Dayco PB1297N Engine Harmonic Balancer

Dayco Premium OEM Replacement Balancer PB1297N

The Dayco PB1297N is a premium OEM replacement engine harmonic balancer built for Toyota applications that need accurate crankshaft damping and reliable accessory drive alignment. It is a direct-fit style balancer for 1988-1995 Toyota 4Runner, 1988-1995 Toyota Pickup, and 1993-1994 Toyota T100 applications.

Dayco’s Premium OEM Replacement Balancer line focuses on OE-style fit and function for engine service work where the harmonic balancer must match factory dimensions and timing reference requirements. The PB1297N includes timing marks and a dual-pulley design for V-belt and serpentine accessory drive layouts.

Key Features

• Engine harmonic balancer for Toyota truck and SUV applications
• Fits 1988-1995 Toyota 4Runner, 1988-1995 Toyota Pickup, and 1993-1994 Toyota T100
• Neutral balance design with no counterweight
• Cast iron outer ring for durable engine damping service
• Two integrated pulleys: 1-groove V-belt and 4-groove serpentine
• Timing marks included for service and alignment checks
• Crank bore: 31.00 mm; nose outside diameter: 45.00 mm
• Overall outside diameter: 159.00 mm; overall width: 57.80 mm
• 4-bolt hole design

Detailed Description

The Dayco PB1297N harmonic balancer is engineered for Toyota engines that require a neutral-balance replacement with factory-style pulley geometry. Its cast iron outer ring, 159.00 mm overall diameter, and 57.80 mm overall width support stable crankshaft vibration control while maintaining accessory drive alignment. The dual pulley arrangement combines a V-belt groove and a 4-groove serpentine pulley, making it a practical choice for service on Toyota 4Runner, Toyota Pickup, and Toyota T100 models within the listed years. The part number PB1297N is also referenced by ATP 102099 and Dorman 594-078 for the same application.

What It Helps Address

• Crankshaft vibration from a worn or damaged harmonic balancer
• Accessory belt misalignment caused by pulley wear or hub damage
• Timing mark visibility issues during engine service
• Noise or imbalance related to a deteriorated balancer assembly
• Fitment problems when replacing an OE-style Toyota balancer

Installation Notes and Tips

Verify crank bore, nose diameter, bolt-hole pattern, and pulley configuration before installation. This balancer does not include hardware, installation instructions, a crank trigger/exciter plate, or a Woodruff key. Use the timing marks during setup and confirm belt alignment after installation on the Toyota 4Runner, Toyota Pickup, or Toyota T100 application.

Quality Assurance

Dayco’s Premium OEM Replacement Balancer line is built as an OE-style service part for engine repair and replacement work. The PB1297N is specified with defined dimensions, pulley types, and timing marks to support accurate fitment and repeatable service results.