Dayco 89574 Accessory Drive Belt Idler Pulley

Overview of Dayco Accessory Drive Belt Idler Pulley 89574

The Dayco 89574 accessory drive belt idler pulley is designed for reliable performance in Mercedes-Benz vehicles, specifically the C250 and SLK250 models. Engineered with a polymer material and a serpentine belt compatibility, this idler pulley supports smooth belt operation and helps maintain proper tension in the accessory drive system.

• Constructed from durable polymer material for long-lasting use
• Designed with 6 grooves to accommodate serpentine belts
• Bearing inner diameter of 17 mm and bearing width of 12 mm for precise fitment
• Supports a maximum belt width of 6 ribs
• Single bearing design for efficient rotation and reduced friction

Technical Details and Specifications

The Dayco 89574 idler pulley features a 62 mm outer diameter and a 25.7 mm pulley width, optimized for serpentine belt systems in Mercedes-Benz C250 and SLK250 models. Its polymer construction offers resistance to wear and heat, contributing to consistent belt alignment and tension. The pulley includes one bearing with a 17 mm inner diameter and 12 mm width, ensuring smooth rotation and durability under engine operating conditions. The 6-groove design matches the rib count of compatible serpentine belts, supporting a maximum belt width of 6 ribs.

Compatible Vehicles and Applications

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

• Mercedes-Benz C250
• Mercedes-Benz SLK250

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 Dayco 89574

• Eliminates belt slippage caused by worn or damaged pulleys
• Prevents premature belt wear due to misalignment
• Reduces noise from accessory drive belt system
• Maintains consistent belt tension for optimal accessory performance
• Helps avoid engine accessory failure related to belt drive issues

Installation Notes and Tips

When installing the Dayco 89574 idler pulley, ensure the serpentine belt is properly routed according to the vehicle’s belt diagram. Verify that the bearing rotates smoothly without resistance or noise before installation. Use appropriate tools to avoid damaging the polymer pulley surface. It is recommended to inspect the serpentine belt and other drive components during installation to ensure overall system integrity.

Quality Assurance and Warranty

Dayco manufactures the 89574 idler pulley to meet OEM specifications for Mercedes-Benz vehicles. The polymer material and bearing components are selected for durability and consistent performance. While specific warranty details are not provided, Dayco products typically adhere to industry standards for quality and reliability.