Dorman 419-678 Accessory Drive Belt Idler Pulley - Air Conditioning

Overview of Dorman Accessory Drive Belt Idler Pulley 419-678

The Dorman 419-678 accessory drive belt idler pulley is designed specifically for select Ford Escape, Mazda, and Mercury Mariner models. Constructed from durable black plastic, this idler pulley supports the serpentine belt system by maintaining proper tension and alignment.

• Material: High-quality black plastic for durability
• Inside Diameter: 17 mm
• Outside Diameter: 68.5 mm
• Groove Quantity: 6 grooves to accommodate serpentine belts
• Width: Approximately 25 to 25.5 mm
• Single mounting hole for secure installation
• Includes one pulley bearing with 12 mm width
• Designed for specific fitment on Ford Escape, Mazda, and Mercury Mariner
• Standard grade type suitable for everyday driving conditions

Detailed Product Description

The Dorman 419-678 accessory drive belt idler pulley is engineered to maintain optimal belt tension and routing in the accessory drive system. Its plastic construction balances strength and weight, while the six-groove design ensures compatibility with serpentine belts commonly used in Ford Escape, Mazda, and Mercury Mariner vehicles. The pulley’s 68.5 mm outside diameter and 17 mm inside diameter provide precise fitment, reducing belt slippage and wear. This idler pulley includes a single bearing with a 12 mm width, contributing to smooth rotation and extended service life. The part is designed for specific vehicle applications, ensuring proper alignment and performance without the need for additional mounting hardware.

Common Applications and Issues Addressed

• Restores proper serpentine belt tension and alignment
• Eliminates belt squealing caused by worn or damaged pulleys
• Prevents premature belt wear and potential accessory drive failure
• Replaces noisy or seized idler pulleys in Ford Escape, Mazda, and Mercury Mariner
• Supports smooth operation of alternator, power steering, and air conditioning belts

Installation Notes and Tips

• Verify compatibility with your specific Ford Escape, Mazda, or Mercury Mariner model before installation
• Inspect the serpentine belt for wear and replace if necessary during pulley installation
• Use appropriate tools to remove the old pulley and install the new one securely
• Check belt tension and alignment after installation to ensure proper operation
• Mounting hardware is not included; reuse existing hardware or source separately if needed

Quality Assurance and Warranty

Dorman manufactures the 419-678 accessory drive belt idler pulley to meet standard grade specifications, providing reliable performance for everyday driving conditions. While mounting hardware is not included, the pulley is engineered for specific fitment on Ford Escape, Mazda, and Mercury Mariner vehicles to ensure proper function. Please consult Dorman’s warranty policy for coverage details related to this part.