Dayco 5120646HDK1 HD FEAD Fan Drive Belt Kit for PACCAR MX-13 Diesel

The Dayco 5120646HDK1 is a heavy-duty front-end accessory drive (FEAD) fan kit engineered specifically for PACCAR MX-13 diesel engines found in Kenworth and Peterbilt commercial trucks. Designed to meet stringent OE standards for fit, form, and function, this kit delivers everything needed to restore the fan drive belt system to like-new performance in a single part number.

Dayco heavy-duty serpentine belt kits are OE-engineered to perform in the most demanding environments where safety and productivity are essential. Each kit is built to handle the higher torque and power pulses characteristic of heavy-duty diesel powertrains — making them a trusted choice for fleet maintenance and owner-operators alike.

Kit Contents:

• Premium heavy-duty tensioner engineered to OE design standards
• Heavy-duty dual bearing idler pulleys with long-life construction
• Diesel-grade serpentine belt specially treated to increase flexibility, reduce rib cracking, and run cooler under sustained load

Key Features:

• OE-equivalent design ensures proper fit and reliable performance
• Diesel-grade belt construction handles extreme heat and high-load operating conditions
• All application-specific components included for a complete fan drive repair
• Engineered to meet or exceed PACCAR OE specifications for Kenworth and Peterbilt platforms
• Reduces vibration and extends belt life through matched, system-level component design

The Dayco 5120646HDK1 is the professional-grade solution for fan drive belt system service on PACCAR MX-13 equipped trucks, eliminating the guesswork of sourcing individual components and ensuring all parts are matched to work together from the factory.