Hayden 5985 Accessory Drive Belt Idler Pulley - Alternator (Right) or Right

Hayden 5985 Accessory Drive Belt Idler Pulley

The Hayden 5985 is a serpentine accessory drive belt idler pulley built for select BMW applications. It uses a smooth, black plastic pulley design with a 3.1875-inch outside diameter and 1.125-inch belt width to support proper belt routing in the accessory drive system.

Compatible With BMW 840Ci, 530i, 740i, and 740iL applications listed below, this pulley is a direct-fit replacement for the specified right-side and alternator-side positions. Hayden Pulley 5985 meets or exceeds OEM requirements and is cross-referenced to common aftermarket part numbers for the same application.

Key Features

• Accessory drive belt idler pulley for serpentine belt systems
• Black plastic construction
• Smooth groove design for belt tracking
• 3.1875 in. outside diameter
• 1.125 in. pulley width
• 0.375 in. bore diameter
• Single mounting hole design
• Meets or exceeds OEM specifications

Detailed Description

Hayden Pulley 5985 is an idler/tensioner pulley designed for accessory drive belt service on select BMW models. The pulley type is a back idler style, with a smooth face intended for serpentine belt routing rather than a grooved accessory pulley. Its 28.6 mm width, 80.963 mm outside diameter, and 9.525 mm bore dimensions support accurate replacement in the specified positions. This part cross-references Gates 38046 and Four Seasons 45985 for the same application.

Fits 1994-1997 BMW 840Ci, Right, w/o Bracket; Pulley. Fits 1994-1995 BMW 530i, Right, Pulley. Fits 1993-1995 BMW 740i, Alternator (Right), Pulley. Fits 1993-1995 BMW 740iL, Alternator (Right), Pulley. Hayden 5985 is a practical replacement choice when servicing BMW 840Ci, BMW 530i, or BMW 740i/740iL accessory drive belt hardware.

Common Uses

• Replacing a worn or noisy serpentine belt idler pulley
• Restoring proper belt alignment in the accessory drive system
• Addressing belt squeal caused by pulley wear or surface damage
• Correcting belt tracking issues at the right-side or alternator-side position
• Servicing BMW accessory drive components during belt maintenance

Installation Notes and Tips

Verify pulley diameter, bore size, belt width, and mounting-hole configuration before installation. Mounting hardware is not included, so reuse or source the correct hardware as needed. Inspect the serpentine belt, tensioner, and adjacent pulleys for wear at the same time to help avoid repeat service.

Quality Assurance

Hayden 5985 is listed as meeting or exceeding OEM requirements for the specified applications. Confirm vehicle fitment by year, model, and position before ordering.