Hayden 5964 Accessory Drive Belt Idler Assembly

Hayden 5964 Idler Assembly Overview

Hayden 5964 is an accessory drive belt idler assembly built with a steel body and a smooth back-idler pulley profile. It is specified for vehicles that use a 1.000 in. belt width and a 3.3125 in. outside diameter pulley, making it a direct-fit service part for select Ford and Mercury applications.

This Hayden Idler Assembly line focuses on belt routing and pulley support for accessory drive systems. For buyers searching for a Ford Thunderbird idler assembly or Mercury Cougar accessory drive belt idler, part number 5964 provides the dimensional and mounting details needed for a proper replacement.

Key Features

• Brand: Hayden
• Part number: 5964
• Accessory drive belt idler assembly for belt system service
• Steel construction for durable pulley support
• Smooth groove, back-idler belt type
• Outside diameter: 3.3125 in. / 84.138 mm
• Pulley width: 1.130 in. / 29 mm
• Designed for 1.000 in. / 25.400 mm belt width
• Single mounting hole design with 0.48 in. mounting hole diameter

Detailed Description

Hayden 5964 is an idler assembly for the accessory drive belt system, engineered with a steel pulley body and smooth surface to guide the belt along the correct path. The brass color finish and compact 6.63 in. length reflect the assembly’s service-focused design, while the 0.67 in. inside diameter and single mounting hole layout support a precise installation on listed Ford and Mercury vehicles. This part cross-references Four Seasons 45964 and Dayco 89031 for the same application.

Fits 1989 Ford Thunderbird, N/A; Fits 1987-1988 Ford Cougar, N/A; Fits 1985-1988 Ford Thunderbird, N/A; Fits 1987-1988 Mercury Cougar, N/A; Fits 1985-1986 Ford Cougar, N/A; Fits 1986 Ford LTD, N/A; Fits 1985-1986 Ford Mustang, N/A; Fits 1986 Mercury Capri, N/A; Fits 1985-1986 Mercury Cougar, N/A; Fits 1984-1986 Mercury Marquis, N/A; Fits 1985 Mercury Capri, N/A; Fits 1983-1984 Ford Mustang, N/A; Fits 1983-1984 Ford Thunderbird, N/A; Fits 1983-1984 Mercury Capri, N/A; Fits 1983-1984 Mercury Cougar, N/A; Fits 1983 Mercury Marquis, N/A.

What It Helps Address

• Worn or noisy accessory drive belt idler pulley
• Belt tracking issues in the accessory drive system
• Uneven pulley rotation caused by age or wear
• Service replacement for factory air-equipped Ford and Mercury belt routing applications
• Restoration of proper belt path on select Thunderbird, Cougar, Mustang, Capri, LTD, and Marquis models

Installation Notes and Tips

Verify pulley diameter, belt width, and mounting-hole dimensions before installation. Confirm vehicle application by year, make, model, and factory air configuration where noted, especially on 1983-1989 Ford Thunderbird, Ford Cougar, and Mercury Cougar applications. Inspect the belt and adjacent accessory drive components during service so the new idler assembly can operate on a clean, aligned belt path.

Quality Assurance

Hayden is a recognized name in belt drive and cooling system components, and this idler assembly is built to match the listed application dimensions and interchange references for accurate replacement service.