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Sierra 118-3239 Impeller Repair Kit for Mercury Mariner Outboard

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

118-3239
06/03/2036 7:35 AM
Sale Price

$17.56

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Usually delivered within 2 days

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Fitment guaranteed

Fitment guaranteed

Product Details

The Sierra 118-3239 Impeller Repair Kit is designed specifically for Mercury and Mariner outboard engines with small gear cases under 9.9 horsepower. This complete repair kit provides all the essential components needed to service your outboard motor's cooling system and prevent engine overheating.

Complete Kit Includes:

  • Sierra 18-3039 Impeller
  • Sierra 18-3139 Impeller Plate
  • Sierra 18-7409 O-Ring

Key Features:

  • Designed for Mercury/Mariner outboard cooling systems
  • Fits outboard motors from 3.9 HP to 9.8 HP applications
  • Meets or exceeds original equipment manufacturer specifications
  • Interchangeable with GLM 12270
  • Replaces OEM part numbers: 47-3239, 18-3239D

The impeller is a critical component of your outboard's cooling system, circulating water through the engine to prevent overheating. Regular impeller replacement is essential preventative maintenance that helps ensure reliable engine performance and longevity. Sierra marine parts are engineered to meet OEM specifications, providing dependable quality at an affordable price.

Great website and easy to find what I was looking for. Prices were very competitive also.

Extremely satisfied with my product. It arrived without any issues. The box was marked and packaged very well to ensure there would be no damage since the item was fragile. I had a great experience from start to finish. Will definitely order again from Boatplicity.

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Hello...I&#039;m a new customer and I&#039;m very excited to receive the parts I ordered and it gets here on time. Thank you

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