Dayco PBO81190SC10 Engine Harmonic Balancer

Overview of Dayco SC Performance 8 Rib 10% Overdrive Harmonic Balancer

The Dayco SC Performance 8 Rib 10% Overdrive Engine Harmonic Balancer (Part Number PBO81190SC10) is engineered for select GM and related vehicles requiring precise crankshaft vibration dampening. Designed with durability and performance in mind, this harmonic balancer supports engine longevity and smooth operation in models like the Chevrolet Silverado and GMC Sierra.

• Compatible with Buick, Cadillac, Chevrolet, GMC, Hummer, Isuzu, and Saab vehicles
• Features 9 bolt holes for secure mounting
• Neutral counterweight balance design without additional counterweights
• Two integrated serpentine pulleys with 4 and 8 grooves respectively
• Steel outer ring for enhanced durability
• Includes installation instructions for proper fitment
• Timing marks included for accurate engine timing

Detailed Product Features and Specifications

This harmonic balancer has a crank bore diameter of 1.481 inches (37.60 mm) and an overall outside diameter of 8.426 inches (214.00 mm). The nose outside diameter measures 2.126 inches (54.00 mm), while the overall width is 4.626 inches (117.50 mm). The balancer integrates two serpentine pulleys: the first pulley has 4 grooves with a diameter of 7.528 inches (191.20 mm), and the second pulley has 8 grooves with a diameter of 8.268 inches (210.00 mm). The steel outer ring and neutral counterweight balance ensure reliable vibration dampening without added imbalance. This part does not include hardware or a Woodruff key but comes with installation instructions to assist with proper setup.

About the SC Performance 8 Rib 10% Overdrive Product Line

The SC Performance 8 Rib 10% Overdrive line by Dayco is designed to provide enhanced accessory drive performance by increasing pulley diameter by 10%, which can improve belt tension and accessory operation. This product line is tailored for applications requiring an 8-rib serpentine belt configuration, making it suitable for a range of GM and related vehicles. The design supports reliable engine harmonic balancing while accommodating performance-driven pulley ratios.

Compatible Vehicles and Common Applications

• Chevrolet Silverado 1500, 2500, 3500 (including Classic and HD variants)
• GMC Sierra 1500, 2500, 3500 (including Classic and HD variants)
• Cadillac Escalade, Escalade ESV, Escalade EXT
• Buick Rainier, Saab 9-7x, Isuzu Ascender
• Hummer H2, H3, H3T
• Chevrolet Avalanche, Suburban, Tahoe, Trailblazer

Common Issues Addressed by This Harmonic Balancer

• Engine vibration and crankshaft harmonics causing noise or wear
• Worn or damaged balancer leading to belt misalignment
• Failure of integrated pulleys affecting accessory drive belts
• Incorrect pulley ratios impacting accessory performance
• Timing mark visibility for accurate engine timing adjustments

Installation Notes and Tips

• Ensure the crank bore and bolt hole pattern match the engine specifications
• Use the included installation instructions for proper torque and alignment
• Verify timing marks align correctly during installation
• Check belt routing and tension after installation to prevent premature wear
• Hardware is not included; reuse existing bolts or source appropriate replacements

Quality Assurance and Warranty

Dayco harmonic balancers are manufactured to meet OEM standards for fit, form, and function. The steel outer ring construction and neutral counterweight design contribute to long service life and reliable engine performance. Installation instructions are provided to support correct application. Warranty details should be confirmed with the distributor or manufacturer, as they may vary by region and application.