Dayco 5050455 Serpentine Belt

Dayco Serpentine Belt 5050455 Overview

The Dayco 5050455 serpentine belt is a 5-rib accessory drive belt built from EPDM with aramid reinforcement for consistent belt tracking and durability. It is sized for applications that call for a 45.50-inch effective length and a 46.16-inch outside circumference, with a K-section profile and straight ribs.

Compatible With select BMW, Chevrolet, GMC, Mazda, and Fiat applications, this belt is specified for accessory drive systems that power components such as the alternator, fan, air conditioning, power steering, and water pump, depending on vehicle configuration.

Key Features

• Dayco part number 5050455
• EPDM construction with aramid reinforcement
• 5-rib, K-section serpentine belt design
• Top width: 0.68 in.
• Effective length: 45.50 in. / 1155.70 mm
• Outside circumference: 46.16 in. / 1172.47 mm
• Operating temperature range: -45°F to 212°F
• Built to SAE J1459 and SAE J2432 standards

Detailed Description

Dayco 5050455 is an accessory drive serpentine belt engineered for vehicles that require a 5-rib, straight-rib belt with a K-section cross section. The EPDM rubber compound and aramid reinforcement are selected for strength and stable performance in accessory drive systems, while the listed temperature range supports operation in both cold and hot environments. This belt cross-references ACDelco 5K455 and Gates K050455 for the same application.

Fitment includes 2018-2020 Fiat 500L, 1999-2000 Mazda Protege, 1990-1994 BMW 750iL, 1991-1994 BMW 850Ci, 1991-1992 BMW 850i, 1990-1991 Chevrolet R3500, 1990-1991 Chevrolet V3500, 1990-1991 GMC R3500, and 1990-1991 GMC V3500. The Dayco 5050455 is also listed for accessory drive configurations on these vehicles, including fan, alternator, air conditioning, power steering, and water pump applications where specified.

Common Uses

• Restoring proper drive belt tension and accessory operation
• Replacing a worn or cracked serpentine belt
• Addressing belt squeal, glazing, or rib wear
• Correcting accessory drive slip on alternator, A/C, or power steering systems
• Servicing belt-driven fan or water pump applications on listed vehicles

Installation Notes

Verify the belt length, rib count, and cross section against the vehicle’s accessory drive routing before installation. Confirm the exact engine and accessory configuration, especially on BMW, Chevrolet, GMC, and Mazda applications where belt routing can vary by equipment package. Inspect pulleys, tensioners, and idlers for wear before installing the new belt, and make sure the belt seats fully in each pulley groove.

Quality Assurance

This belt is manufactured to SAE J1459 and SAE J2432 standards, with EPDM and aramid reinforcement specified for consistent accessory drive service. Dayco 5050455 is a direct-fit style replacement for the listed applications when the vehicle’s belt routing and dimensions match the published specifications.