Dayco PB1721N Engine Harmonic Balancer

Dayco Premium OEM Replacement Balancer PB1721N

The Dayco PB1721N engine harmonic balancer is a premium OEM replacement balancer built for a wide range of Audi and Volkswagen applications. It is engineered with a neutral balance, a steel outer ring, and integrated serpentine pulley construction to support smooth crankshaft operation and accurate accessory drive performance.

For drivers searching for an Audi A4 harmonic balancer, Volkswagen GTI harmonic balancer, or a direct-fit replacement for other EA888-era applications, this part number PB1721N offers the fitment and dimensional details needed for a proper service replacement.

Key Features

• Brand: Dayco Premium OEM Replacement Balancer
• Part number: PB1721N
• Engine harmonic balancer with neutral, no-counterweight balance
• Steel outer ring for durable crankshaft damping support
• Integrated serpentine pulley with 6 grooves
• Timing marks included for service alignment
• 4-bolt hole design
• No crank trigger/exciter plate, hardware, or woodruff key included
• Overall outside diameter: 5.622 in. (142.78 mm)
• Overall width: 1.418 in. (36.00 mm)

Product Details

The Dayco Premium OEM Replacement Balancer line focuses on direct replacement fitment for vehicles that require OE-style crankshaft vibration control and accessory drive alignment. PB1721N is built with a 0.648 in. crank bore, a 1.772 in. nose outside diameter, and a ring width of 1.142 in. (29.00 mm), helping maintain the dimensional consistency expected in factory-style service parts. The integrated 6-groove serpentine pulley supports the accessory belt system, while the timing marks assist with engine service and setup.

This part is listed for many Audi and Volkswagen models, including Audi A3, A4, A5, A6, Q3, Q5, Q7, S3, TT Quattro, and Volkswagen GTI, Jetta, Passat, Tiguan, Atlas, and Golf variants. If you are replacing a worn Audi Q5 harmonic balancer or a Volkswagen Tiguan crankshaft balancer, PB1721N is a fitment-specific option to verify against your engine code and original part dimensions.

What This Part Helps Address

• Crankshaft vibration from a worn or deteriorated harmonic balancer
• Belt tracking issues related to pulley wear or imbalance
• Timing mark visibility problems during engine service
• Accessory drive noise caused by a damaged balancer pulley
• Fitment concerns when replacing an OE-style balancer on Audi and Volkswagen engines

Installation Notes and Tips

Verify crank bore, nose diameter, bolt-hole quantity, pulley groove count, and overall width against the original balancer before installation. Confirm the vehicle application and engine configuration for your Audi A4, Audi Q5, Volkswagen GTI, or other listed model, since fitment can vary by engine family and production date. Hardware is not included, and installation instructions are not included, so use the correct service procedure and torque specifications from the vehicle manufacturer.

Quality Assurance

Dayco manufactures this Premium OEM Replacement Balancer as a service part for direct-fit engine repair applications. PB1721N is built to match the listed OE-style dimensions and features, including timing marks and a steel outer ring, for consistent replacement performance.