Dayco PB1146N Engine Harmonic Balancer

Premium OEM Replacement Balancer for Toyota and Lexus

The Dayco PB1146N is a premium OEM replacement harmonic balancer built for select Toyota and Lexus V8 applications. It is engineered with a neutral balance design, timing marks, and a cast iron outer ring for direct-fit service on compatible engines.

Dayco’s Premium OEM Replacement Balancer line focuses on OE-style fit and function for engine service work where accurate crankshaft damping and timing reference are important. The PB1146N follows that approach with a serpentine pulley, integrated pulley design, and application-specific dimensions for a precise replacement.

Key Features

• Brand: Dayco Premium OEM Replacement Balancer
• Part number: PB1146N
• Neutral balance design with no counterweight
• Cast iron outer ring construction
• Integrated serpentine pulley with 6 grooves
• Timing marks included
• Crank bore: 1.380 in. / 35.04 mm
• Overall outside diameter: 6.260 in. / 159.00 mm
• Overall width: 2.788 in. / 70.80 mm

Detailed Description

The Dayco PB1146N harmonic balancer is a direct replacement for select 1998-2009 Toyota and Lexus trucks and SUVs, including the Lexus GX470, Toyota 4Runner, Toyota Sequoia, Toyota Tundra, Lexus LX470, and Toyota Land Cruiser. It is built with a neutral counterweight balance, a cast iron outer ring, and a single integrated serpentine pulley to match the original engine accessory drive layout. Timing marks are included for service and alignment work, and the balancer uses a 2-bolt hole pattern with no crank trigger/exciter plate, no woodruff key, and no included hardware.

This part cross-references ATP 102185 and Dorman 594-203 for the same application. If you are replacing a worn harmonic balancer on a Toyota Tundra, Toyota Sequoia, or Lexus LX470, PB1146N provides the OE-style dimensions and pulley configuration needed for a proper service replacement.

What It Helps Address

• Crankshaft vibration caused by a worn or separated balancer
• Timing mark visibility issues during engine service
• Belt drive noise related to a damaged pulley surface
• Accessory drive alignment problems from an out-of-spec balancer
• Engine service delays when the original harmonic balancer is no longer usable

Installation Notes and Tips

Verify crank bore, nose diameter, pulley groove count, and overall dimensions before installation. Confirm the vehicle application against the fitment list for 1998-2007 Lexus LX470, 2003-2009 Lexus GX470, 1998-2007 Toyota Land Cruiser, 2003-2009 Toyota 4Runner, 2001-2009 Toyota Sequoia, and 2000-2009 Toyota Tundra. Use the included timing marks for alignment, and transfer any required service components separately since hardware is not included.

Quality Assurance

Dayco’s Premium OEM Replacement Balancer line is built to match OE-style fitment and service requirements for engine repair. The PB1146N is specified for direct replacement use on confirmed Toyota and Lexus applications, with dimensions and pulley configuration listed to support accurate part selection.