Hayden 5951 Accessory Drive Belt Idler Assembly

Hayden 5951 Idler Assembly for Accessory Drive Systems

The Hayden 5951 accessory drive belt idler assembly is a steel V-belt pulley component built for factory air and adjustable belt-drive applications. It is used on select Ford and Mercury vehicles, including Mustang, Capri, Pinto, Bobcat, Fairmont, Zephyr, Marquis, and LTD Crown Victoria applications.

Key Features

• Steel construction for durable belt-drive service
• Grey finish
• V-belt pulley style with 1 groove
• Outside diameter: 3.750 in. / 95.250 mm
• Inside diameter: 0.399 in.
• Mounting hole diameter: 0.406 in. with 1 mounting hole
• Pulley width: 0.69 in. / 17.5 mm
• Accessory Drive Belt Idler Assembly for tensioner and pulley applications
• Hayden 5951 cross-references Standard Ignition IP51 and Four Seasons 45951

Product Details

Hayden Idler Assembly 5951 is a belt-drive service part for accessory systems that use a V-belt layout. The steel pulley construction and single-groove design support proper belt routing in factory air and adjustable configurations. This part is listed for select 1973-1988 Ford and Mercury vehicles, including Ford Mustang, Mercury Capri, Ford Pinto, Mercury Bobcat, Ford Fairmont, Mercury Zephyr, Mercury Marquis, and Ford LTD Crown Victoria. If you are replacing a worn accessory drive belt idler assembly on a classic Ford or Mercury platform, Hayden 5951 provides the correct style and dimensions for the listed applications.

Common Uses

• Replacing a noisy or worn accessory drive belt idler pulley
• Restoring proper belt tracking on V-belt systems
• Addressing belt squeal caused by pulley wear or misalignment
• Repairing factory air accessory drive setups on select Ford and Mercury models
• Servicing adjustable belt-drive assemblies on older vehicles

Installation Notes and Tips

Verify belt type, pulley width, groove count, and mounting dimensions before installation. This Hayden 5951 idler assembly is listed for specific Ford and Mercury applications, so confirm the vehicle year, engine accessory layout, and factory air or adjustable configuration against the fitment data. Inspect the belt condition and surrounding accessory drive components during service to help ensure proper alignment after replacement.

Quality Assurance

Hayden is a recognized name in belt-drive and cooling system components, and this idler assembly is built with steel construction for service in accessory drive applications. This part cross-references Standard Ignition IP51 and Four Seasons 45951 for the same application.

Fitment

• Fits 1987-1988 Ford LTD Crown Victoria, N/A; Dealer Air; Idler Assembly
• Fits 1986 Ford Mustang, N/A; Compatible with vehicles equipped with Factory Air.; Idler Assembly
• Fits 1979-1984 Ford Mustang, N/A; Compatible with vehicles equipped with Factory Air.; Idler Assembly
• Fits 1983-1986 Mercury Capri, N/A; Compatible with vehicles equipped with Factory Air.; Idler Assembly
• Fits 1979 Mercury Capri, N/A; Compatible with vehicles equipped with Factory Air.; Idler Assembly
• Fits 1983-1986 Mercury Marquis, N/A; Compatible with vehicles equipped with Factory Air.; Idler Assembly
• Fits 1978-1983 Ford Fairmont, N/A; Compatible with vehicles equipped with Factory Air.; Idler Assembly
• Fits 1978-1983 Mercury Zephyr, N/A; Compatible with vehicles equipped with Factory Air.; Idler Assembly
• Fits 1980-1982 Mercury Capri, N/A; Idler Assembly
• Fits 1980 Ford Pinto, N/A; Adjustable; Idler Assembly
• Fits 1980 Mercury Bobcat, N/A; Compatible with vehicles equipped with Factory Air.; Idler Assembly
• Fits 1978-1979 Ford Pinto, N/A; Idler Assembly
• Fits 1973 Ford Pinto, N/A; Idler Assembly
• Fits 1975-1978 Mercury Bobcat, N/A; Adjustable; Idler Assembly
• Fits 1976-1977 Mercury Capri, N/A; w/ Factory Air; Adjustable; Idler Assembly