Hayden 5942 Accessory Drive Belt Idler Assembly

Hayden 5942 Idler Assembly Overview

The Hayden 5942 idler assembly is a steel accessory drive belt component built for smooth belt routing in factory serpentine systems. It is a back idler style pulley with a smooth groove, 3.3125 in. outside diameter, and 1.25 in. pulley width for applications that require stable belt tracking.

Use this Hayden Idler Assembly 5942 when servicing accessory drive belt systems on select Ford, Lincoln, and Mercury vehicles, including Mercury Grand Marquis, Ford LTD Crown Victoria, and Lincoln Mark VII applications. The grey steel construction and single-mount design support direct replacement needs in belt drive service.

Key Features

• Brand: Hayden Idler Assembly
• Part number: 5942
• Steel construction with grey finish
• Smooth-groove back idler design
• Outside diameter: 3.3125 in. (84.138 mm)
• Pulley width: 1.25 in. (26.9 mm)
• Belt width: 1.0625 in. (25.400 mm)
• Single mounting hole design
• Accessory drive belt idler assembly for tensioner and pulley service

Detailed Description

Hayden 5942 is an accessory drive belt idler assembly engineered for belt routing in serpentine drive systems. Its smooth, back-idler profile helps maintain proper belt path where the belt rides on the back side of the pulley, while the steel body provides a durable service replacement for worn or noisy idler hardware. This part number 5942 is listed across multiple interchange references, including Four Seasons 45942 and Standard Ignition IP42, for the same application family.

Fits 1987-1991 Mercury Colony Park, N/A. Fits 1990-1991 Mercury Grand Marquis, N/A, w/ Bracket. Fits 1986-1989 Mercury Grand Marquis, N/A. Fits 1987-1988 Ford LTD Crown Victoria, N/A, Compatible with vehicles equipped with Factory Air. Fits 1986 Ford LTD, N/A, Serpentine Belt. Fits 1983-1986 Mercury Grand Marquis, N/A, Compatible with vehicles equipped with Factory Air. Fits 1985 Ford LTD, N/A. Fits 1985 Lincoln Mark VII, N/A, w/ Fixed Mounting Stud. Fits 1984 Lincoln Mark VII, N/A. Fits 1980-1983 Lincoln Mark VI, N/A. Fits 1982-1983 Lincoln Town Car, N/A. Fits 1980-1982 Mercury Marquis, N/A, Fixed. Fits 1980-1981 Mercury Grand Marquis, N/A, Fixed. Fits 1980 Lincoln Continental, N/A.

Common Problems This Part Can Address

• Accessory belt squeal caused by a worn idler pulley
• Belt tracking issues from a damaged smooth pulley surface
• Excessive belt vibration in the accessory drive system
• Noisy operation from a failing idler bearing assembly
• Service replacement for deteriorated factory idler hardware

Installation Notes and Tips

Verify pulley diameter, belt width, and mounting-hole dimensions before installation. Confirm the vehicle uses the listed accessory drive configuration, including factory air, serpentine belt, fixed mounting stud, or bracket-specific applications where noted. Inspect the belt, tensioner, and adjacent pulleys during service so the new idler assembly is installed into a clean, aligned drive system.

Quality Assurance

Hayden manufactures belt drive components for accessory drive service, and this idler assembly is built to match the listed dimensions and application requirements for the specified Ford, Lincoln, and Mercury vehicles.