Dayco PB1684N Engine Harmonic Balancer

Premium OEM Replacement Balancer

Dayco PB1684N is an engine harmonic balancer built for direct replacement applications that require neutral balance and timing mark visibility. It is engineered with a cast iron outer ring and a single serpentine pulley groove set for 7 grooves, making it a fitment-focused choice for Nissan and INFINITI V8 applications.

• Neutral balance design with no counterweight
• Cast iron outer ring for durable engine service
• Integrated serpentine pulley with 7 grooves
• Timing marks included for service alignment
• Six-bolt hole configuration

Detailed Product Overview

This Dayco harmonic balancer, part number PB1684N, is a Premium OEM Replacement Balancer designed around the dimensions and pulley layout needed for specific Nissan and INFINITI engines. The 1.220-inch crank bore, 6.497-inch overall outside diameter, and 2.540-inch overall width support accurate crankshaft damping and accessory drive alignment. The neutral balance design and no-exciter-plate construction keep the part focused on standard replacement use. PB1684N is a practical option for Nissan TITAN, Nissan Armada, Nissan Pathfinder, Nissan NV2500, Nissan NV3500, and INFINITI QX56 applications where the original balancer specification matters. This part cross-references Dorman 594-434 for the same application.

Common Replacement Uses

• Restores crankshaft vibration damping when the original balancer is worn or damaged
• Addresses timing mark visibility issues during engine service
• Replaces a balancer with pulley wear, ring movement, or imbalance concerns
• Supports accessory drive alignment when the original unit no longer runs true
• Provides a direct replacement for specified Nissan and INFINITI engine applications

Installation Notes and Tips

Verify crank bore, pulley groove count, and overall diameter against the original part before installation. Confirm timing mark orientation during assembly and follow the vehicle service procedure for torque and alignment. Hardware and installation instructions are not included.

Quality Assurance

Dayco positions this part within its Premium OEM Replacement Balancer line, indicating an OE-style replacement focus for engine service applications. Part number PB1684N is built to match the dimensional and functional requirements of the listed fitments.