Dayco PB1683N Engine Harmonic Balancer

Premium OEM Replacement Harmonic Balancer

The Dayco PB1683N is a premium OEM replacement harmonic balancer for select BMW applications. It is built with a cast iron outer ring, neutral balance, and a single integrated serpentine pulley to support smooth crankshaft operation and accessory drive performance.

Compatible With BMW 128i, 323i, 325i, 325xi, 328i, 328i xDrive, 328xi, 330i, 330xi, 525i, 525xi, 528i, 528i xDrive, 528xi, 530i, 530xi, X3, X5, and Z4 applications across 2006-2013 model years. Part number PB1683N is a direct-fit style replacement for vehicles that use a 6-groove serpentine pulley setup.

• Brand: Dayco Premium OEM Replacement Balancer
• Part number: PB1683N
• Neutral balance, no counterweight
• Cast iron outer ring for durability
• 1 integrated pulley with 6 grooves
• Overall outside diameter: 169.00 mm (6.654 in.)
• Overall width: 45.20 mm (1.780 in.)
• Crank bore: 36.01 mm (1.418 in.)
• 6 bolt holes
• No timing marks, trigger/exciter plate, or woodruff key included

Product Details

Dayco PB1683N is an engine harmonic balancer used to help maintain crankshaft stability and accessory belt alignment in BMW engines. The premium OEM replacement balancer line focuses on OE-style fit and function, making this part a practical choice for BMW 328i, BMW X5, and BMW Z4 service work where the original balancer has worn, cracked, or lost damping performance. The 6-groove serpentine pulley and neutral balance configuration match the listed applications, while the cast iron outer ring supports consistent operation under normal engine loads.

Common Issues This Part Can Address

• Crankshaft vibration from a worn harmonic balancer
• Belt tracking problems caused by pulley wear or wobble
• Accessory drive noise related to a damaged balancer assembly
• Visible cracking or separation in the outer ring
• Engine vibration at idle or under load in BMW 328i, 528i, and X5 applications

Installation Notes and Tips

Verify crank bore, bolt-hole count, pulley groove count, and overall dimensions before installation. This PB1683N balancer does not include hardware, installation instructions, timing marks, or a woodruff key, so reuse or source the correct service components as required by the vehicle. Confirm fitment for BMW X5 models without Active Control Suspension, as noted in the application data.

Quality Assurance

Dayco’s Premium OEM Replacement Balancer line is built for OE-style replacement use in the listed BMW applications. Part number PB1683N is specified for 2006-2013 BMW 128i, 323i, 325i, 328i, 528i, X3, X5, and Z4 fitments, with application-specific coverage varying by model and year.