cars and performance-oriented coupes. This part cross-references Dorman 594-004 for the same application.

Compatible With 2000-2005 Chevrolet Impala, N/A; 1998-2005 Chevrolet Monte Carlo, N/A; 1995-2004 Buick Regal, N/A; 1997-2003 Pontiac Grand Prix, N/A; 1995-1999 Buick LeSabre, N/A; 1995-1999 Buick Park Avenue, N/A; 1998-1999 Chevrolet Lumina, N/A; 1995-1999 Oldsmobile 88, N/A; 1998-1999 Oldsmobile Intrigue, N/A; 1996-1999 Oldsmobile LSS, N/A; 1996-1999 Pontiac Bonneville, N/A; 1997-1998 Oldsmobile Regency, N/A; 1995-1997 Buick Riviera, N/A; 1995-1997 Chevrolet Camaro, N/A; 1995-1997 Pontiac Firebird, N/A; 1995-1996 Oldsmobile 98, N/A; 1995 Chevrolet Lumina APV, N/A; 1995 Oldsmobile Silhouette, N/A; 1995 Pontiac Bonneville, N/A; 1995 Pontiac Trans Sport, N/A.

Common Repair Applications

• Engine vibration or harmonic imbalance at idle and under load
• Worn, cracked, or delaminated balancer components
• Serpentine belt drive noise caused by pulley wear
• Crankshaft trigger signal issues on supported applications
• Front-end engine service on Chevrolet Impala, Monte Carlo, Buick Regal, and Pontiac Grand Prix models

Installation Notes

Verify crank bore, nose diameter, pulley groove count, and trigger/exciter plate requirements before installation. This balancer does not include hardware or a woodruff key, and timing marks are not provided. Use the included installation instructions and confirm alignment with the vehicle’s accessory drive and crankshaft configuration.

Quality Assurance

Dayco’s Premium OEM Replacement Balancer line is built for direct-fit service replacement with OE-style dimensions and construction details. The PB1237N is intended for applications that require a balanced harmonic damper with integrated serpentine pulley support and crank trigger compatibility.