Dorman 917-255 Engine Variable Valve Timing (VVT) Sprocket

Overview of Dorman Engine Variable Valve Timing Sprocket

The Dorman 917-255 Engine Variable Valve Timing (VVT) Sprocket is designed for reliable performance in select Buick, Chevrolet, GMC, Isuzu, and Oldsmobile vehicles. This silver zinc-plated steel sprocket offers a standard replacement option engineered to meet OEM specifications.

• Constructed from durable steel with silver zinc plating for corrosion resistance
• Standard replacement grade ensuring consistent engine timing performance
• Overall height of 5.8 inches and length of 2.73 inches for precise fitment
• Includes M10 x 1.5 cam shaft bolt for secure installation
• Compatible with multiple models including Buick Rainier, Chevrolet Trailblazer, GMC Envoy, and more

Detailed Product Description

The Dorman 917-255 VVT sprocket is manufactured from high-quality steel with a silver zinc-plated finish to resist wear and corrosion over time. Its dimensions—5.8 inches in height and 2.73 inches in length—are engineered to match the exact specifications required for proper variable valve timing operation. This part is a standard replacement grade component, providing a reliable solution for maintaining engine timing accuracy in vehicles equipped with variable valve timing systems.

Included with the sprocket is an M10 x 1.5 cam shaft bolt, ensuring a secure and proper fit during installation. This VVT sprocket is compatible with a range of vehicles, including Buick Ascender and Rainier, Chevrolet Bravada, Trailblazer, Trailblazer EXT, GMC Envoy, Envoy XL, Envoy XUV, and Isuzu models, as well as Oldsmobile vehicles that utilize this part number.

Common Applications and Issues Addressed

• Restores proper variable valve timing function in affected engines
• Resolves engine performance issues related to worn or damaged VVT sprockets
• Eliminates timing chain noise caused by faulty sprocket components
• Prevents engine misfires and rough idling linked to timing irregularities
• Supports overall engine efficiency and emissions control

Installation Notes and Tips

• Ensure engine is cool before beginning installation to avoid injury
• Use the included M10 x 1.5 cam shaft bolt to secure the sprocket properly
• Verify alignment marks on the sprocket and timing chain for accurate timing setup
• Consult vehicle-specific service manual for torque specifications and detailed procedures
• Inspect related timing components for wear during replacement

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 917-255 VVT sprocket undergoes rigorous quality control to ensure durability and reliable performance. While specific warranty details may vary, Dorman typically offers limited warranties covering defects in material and workmanship. Refer to official Dorman documentation for exact warranty terms.