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Sierra 18-3979 Piston Ring Set for Mercury/Mariner Outboards 70-115HP

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

18-3979
08/07/2036 5:40 AM
Sale Price

$34.48

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Usually delivered within 2 days

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Fitment guaranteed

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Product Details

The Sierra 18-3979 Piston Ring Set is a standard bore replacement ring set engineered for Mercury and Mariner 2-stroke outboard motors ranging from 70 to 115 horsepower. Machined to precisely match engine component mating surfaces, these piston rings deliver a reliable, leak-free seal that meets or exceeds original equipment specifications.

Key Features:

  • Standard bore size: 3.375 inches
  • 2-ring set — includes two piston rings per set
  • Direct replacement for Mercury Marine OEM part number 39-96170A12
  • Interchangeable with GLM 14910 and Mallory 9-54229
  • Meets or exceeds original equipment manufacturer (OEM) specifications
  • Backed by Sierra's Limited Customer Satisfaction Warranty — warranted to be free of defects in workmanship and materials for the useful life of the product

Sierra has been a trusted supplier of aftermarket marine engine parts for over 50 years. The 18-3979 piston rings are compatible with Mercury Marine 2-stroke inline outboard engines spanning multiple model years and horsepower ratings, making them a go-to choice for marine technicians and DIY mechanics performing engine rebuilds or top-end repairs.

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