Dayco 5040365 Serpentine Belt

Dayco 5040365 Serpentine Belt Overview

The Dayco 5040365 serpentine belt is a 4-rib accessory drive belt built with EPDM and aramid reinforcement for consistent operation across a wide temperature range. It is sized for applications that call for a K-section belt with a 36.50-inch effective length and 37.16-inch outside circumference.

Use this belt for direct replacement service on select Ford Transit-150, Ford Transit-250, Ford Transit-350, and Ford Transit-350 HD applications, along with multiple import and domestic vehicles that specify the same belt profile and length. The Dayco 5040365 is engineered to meet SAE J1459 and SAE J2432 standards.

Key Features

• Part number: 5040365
• EPDM construction with aramid reinforcement for durability
• 4-rib, K-section serpentine belt design
• Top width: 0.54 in.
• Effective length: 36.50 in. (927.10 mm)
• Outside circumference: 37.16 in. (943.87 mm)
• Operating temperature range: -45°F to 212°F
• Straight rib profile for accessory drive applications
• Meets SAE J1459 and SAE J2432 standards

Detailed Description

Dayco 5040365 is a black serpentine belt designed for accessory drive systems that require a 4-rib K-section profile. Its EPDM rubber construction helps maintain belt integrity under heat and cold, while aramid reinforcement adds strength for demanding accessory loads. This makes it a practical replacement choice for vehicles using the same belt dimensions and rib count, including Ford Transit-150 and Ford Transit-250 models, as well as Ford Transit-350 and Ford Transit-350 HD applications with air conditioning service.

This part cross-references Gates K040365 and Continental-ContiTech PK040365 for the same application. It also aligns with fitments such as 2006-2009 Chevrolet Trailblazer, air conditioning and tensioner, and 2014-2019 INFINITI Q70, power steering, where the specified belt configuration matches.

What It Helps Fix

• Squealing or slipping accessory drive belt noise
• Cracking, glazing, or visible wear on the belt surface
• Loss of drive to air conditioning, power steering, alternator, or fan systems
• Incorrect belt length or rib profile during replacement service
• Reduced belt performance in hot or cold operating conditions

Installation Notes and Tips

Verify the belt routing, rib count, and measured length against the vehicle’s accessory drive system before installation. This belt is listed across multiple positions, including air conditioning, power steering, fan and alternator, fan and power steering, and air conditioning and tensioner applications, so confirm the exact engine accessory layout for your vehicle. For fitment-based searches, this part is commonly selected for 2020-2026 Ford Transit-150 air conditioning service and 2014-2019 INFINITI Q70 power steering applications.

Compatible With: 2020-2026 Ford Transit-150, air conditioning; 2022-2026 Ford Transit-250, air conditioning; 2022-2026 Ford Transit-350, air conditioning; 2022-2026 Ford Transit-350 HD, air conditioning; 2014-2019 INFINITI Q70, power steering.

Quality Assurance

Dayco manufactures this belt to SAE J1459 and SAE J2432 standards, supporting consistent fit and material specification for accessory drive service. The 5040365 part number is used across a broad range of OE and aftermarket cross-references, including Ford Transit, Chevrolet Trailblazer, GMC Envoy, and INFINITI Q70 applications.