Hayden 5916 Accessory Drive Belt Idler Pulley

Hayden 5916 Accessory Drive Belt Idler Pulley

The Hayden 5916 is a steel accessory drive belt idler pulley built for serpentine belt systems. It uses a smooth back idler design with a black finish and meets or exceeds OEM requirements for direct replacement service.

Compatible with select INFINITI and Nissan applications, including 2003-2008 INFINITI FX35, 2006-2008 INFINITI M35, 2003-2007 INFINITI G35, 2003-2006 Nissan 350Z, 2001-2004 Nissan Pathfinder, and 2002-2003 INFINITI QX4. This Hayden pulley is identified by part number 5916 and cross-references Four Seasons 45916 for the same application.

Key Features

• Steel construction for accessory drive belt service
• Smooth back idler pulley design for serpentine belt routing
• Black finish
• 1 mounting hole design
• Outside diameter: 3.3125 in. (84.138 mm)
• Inside diameter: 0.46875 in. / bore diameter: 0.47 in. (11.906 mm)
• Pulley width: 1 in. (25.4 mm)
• Belt width: 0.9375 in. (22.225 mm)
• Meets or exceeds OEM specifications

Product Details

Hayden Pulley line components are built for accessory drive belt system service, with this idler pulley engineered as a back idler for serpentine belt applications. The steel pulley body and smooth groove-free surface support proper belt tracking in systems that rely on a back-side belt contact point. Use Hayden 5916 when replacing a worn or noisy idler pulley on select INFINITI FX35, G35, M35, QX4, and Nissan 350Z or Pathfinder models.

Common Problems This Part Can Address

• Squealing or chirping from a worn idler pulley
• Belt misalignment caused by pulley wear
• Rough pulley rotation from bearing deterioration
• Serpentine belt noise during engine operation
• Visible pulley surface wear or damage

Installation Notes and Tips

Verify pulley diameter, bore size, belt width, and mounting style before installation. Mounting hardware is not included, so reuse or source the correct hardware as needed. Inspect the serpentine belt, tensioner, and adjacent pulleys during service to confirm the full accessory drive system is in good condition. Confirm vehicle application by year, make, and model before ordering.

Quality Assurance

This Hayden idler pulley is manufactured to meet or exceed OEM requirements for the listed applications. It is a direct replacement part for routine accessory drive belt system repair on compatible INFINITI and Nissan vehicles.