Dorman 300-406 Engine Harmonic Balancer Pulley

Overview of Dorman Engine Harmonic Balancer Pulley 300-406

The Dorman 300-406 engine harmonic balancer pulley is designed for Toyota 4Runner, Pickup, and T100 models. This pulley helps maintain engine balance and reduces vibration, contributing to smoother engine operation.

• Inside diameter: 2.44 inches
• Outside diameter: 6.1 inches
• Single V-belt groove for belt compatibility
• Four mounting holes with 0.365 inch diameter each
• Depth of 0.89 inches for proper fitment
• Regular grade type construction
• Mounting hardware and center bolt not included
• No keyway notch present

Detailed Product Description

The Dorman 300-406 harmonic balancer pulley is engineered to meet the specifications required for Toyota 4Runner, Pickup, and T100 vehicles. With an inside diameter of 2.44 inches and an outside diameter of 6.1 inches, this pulley is designed to accommodate a single V-belt groove, ensuring proper belt alignment and tension. The pulley features four mounting holes, each with a diameter of 0.365 inches, allowing secure attachment to the engine block. Its 0.89-inch depth ensures compatibility with the engine’s harmonic balancer assembly. The regular grade type construction provides reliable performance under normal operating conditions. Note that mounting hardware and center bolt are not included, so these components must be sourced separately during installation.

Common Applications and Problem Resolution

• Reduces engine vibration and harmonic imbalance
• Replaces worn or damaged harmonic balancer pulleys
• Prevents premature belt wear by maintaining proper pulley alignment
• Helps avoid engine accessory drive issues related to pulley failure
• Restores smooth engine operation in Toyota 4Runner, Pickup, and T100 models

Installation Notes and Tips

• Ensure the pulley matches the engine harmonic balancer specifications for your Toyota model
• Verify the inside and outside diameters and mounting hole dimensions before installation
• Use appropriate tools to avoid damaging the pulley or mounting holes
• Since mounting hardware and center bolt are not included, prepare compatible fasteners prior to installation
• Check belt condition and alignment after installation to ensure proper operation

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 300-406 harmonic balancer pulley undergoes quality inspections to ensure durability and reliable performance. While specific warranty details may vary, Dorman typically offers limited warranties covering defects in material and workmanship. Consult product documentation or the supplier for exact warranty terms.