Sierra 118-15100 Serpentine Belt 13/16" x 106.25" for MerCruiser Stern Drives

The Sierra 118-15100 is a premium-quality aftermarket serpentine belt engineered specifically for MerCruiser stern drive applications. This heavy-duty belt measures 106.25 inches in length by 13/16 inch (0.813 inch) in width, providing reliable power transfer to critical engine accessories.

Key Features:

• Constructed with high-quality polychloroprene rubber and polyester fiber tensile members for superior durability
• Oil-resistant and temperature-stable design withstands harsh marine environments
• Engineered to meet or exceed OEM specifications for proper fit and function
• Compression section uses specialized rubber to evenly distribute load strains and prevent slippage
• Reinforced construction resists stretching and maintains consistent tension throughout the belt's service life

This serpentine belt drives essential engine components including the alternator, power steering pump, air conditioning compressor, and water pump. It serves as a direct replacement for multiple MerCruiser OEM part numbers including 57-865615Q03, 57-865615003, 57-8638763, 57-862087A1, and 57-862087. Sierra marine products are backed by quality construction and designed to deliver reliable performance in demanding marine applications.