Dayco 89840 Accessory Drive Belt Idler Pulley - Grooved Pulley

Durable Accessory Drive Belt Idler Pulley for Toyota and Scion

The Dayco 89840 accessory drive belt idler pulley is engineered to maintain optimal serpentine belt tension in select Toyota and Scion models. Designed with a polymer construction and precise bearing specifications, this pulley supports reliable belt operation and longevity.

• Constructed from durable polymer material for corrosion resistance
• Features 6 grooves compatible with serpentine belts
• Bearing inner diameter of 17 mm and bearing width of 12 mm for smooth rotation
• Supports a maximum belt width of 6 ribs
• Includes a single bearing to reduce friction and wear

Technical Details and Specifications

The Dayco 89840 idler pulley is specifically designed for accessory drive belt systems requiring a 6-groove serpentine belt. Its polymer body offers resistance to environmental factors, while the bearing dimensions (17 mm inner diameter and 12 mm width) ensure consistent performance under engine load. The pulley accommodates belts up to 6 ribs wide, making it suitable for the accessory drive systems found in the Toyota 86, Scion FR-S, and Toyota GR86 models. The single bearing design helps maintain belt alignment and tension, reducing the risk of premature belt wear or failure.

Compatible Vehicles and Applications

This accessory drive belt idler pulley is compatible with the following vehicles:

• Toyota 86
• Scion FR-S
• Toyota GR86

It is intended for use in the accessory drive belt system to maintain proper belt tension and routing, which is critical for the operation of engine accessories such as the alternator, power steering pump, and air conditioning compressor.

Common Issues Addressed by the Dayco 89840 Pulley

• Eliminates belt slippage caused by worn or damaged pulleys
• Prevents uneven belt wear due to misalignment
• Reduces noise from failing idler pulleys
• Maintains proper belt tension to avoid accessory drive failure
• Improves overall accessory drive system reliability

Installation Notes and Tips

When installing the Dayco 89840 idler pulley, ensure the serpentine belt is properly routed according to the vehicle’s service manual. Inspect the belt for wear and replace if necessary. Use appropriate tools to remove the old pulley and torque the new pulley to manufacturer specifications. Regular inspection of the pulley and belt system is recommended to maintain optimal performance.

Quality Assurance and Warranty

Dayco manufactures the 89840 idler pulley to meet OEM standards for fit and function. The polymer material and bearing components are selected for durability and resistance to engine compartment conditions. While specific warranty details are not provided, Dayco products typically come with a limited warranty against defects in materials and workmanship. Refer to Dayco’s official documentation for exact warranty terms.