Dayco PB1798N Engine Harmonic Balancer

Dayco Premium OEM Replacement Balancer PB1798N

The Dayco PB1798N engine harmonic balancer is a Premium OEM Replacement Balancer built for BMW applications that rely on precise crankshaft vibration control. It is a neutral-balance design with a cast iron outer ring and a 6-groove serpentine pulley, making it a direct-fit service part for select BMW 2.0L turbo engine platforms.

Compatible with BMW 320i, 320i xDrive, X3, X4, 228i, 228i xDrive, 328i, 328i xDrive, 328i GT xDrive, 428i, 428i xDrive, 428i Gran Coupe, 428i xDrive Gran Coupe, 528i, 528i xDrive, Z4, and X1 applications across 2012-2018 model years, the PB1798N is engineered around OE-style dimensions and pulley layout. The Dayco Premium OEM Replacement Balancer line focuses on replacement parts that match factory fitment requirements for everyday repair work.

• Engine harmonic balancer for BMW applications
• Neutral balance design with no counterweight
• Cast iron outer ring construction
• 1 integrated pulley with 6 serpentine grooves
• 6 bolt holes for mounting
• Crank bore: 35.00 mm (1.378 in.)
• Overall outside diameter: 145.00 mm (5.709 in.)
• Overall width: 35.50 mm (1.398 in.)
• No timing marks, trigger plate, hardware, or woodruff key included

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Detailed Product Description

The PB1798N is designed to mount on the crankshaft and reduce torsional vibration in the engine assembly while maintaining proper accessory drive alignment. Its neutral counterweight balance and single serpentine pulley configuration support factory-style operation on BMW models such as the 2013-2018 BMW 320i, 2012-2016 BMW 328i, and 2012-2016 BMW 528i. The cast iron outer ring adds durability for demanding engine bay conditions, while the 6-groove pulley layout matches the accessory drive setup used on the listed BMW fitments.

What This Part Helps Address

• Crankshaft vibration and harmonic imbalance
• Accessory belt tracking issues caused by worn pulley surfaces
• Noise from a deteriorated harmonic balancer
• Engine vibration felt at idle or under load
• Service replacement for a damaged OE balancer on BMW 320i, 328i, 528i, X3, X4, and related models

Installation Notes and Tips

Verify crank bore, pulley groove count, and overall diameter against the original part before installation. Because hardware, timing marks, trigger plate, and woodruff key are not included, reuse or source any required engine-specific components separately. Confirm the belt routing and accessory alignment on the BMW 228i, 328i xDrive, 428i xDrive, or other listed application before final assembly.

Quality Assurance

Dayco’s Premium OEM Replacement Balancer line is built as an OE-style service solution for factory-matched replacement needs. The PB1798N follows the listed dimensions and configuration for the specified BMW applications, including 2012-2018 BMW 320i, 328i, 528i, X1, X3, X4, and related models.