Hayden 5066 Accessory Drive Belt Idler Pulley - Right or Water Pump

Hayden 5066 Idler Pulley Overview

The Hayden 5066 accessory drive belt idler pulley is a direct-fit replacement for serpentine belt systems that need a stable, OE-style pulley surface. Built with a black plastic body and a 6-groove profile, it supports proper belt tracking in applications such as Ford Mustang, Jeep Cherokee, and Lincoln LS service repairs.

Hayden Pulley 5066 is specified as an idler/tensioner pulley with a 3.500-inch outside diameter, 1-inch pulley width, and a 17 mm inside diameter. It meets or exceeds OEM requirements and is designed for vehicles using a 0.750-inch serpentine belt width.

Key Features

• Accessory drive belt idler pulley for serpentine belt systems
• Black plastic construction for OE-style replacement fit
• 6-groove design for serpentine belt routing
• 3.500-inch outside diameter and 1-inch pulley width
• 17 mm inside diameter with a single mount hole
• Meets or exceeds OEM specifications
• Mounting hardware not included

Detailed Product Description

This Hayden 5066 pulley is used in accessory drive systems where the belt must maintain alignment and tension across engine-driven accessories. The grooved pulley design helps the serpentine belt ride correctly on the pulley face, while the plastic construction keeps the replacement aligned with common OE service part designs. This part cross-references Gates 38019 for the same application.

Fits 2000-2005 Lincoln LS, pulley; fits 1996-2001 Jeep Cherokee, grooved pulley; fits 1986-1994 Jeep Cherokee, grooved pulley; fits 1991-1993 Ford Mustang, water pump; fits 1987-1989 Ford Mustang, right; fits 1987-1988 Ford Thunderbird, right. Additional coverage includes Chevrolet C2500, C2500 Suburban, C3500, K2500, K2500 Suburban, K3500 and GMC C2500, C2500 Suburban, C3500, K2500, K2500 Suburban, K3500 applications with air conditioning, plus Chevrolet G30 and GMC G3500 applications without air conditioning.

Common Repair Uses

• Replacing a worn or noisy idler pulley
• Correcting belt squeal caused by pulley wear
• Restoring proper serpentine belt tracking
• Addressing belt misalignment in accessory drive systems
• Repairing a damaged pulley surface or bearing-related noise

Installation Notes and Tips

Verify pulley diameter, groove count, belt width, and mounting style before installation. This Hayden pulley uses a single mount hole and does not include mounting hardware. Confirm vehicle-specific notes, including air conditioning and position requirements, before ordering. For best results, inspect the serpentine belt and adjacent tensioner components during service.

Quality Assurance

Hayden Pulley 5066 is built to meet or exceed OEM specifications for accessory drive belt service. It is listed with confirmed interchange coverage for Continental 49016 and Four Seasons 45066, supporting parts lookup and replacement matching.