Dorman 917-257 Engine Variable Valve Timing (VVT) Sprocket - Intake

Overview of Dorman Engine Variable Valve Timing Sprocket

The Dorman 917-257 Engine Variable Valve Timing (VVT) Sprocket is designed for reliable performance in select Chevrolet, Pontiac, and Toyota vehicles. Crafted from durable steel with a silver zinc-plated finish, this standard replacement cam phaser ensures consistent operation of the variable valve timing system.

• Constructed from high-strength steel for durability
• Silver zinc-plated surface for corrosion resistance
• Standard replacement grade for dependable function
• Overall height of 1.5 inches and length of 4 inches
• Includes cam phaser and mounting bolt in package

Detailed Product Description

This Dorman Engine Variable Valve Timing Sprocket (part number 917-257) is engineered to meet OEM specifications for vehicles such as the Chevrolet Prizm, Pontiac Vibe, and Toyota Celica, Corolla, Matrix, and MR2 Spyder. The steel construction provides the necessary strength to withstand engine stresses, while the silver zinc plating offers protection against rust and wear. With an overall height of 1.5 inches and length of 4 inches, this cam phaser fits precisely within the valve train assembly to maintain optimal timing control.

Compatible Vehicles and Applications

Compatible with the following makes and models:

• Chevrolet Prizm
• Pontiac Vibe
• Toyota Celica
• Toyota Corolla
• Toyota Matrix
• Toyota MR2 Spyder

Common Issues Addressed by This VVT Sprocket

• Irregular engine timing causing rough idling or poor acceleration
• Check engine light triggered by variable valve timing faults
• Reduced fuel efficiency due to improper camshaft phasing
• Engine performance loss related to worn or damaged cam phaser
• Noise or rattling from faulty valve timing components

Installation Notes and Tips

Installation of the Dorman 917-257 VVT sprocket requires proper alignment and torque specifications to ensure correct valve timing. It is recommended to follow the vehicle manufacturer’s service manual for detailed procedures. The included bolt should be used to secure the cam phaser firmly. Professional installation is advised for those unfamiliar with engine timing components.

Quality Assurance and Warranty

Dorman provides this Engine Variable Valve Timing Sprocket as a standard replacement part manufactured to meet industry standards. The steel material and corrosion-resistant plating contribute to long service life. While specific warranty details may vary, Dorman typically offers limited warranties covering defects in material and workmanship. Refer to Dorman’s official documentation for exact warranty terms.