Dayco 5040338 Serpentine Belt

Dayco 5040338 Serpentine Belt Overview

The Dayco 5040338 serpentine belt is a K-section, 4-rib accessory drive belt built from EPDM with aramid reinforcement for stable operation across a wide temperature range. It is a direct-fit option for select vehicles needing an air conditioning, idler, tensioner, power steering, or air pump belt application.

Use this belt when servicing long-tail applications such as a 2001-2012 Hyundai Elantra air conditioning and idler belt, a 2004-2006 BMW X5 air conditioning and tensioner belt, or a 1998-2001 Nissan Altima air conditioning and idler belt. The Dayco 5040338 also cross-references Gates K040337 and K040338 for the same application.

Key Features

• EPDM construction with aramid reinforcement for durability and belt stability
• 4-rib, K-section profile with straight rib design
• Black finish with standard rib depth
• Effective length: 33.86 in. (860.05 mm)
• Outside circumference: 34.52 in. (876.81 mm)
• Top width: 0.54 in.
• Operating temperature range: -45°F to 212°F
• Built to SAE J1459 and SAE J2432 standards

Detailed Description

Dayco 5040338 is an accessory drive serpentine belt engineered for consistent belt tracking and dependable power transfer in belt-driven engine accessory systems. Its EPDM rubber construction and aramid reinforcement help it maintain shape and tension under heat, cold, and continuous accessory load. This makes it a practical replacement for vehicles that use a 4-rib K-section belt in air conditioning, idler, tensioner, power steering, or air pump positions.

Confirmed fitment includes applications such as 2001-2012 Hyundai Elantra, 2005-2010 Kia Sportage, 2004-2006 BMW X5, 1999-2005 Mazda Miata, and 2000-2004 Toyota Tundra. The Dayco 5040338 is also listed for select Subaru Forester, Toyota Corolla, Nissan Altima, Audi A4, and Volkswagen Passat applications, making it a useful OE-style replacement when the original belt size and rib count match.

What This Belt Helps Address

• Squealing or slipping caused by a worn accessory drive belt
• Cracking, glazing, or rib wear on the existing belt
• Loss of accessory drive performance for A/C, power steering, or idler systems
• Belt noise from age, heat cycling, or contamination
• Incorrect belt length or rib count during routine belt service

Installation Notes and Tips

Verify the belt routing, rib count, and effective length before installation. This part is listed across multiple positions, including air conditioning and idler, air conditioning and tensioner, power steering, and air pump, so confirm the exact engine accessory layout for your vehicle. For fitment-specific searches, use terms such as 2004 BMW X5 air conditioning and tensioner belt, 2008 Subaru Forester air conditioning and idler belt, or 1998-2000 Volkswagen Passat air conditioning and tensioner belt.

Inspect pulleys, tensioners, and idlers for wear before installing the new belt. A damaged pulley or weak tensioner can shorten belt life and affect tracking.

Quality Assurance

Dayco manufactures accessory drive components to meet SAE J1459 and SAE J2432 standards, supporting consistent material performance and dimensional accuracy for replacement service.