Dayco PB1647N Engine Harmonic Balancer

Dayco PB1647N Harmonic Balancer

The Dayco PB1647N is a premium OEM replacement harmonic balancer for select Chevrolet and GMC trucks and vans. It is built with a hub-weighted counterweight balance, a cast iron outer ring, and a single integrated serpentine pulley to support smooth crankshaft operation in demanding engine applications.

Key Features

• Part number: PB1647N
• Premium OEM Replacement Balancer from Dayco
• Hub weighted counterweight balance
• Cast iron outer ring construction
• One integrated pulley with 6 grooves
• Serpentine pulley design
• Overall outside diameter: 7.835 in. (199.00 mm)
• Overall width: 2.345 in. (59.55 mm)
• Crank bore: 1.930 in. (49.01 mm)
• No timing marks, trigger plate, woodruff key, or installation hardware included

Detailed Description

Dayco PB1647N is an engine harmonic balancer engineered as a premium OEM replacement balancer for 2011-2016 Chevrolet Express 2500, Chevrolet Express 3500, Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500 HD, GMC Savana 2500, GMC Savana 3500, GMC Sierra 2500 HD, and GMC Sierra 3500 HD. The hub-weighted design and cast iron outer ring help maintain rotational stability, while the 6-groove serpentine pulley supports accessory drive operation. If you are replacing a worn harmonic balancer on a Chevrolet Silverado 2500 HD or GMC Sierra 3500 HD, PB1647N provides the correct fitment details for these applications.

Dayco’s Premium OEM Replacement Balancer line focuses on direct-fit service parts for engine repair work where OE-style dimensions matter. This part number, PB1647N, matches the listed crank bore, width, and pulley configuration for the specified Chevrolet and GMC applications.

What This Part Helps Address

• Crankshaft vibration from a worn or separated balancer
• Belt drive noise caused by pulley wear or imbalance
• Accessory drive instability on serpentine-equipped engines
• Engine vibration felt at idle or under load
• Replacement needs after rubber isolation deterioration

Installation Notes

Verify crank bore, overall diameter, width, and pulley groove count before installation. This harmonic balancer does not include hardware, installation instructions, a crank trigger/exciter plate, timing marks, or a woodruff key. Confirm engine-specific fitment for your Chevrolet Express 2500, Chevrolet Silverado 3500 HD, or GMC Savana 3500 before assembly.

Quality Assurance

Dayco’s Premium OEM Replacement Balancer line is built for direct replacement service in OE-matched applications. PB1647N is specified with exact dimensional data to support accurate fitment on the listed Chevrolet and GMC vehicles.