Dayco PB1377N Engine Harmonic Balancer

Dayco Premium OEM Replacement Balancer PB1377N

The Dayco PB1377N is a premium OEM replacement engine harmonic balancer built for specific Buick, Oldsmobile, and Pontiac applications. It is engineered with a ring-weighted counterweight balance, a cast iron outer ring, and an integrated crank trigger/exciter plate for accurate engine operation.

Key Features

• Premium OEM Replacement Balancer from Dayco
• Part number PB1377N
• Ring weighted counterweight balance
• Cast iron outer ring construction
• Integrated crank trigger/exciter plate
• Two integrated serpentine pulleys with 6 grooves each
• Overall outside diameter: 7.170 in. (182.10 mm)
• Overall width: 3.642 in. (92.50 mm)
• Crank bore: 1.373 in. (34.86 mm)
• Nose outside diameter: 1.934 in. (49.12 mm)

Product Details

Dayco PB1377N is an engine harmonic balancer for applications that require a direct-fit OEM replacement style component. The balancer uses a ring-weighted design to help maintain rotational balance, while the cast iron outer ring adds durability in demanding engine environments. With two integrated serpentine pulleys, this unit is configured for accessory drive layouts that use dual 6-groove belt paths. The crank trigger/exciter plate is included in the balancer design, and the unit does not use timing marks or a Woodruff key.

This part cross-references ATP 102108 and Dorman 594-161 for the same application. It is a fitment-based replacement for 1995 Buick Riviera, 1995 Oldsmobile 88, 1993-1995 Pontiac Bonneville, 1993-1994 Buick Park Avenue, and 1993-1994 Oldsmobile 98. Search terms such as Dayco PB1377N harmonic balancer for 1995 Buick Riviera or PB1377N engine balancer for 1993-1995 Pontiac Bonneville can help confirm the correct application.

What It Helps Address

• Engine vibration caused by a worn or damaged harmonic balancer
• Accessory drive issues related to pulley wear or misalignment
• Crankshaft damping concerns from a deteriorated balancer assembly
• Trigger signal concerns where an exciter plate is part of the original setup
• Fitment problems when replacing an OE-style balancer on Buick, Oldsmobile, or Pontiac engines

Installation Notes

Verify crank bore, nose diameter, pulley configuration, and trigger plate requirements before installation. This balancer is supplied without hardware and without installation instructions, so follow the vehicle service manual and use the correct torque procedure for the application. Confirm that the serpentine belt routing matches the dual-pulley layout before final assembly.

Quality Assurance

Dayco’s Premium OEM Replacement Balancer line is built for direct replacement applications where OE-style dimensions and configuration matter. PB1377N is specified for the listed Buick, Oldsmobile, and Pontiac vehicles, including 1995 Buick Riviera and 1993-1995 Pontiac Bonneville applications.