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Sierra 118-0971 Bypass Gasket for Johnson Evinrude Outboard Motors

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

118-0971
06/01/2036 4:36 AM
Sale Price

$7.11

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Usually delivered within 2 days

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Product Details

The Sierra 118-0971 is a high-quality bypass gasket engineered specifically for Johnson and Evinrude outboard motors. This precision-manufactured gasket provides reliable sealing for 25 HP and 35 HP OMC outboard marine engines, ensuring proper coolant flow and preventing leaks in the cooling system.

Key Features:

  • Durable, non-corrosive construction designed to withstand harsh marine environments
  • Precision-machined to perfectly match engine component mating surfaces
  • Meets or exceeds original equipment manufacturer quality standards
  • Hard-wearing gasket seal ensures long-lasting, reliable performance
  • Engineered to match the exact fit and function of the OEM gasket

Cross-Reference Information:

  • Replaces OEM Part Number: 319661
  • Interchangeable with: GLM 34340, Johnson/Evinrude 319661, OMC 319661

This replacement gasket is essential for maintaining proper engine cooling system performance. A damaged or deteriorated bypass gasket can lead to coolant leaks and reduced engine efficiency. Sierra Marine has been manufacturing premium aftermarket marine engine parts for over 50 years, providing boaters with dependable replacement components backed by an industry-leading warranty.

Items were as described and appear to work as intended. Have not test drove the car to make sure the ignition coils function under load/boost. They shipped from a reputable supplier so I am confident in the purchase.

Can&rsquo;t wait to receive the part. Great pricing all around, from part to shipping.

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