Hayden 5987 Accessory Drive Belt Tensioner Pulley

Hayden 5987 Accessory Drive Belt Tensioner Pulley

Hayden 5987 is an accessory drive belt tensioner pulley for Mercedes-Benz applications that use a smooth serpentine belt contact surface. Built with a black plastic pulley body and a 2.750-inch outside diameter, it supports proper belt routing in accessory drive systems where a smooth back idler pulley is required.

Use this Hayden pulley when replacing a worn idler or tensioner pulley on select Mercedes-Benz 190E, 260E, 300E, 300SE, 300SEL, 300TE, 300CE, 300SL, 300SD, C280, C36 AMG, E320, S320, SL320, and S350 models. Hayden 5987 meets or exceeds OEM requirements and cross-references Gates 38047 and Dayco 89043 for the same application.

Key Features

• Accessory drive belt tensioner pulley / idler pulley
• Plastic construction with black finish
• Smooth groove design for serpentine belt systems
• 2.750-inch outside diameter for OE-style belt tracking
• 0.375-inch bore diameter and single mounting hole
• Back idler pulley style for smooth-belt routing
• Meets or exceeds OEM specifications

Detailed Product Overview

This Hayden pulley is engineered for Mercedes-Benz accessory drive belt systems that use a smooth pulley surface rather than a grooved ribbed design. The 1.000-inch pulley width, 25.4 mm belt width, and 69.850 mm outside diameter align with common OE-style belt path requirements, helping maintain consistent belt contact across the drive system. Hayden Pulley 5987 is a direct-fit service part for many Mercedes-Benz models from 1986 through 1999, including 1994-1999 Mercedes-Benz S320 and 1986-1993 Mercedes-Benz 300E applications.

The part number 5987 is also used across multiple interchange references, making it a practical replacement choice when servicing the accessory drive belt system on Mercedes-Benz C280, E320, SL320, and related chassis. Because this is a smooth back idler pulley, it should be matched only to applications specified for smooth pulley use.

What It Helps Address

• Squealing or chirping from a worn accessory drive pulley
• Belt tracking issues caused by pulley wear or surface damage
• Excessive play or rough rotation in the idler/tensioner pulley
• Accessory belt noise during engine operation
• Service replacement for a deteriorated smooth serpentine pulley

Installation Notes and Tips

Confirm the vehicle uses a smooth accessory drive belt idler or tensioner pulley before ordering. This pulley is not a grooved ribbed pulley, so it must be matched to the correct belt path and pulley style. Mounting hardware is not included, and the single mounting hole should be checked against the original component before installation. Verify belt width, bore diameter, and outside diameter against the removed part to ensure proper fitment on Mercedes-Benz 190E, 300E, 300TE, C280, and other listed applications.

Quality Assurance

Hayden 5987 meets or exceeds OEM requirements for the listed applications. It is a replacement pulley built for service use in accessory drive belt systems where OE-style dimensions and smooth pulley operation are required.