Roadmax 8K991AP Serpentine Belt

Roadmax 8K991AP Serpentine Belt Overview

The Roadmax 8K991AP is a standard automotive V-ribbed serpentine belt built with EPDM and polyester cord for everyday accessory drive service. It is sized for 8-rib applications and is a direct-fit option for select Ford trucks and vans, including Ford F-150, Ford E-150 Econoline, and Ford Excursion applications.

Roadmax’s Automotive V-Ribbed Belt (Standard) line is aimed at buyers who want dependable belt construction without stepping up to a premium-performance belt. The 8K991AP follows that approach with a practical design for routine accessory drive replacement.

Key Features

• Part number: 8K991AP
• Type: Automotive V-Ribbed Belt (Standard)
• Material: EPDM for wear resistance in accessory drive service
• Cord material: Polyester
• Rib quantity: 8
• Top width: 1.087 in. (28 mm)
• Effective length: 99.08 in. (2517 mm)
• Outside circumference: 99.65 in. (2531 mm)
• Cross section designation: K

Detailed Description

The Roadmax 8K991AP serpentine belt is designed for accessory drive systems that rely on a multi-rib belt to turn engine-driven components. Its EPDM construction and polyester cord support consistent belt tracking and everyday durability in standard service conditions. This belt cross-references Gates K080991 and Continental 4080990 for the same application.

Compatible With Ford F-150, Ford E-150 Econoline, Ford E-250 Econoline, Ford E-350 Econoline, Ford Excursion, Ford F-250, Ford F-350, and Ford Expedition applications listed below, the 8K991AP is a practical replacement choice when servicing the accessory drive belt system on select Ford vehicles.

Vehicle Fitment

• Fits 2004 Ford F-150 Heritage, Accessory Drive
• Fits 2002-2003 Ford F-150, Accessory Drive
• Fits 1997-2001 Ford E-150 Econoline, N/A, W/A.C.
• Fits 1997-2001 Ford E-150 Econoline Club Wagon, N/A, W/A.C.
• Fits 1997-2001 Ford E-250 Econoline, N/A, W/A.C.
• Fits 1997-2001 Ford E-350 Econoline Club Wagon, N/A, W/A.C.
• Fits 1999-2001 Ford E-350 Super Duty, N/A, W/A.C.
• Fits 1999-2001 Ford Econoline, N/A, W/A.C.
• Fits 2000-2001 Ford Excursion, N/A, W/A.C.
• Fits 1997-2001 Ford F-150, N/A, W/A.C.
• Fits 1997-2001 Ford F-250, N/A, W/A.C.
• Fits 1999-2001 Ford F-350, N/A, W/A.C.
• Fits 1997-2000 Ford E-350 Econoline, N/A, W/A.C.
• Fits 1997 Ford Expedition, N/A, W/99" Belt O.C.

Common Replacement Reasons

• Squealing or chirping from the accessory drive belt
• Cracking, glazing, or visible rib wear on the belt surface
• Belt stretch that affects alternator, power steering, or A/C drive performance
• Loss of proper belt tension or tracking on the pulley system
• Routine maintenance replacement on Ford F-150, Ford E-150 Econoline, or Ford Excursion models

Installation Notes and Tips

Verify belt routing against the underhood diagram before installation, and confirm the belt length and rib count match the vehicle’s accessory drive layout. Inspect pulleys, tensioners, and idlers for wear before installing the new belt, since damaged components can shorten belt life and affect tracking.

For fitment-sensitive Ford applications, confirm the engine and accessory drive configuration before ordering the Roadmax 8K991AP.

Quality Assurance

Roadmax positions the Automotive V-Ribbed Belt (Standard) line as a value-focused option for customers who want quality construction for routine service. The 8K991AP uses EPDM belt material and polyester cord construction to support standard accessory drive replacement needs.