Gates K040315 Serpentine Belt

Gates K040315 Premium OE Micro-V Belt

The Gates K040315 is a Premium OE Micro-V serpentine belt built for precise fit and consistent accessory drive performance. It uses OE-matched size, construction, and materials to serve a wide range of import and domestic applications, including BMW X5, BMW X6, Honda Civic, and Lexus GS450h fitments.

Key Features

• Part number: K040315
• Premium OE Micro-V belt line from Gates
• 4-rib automotive V-ribbed belt design
• EPDM belt material for durability in accessory drive service
• Polyester cord construction for stable belt strength
• OE Performance comparison rating
• Effective length: 31.65 in. / 804 mm
• Outside circumference: 32.25 in. / 818 mm
• Top width: 0.56 in. / 14 mm

Product Details

Gates Premium OE Micro-V belts are engineered to match original equipment dimensions and material specifications, helping maintain proper drive alignment and accessory operation. The K040315 is a K-section, 4-rib serpentine belt used across air conditioning, alternator, water pump, power steering, and fan drive applications depending on vehicle configuration. This part cross-references Continental 4K800 and Dayco 5040315 for the same application.

Compatible With BMW X5 and BMW X6 air conditioning applications, Honda Civic alternator and air conditioning applications, Lexus GS450h water pump applications, and Smart Fortwo water pump and alternator applications. It also appears in fitments for BMW 550i, 650i, 750i, and related xDrive and Gran Coupe models, along with select Acura, Geo, Pontiac, Scion, Suzuki, Toyota, Chevrolet, Ford, GMC, and Nissan applications.

Common Uses

• Restoring proper accessory drive operation when the original belt is worn or glazed
• Addressing belt noise caused by cracking, hardening, or rib wear
• Correcting charging or cooling accessory drive issues tied to belt slip
• Replacing a stretched belt that no longer maintains proper tension
• Supporting air conditioning, alternator, water pump, or power steering drive service

Installation Notes and Tips

Verify belt routing, rib count, and measured length before installation. Confirm the vehicle position listed in the fitment data, since this belt is used in multiple accessory locations including air conditioning, alternator, water pump, fan and alternator, and power steering. Inspect pulleys, tensioners, and idlers for wear before installing the new belt, and replace any damaged components that could shorten belt life. For BMW X5, BMW X6, Honda Civic, and Lexus GS450h applications, match the exact engine and accessory configuration shown in the vehicle catalog.

Quality Assurance

Gates manufactures this Premium OE Micro-V Belt to OE-size, OE-construction, and OE-material standards for consistent fit and performance across import and domestic vehicles. The K040315 is built as an OE Performance replacement for service work that requires accurate dimensions and dependable accessory drive operation.