Dayco 5030243 Serpentine Belt - Water Pump

Dayco 5030243 Serpentine Belt Overview

The Dayco 5030243 serpentine belt is a K-section accessory drive belt built with EPDM and aramid reinforcement for consistent operation in demanding engine bay conditions. It is a black, 3-rib belt with a 24.25-inch effective length and 24.91-inch outside circumference, making it a direct-fit option for select water pump drive applications.

Compatible With Buick Lucerne, Cadillac DTS, Cadillac DeVille, Cadillac Seville, Cadillac Eldorado, Oldsmobile Aurora, and Pontiac Bonneville water pump drive setups, this belt is specified for vehicles that require a 3-rib K-section profile. The Dayco 5030243 is also cross-referenced to common aftermarket and OE numbers for the same application.

Key Features

• EPDM construction with aramid reinforcement for durability and belt stability
• 3-rib K-section design with straight rib profile
• 24.25-inch effective length and 24.91-inch outside circumference
• Black finish with standard rib depth
• Operating temperature range from -45°F to 212°F
• Built to SAE J1459 and SAE J2432 standards

Detailed Description

Dayco 5030243 is a serpentine belt engineered for accessory drive system service where a compact 3-rib, K-section belt is required. Its EPDM rubber compound helps resist wear, while aramid reinforcement adds strength for stable tension transfer and dependable belt tracking. The straight rib profile and standard rib depth support smooth engagement on the pulley system.

This belt fits water pump applications on 2006-2011 Buick Lucerne, 2006-2011 Cadillac DTS, 1995-2005 Cadillac DeVille, 2004-2005 Pontiac Bonneville, 1995-2004 Cadillac Seville, 2001-2003 Oldsmobile Aurora, 1995-1999 Oldsmobile Aurora, and 1995-2002 Cadillac Eldorado. If you are searching for a Dayco 5030243 serpentine belt for a Buick Lucerne water pump or a Cadillac DTS water pump drive, this part number matches the listed applications.

This part cross-references Gates (e.g., K030243, K030245) for the same application.

What It Helps Address

• Squealing or slipping from a worn accessory drive belt
• Cracking, glazing, or fraying on the existing belt
• Loss of proper water pump drive performance
• Incorrect belt length or rib count during replacement
• Noise caused by belt wear or poor pulley engagement

Installation Notes and Tips

Verify the belt routing, rib count, and measured length against the vehicle’s accessory drive layout before installation. This belt is specified for water pump positions only, so confirm the application matches the engine configuration on your Buick, Cadillac, Oldsmobile, or Pontiac model. Inspect pulleys and tensioner components for wear before installing the new belt to help maintain proper tracking.

Quality Assurance

Dayco manufactures this belt to SAE J1459 and SAE J2432 standards, with EPDM and aramid reinforcement selected for durability across a wide operating temperature range. The part number is 5030243.