Dayco 5070579 Serpentine Belt - Main Drive, Power Steering or Air Conditioning and Idler

Serpentine Belt for BMW Z4 and Jaguar XJ12

Dayco 5070579 is a serpentine belt built for accessory drive service on select BMW and Jaguar applications. It uses EPDM rubber with aramid reinforcement for stable belt tracking, consistent rib engagement, and dependable operation across a wide temperature range.

Key Features

• EPDM, aramid reinforced construction for durability in accessory drive systems
• 7-rib K-section profile with straight ribs for positive pulley contact
• Black belt with a 0.96 in top width
• Effective length: 1470.00 mm (57.874 in)
• Outside circumference: 1484.20 mm (58.433 in)
• Operating temperature range: -45°F to 212°F
• Built to SAE J1459 and SAE J2432 standards

Detailed Description

Dayco 5070579 is a replacement serpentine belt for accessory drive systems that require a 7-rib K-section belt. It is listed for 2009-2016 BMW Z4, Main Drive applications and 1994 Jaguar XJ12, Power Steering, Air Conditioning and Idler applications. If you are searching for a Dayco 5070579 serpentine belt for BMW Z4 main drive service or a Dayco 5070579 belt for Jaguar XJ12 power steering and A/C routing, this part matches those confirmed applications.

The EPDM construction is paired with aramid reinforcement to support belt stability under heat, cold, and continuous pulley loading. The straight-rib profile and standard rib depth are specified to maintain consistent contact in the accessory drive belt system, while the listed dimensions help confirm proper routing and fitment before installation.

What It Helps Address

• Squealing or chirping from a worn accessory drive belt
• Cracking, glazing, or rib wear on the existing belt
• Loss of belt tension or inconsistent pulley engagement
• Accessory drive issues affecting charging, steering, or air conditioning operation
• Replacement needs for BMW Z4 and Jaguar XJ12 belt service

Installation Notes and Tips

Verify belt routing, rib count, and measured length against the original belt before installation. Confirm the application by position: Fits 2009-2016 BMW Z4, Main Drive; Fits 1994 Jaguar XJ12, Power Steering, Air Conditioning and Idler. Inspect pulleys, tensioners, and idlers for wear before installing Dayco 5070579, since damaged components can shorten belt life. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Quality Assurance

Dayco 5070579 is manufactured to SAE J1459 and SAE J2432 standards, with material and dimensional specifications provided for accurate replacement selection. Dayco 5070579 is a technical-fit serpentine belt for confirmed BMW Z4 and Jaguar XJ12 applications.