Dayco PB1256N Engine Harmonic Balancer

Overview

Dayco PB1256N is a premium OEM replacement harmonic balancer for select Toyota applications. It is built with a neutral balance design, a cast iron outer ring, and timing marks for accurate engine service.

Key Features

• Neutral balance design with no counterweight.
• Cast iron outer ring for durable engine damping.
• Integrated serpentine pulley with 5 grooves.
• Timing marks included for service alignment.
• 4-bolt hole configuration with a 32.80 mm crank bore.

Detailed Description

This Dayco harmonic balancer, part number PB1256N, is engineered as a premium OEM replacement for engines that require controlled crankshaft vibration damping and accessory drive support. The unit measures 145.00 mm overall outside diameter, 59.00 mm overall width, and 46.00 mm nose outside diameter, with a 140.00 mm pulley outside diameter and a 26.80 mm ring width. The integrated pulley uses a serpentine profile with 5 grooves, and the balancer includes timing marks for setup and inspection. PB1256N cross-references ATP 102153, Dorman 594-141, and Pioneer DA-29 for the same application.

Compatible With Toyota Tacoma, Toyota 4Runner, and Toyota T100 applications listed below. Use PB1256N when replacing a worn harmonic balancer that shows pulley wear, timing mark visibility issues, or imbalance-related vibration. This part number, PB1256N, is a direct fit for the specified Toyota engine applications and supports the original accessory drive layout.

What It Is Used For

• Engine vibration from a deteriorated balancer.
• Worn or damaged serpentine pulley surfaces.
• Timing mark visibility during service work.
• Crankshaft damping concerns caused by imbalance.
• Accessory drive noise related to balancer wear.

Installation Notes and Tips

Verify crank bore, bolt pattern, pulley groove count, and overall dimensions before installation. This balancer does not include hardware, installation instructions, or a Woodruff key. Confirm timing mark orientation and inspect the crankshaft snout and pulley alignment during replacement.

Quality Assurance

Dayco positions PB1256N as a premium OEM replacement balancer for service applications that require accurate fit and function. Part number PB1256N is built to match the listed Toyota fitments and maintain the original engine accessory drive configuration.