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

Manufacturer

Sierra

<p>For nearly six decades, Sierra has established itself as one of the marine industry's most trusted names in aftermarket engine and drive parts. Founded as a specialized marine parts manufacturer, Sierra has grown into a comprehensive supplier of replacement components, instrumentation, and accessories for both recreational and commercial boating applications. Operating from their 300,000-square-foot distribution center in Litchfield, Illinois, Sierra serves boat owners and marine technicians worldwide with an extensive catalog of parts engineered specifically for the harsh saltwater environment.</p><h3>Marine Engine Excellence</h3><p>Sierra's reputation was built on delivering precision-engineered internal engine components and drive system parts that meet or exceed OEM specifications. Their <a href="/7570-sierra-engine-gasket-set-5404">engine gasket sets</a> provide critical sealing solutions for inboard and outboard motors, while their <a href="/7570-sierra-engine-complete-assembly-15341">engine complete assemblies</a> offer comprehensive replacement options for major overhauls. Each component undergoes rigorous testing to ensure reliability in demanding marine conditions, from corrosion resistance to temperature cycling performance.</p><h3>Instrumentation and Monitoring Systems</h3><p>Accurate instrumentation is essential for boat operators to monitor engine health and prevent costly breakdowns on the water. Sierra's comprehensive line of <a href="/7570-sierra-gauges-200483">gauges</a> includes everything from fuel pressure and temperature indicators to voltmeters and trim gauges, all designed with marine-grade materials that withstand vibration, moisture, and UV exposure. Their <a href="/7570-sierra-tachometer-gauge-1488">tachometer gauges</a> deliver precise RPM readings critical for optimizing engine performance and fuel efficiency. Supporting these instruments, Sierra's <a href="/7570-sierra-gauge-resistor-47908">gauge resistors</a> ensure proper signal conditioning and accurate readings across various sensor types and engine configurations.</p><h3>Expanded Product Portfolio</h3><p>In 2022, Sierra significantly broadened its scope beyond traditional marine engine parts to encompass a wider range of boating accessories and even outdoor power equipment components. This strategic expansion brought established marine brands like Shields and Moeller under the Sierra umbrella, creating a one-stop resource for marine maintenance and replacement parts. The company now offers fuel systems, electrical components, battery charging solutions, and NMEA electronics alongside their traditional engine parts lineup.</p><h3>Quality Backed by Industry-Leading Warranties</h3><p>What sets Sierra apart in the crowded aftermarket marine parts market is their commitment to standing behind every component they manufacture. Their warranty coverage extends beyond simple part replacement—it includes shop labor, haul-out fees, towing charges, and related incidental costs should a warrantied part fail. This comprehensive protection reflects the company's confidence in their manufacturing processes and quality control standards. For boat owners facing repairs far from shore or mechanics working on customer vessels, this peace of mind is invaluable. Whether you're maintaining an outboard motor, rebuilding an inboard engine, or upgrading your boat's instrumentation, Sierra's decades of marine industry experience and commitment to quality make them a reliable choice for keeping your vessel running at peak performance.</p>

Part Number

118-15100
06/02/2036 5:56 PM
Sale Price

$105.60

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Usually delivered within 2 days

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Product Details

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.

The prop was exactly what i ordered. much thicker than my repaired prop has been.

Very satisfied

Great service

Fast fulfillment

lot of searching

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