Dorman 917-252 Engine Variable Valve Timing (VVT) Sprocket - Intake

Overview of Dorman Engine Variable Valve Timing Sprocket 917-252

The Dorman 917-252 Engine Variable Valve Timing (VVT) Sprocket is designed as a standard replacement part for select Lexus and Toyota models. Constructed from durable steel with a silver zinc-plated finish, this sprocket ensures reliable performance in your vehicle's valve train system.

• Material: High-strength steel for durability
• Color: Silver with zinc plating to resist corrosion
• Overall Height: 2.34 inches
• Diameter: 4.594 inches
• Package includes cam phaser and bolt for installation

Detailed Product Description

This engine variable valve timing sprocket by Dorman is engineered to meet the specifications required for proper camshaft phasing in compatible Lexus and Toyota vehicles. The steel construction provides the necessary strength to withstand engine operating conditions, while the silver zinc plating offers protection against rust and wear. With an overall height of 2.34 inches and a diameter of 4.594 inches, the sprocket fits precisely within the valve train assembly to maintain optimal engine timing.

The included cam phaser and bolt simplify the replacement process, ensuring that the part is ready for installation upon delivery. This part is a standard replacement, designed to restore the original function of the variable valve timing system without modification.

Compatible Vehicles and Common Applications

The Dorman 917-252 VVT sprocket is compatible with a range of Lexus and Toyota models, including:

• Lexus ES350, RX350, RX450h
• Toyota Avalon, Camry, Highlander, RAV4, Sienna, Venza

This part is typically used to address issues related to variable valve timing malfunctions, which can affect engine performance and efficiency.

Common Issues Addressed by This VVT Sprocket

• Irregular engine timing causing rough idling or stalling
• Check engine light triggered by VVT system faults
• Reduced fuel efficiency due to improper valve timing
• Engine hesitation or loss of power during acceleration
• Noise or vibration from the valve train area

Installation Notes and Tips

• Ensure engine is cool before beginning installation
• Use the included bolt and cam phaser for proper fitment
• Follow vehicle-specific service manual instructions for torque specifications
• Verify timing alignment after installation to prevent engine damage
• Inspect related components such as timing chain and tensioners during replacement

Quality Assurance and Warranty Information

Dorman manufactures this VVT sprocket to meet industry standards for replacement engine components. The steel material and corrosion-resistant finish contribute to the part's longevity. While specific warranty details may vary, Dorman typically offers limited warranties covering defects in material and workmanship. Refer to the product packaging or Dorman's official documentation for exact warranty terms.