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Sierra 18-2739 Marine Exhaust Plate Gasket for Mercury/Mariner 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

18-2739
08/23/2036 6:42 AM
Sale Price

$45.56

In Stock (10+)

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Usually delivered within 2 days

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No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Sierra 18-2739 is a premium aftermarket exhaust plate gasket engineered as a direct replacement for Mercury and Mariner outboard motors. Designed for use on Mercury 200–300 HP 3.0L V6 outboard engines, this gasket seals the lower exhaust adapter plate and helps prevent exhaust leaks that can compromise engine performance and longevity.

Key Features:

  • Precision-engineered to meet or exceed OEM specifications for Mercury and Mariner outboard applications
  • Replaces Mercury Marine OEM part numbers: 27-832933006, 27-8329331, 27-8329332, 27-8329333, 27-8329334, and 27-8329335
  • Also replaces Mercury Race Outboard part numbers: 27-832933006 and 27-8329335
  • Cross-references: SIE 2739, SIE18-2739, 01-1422, 1437-3501, 14373501
  • Built to withstand the demanding heat and moisture of the marine exhaust environment
  • Backed by Sierra's Limited Customer Satisfaction Warranty covering defects in workmanship and materials for the useful life of the product

Sierra has been a trusted name in marine aftermarket parts for over 50 years, supplying boaters and professional marine technicians with reliable, high-quality components. The 18-2739 exhaust plate gasket is ideal for scheduled maintenance or repair of Mercury 200, 225, 250, and 300 HP 3.0L V6 outboard powerheads.

first time will let you know

Quick and easy

Fast

Looked around online everywhere for my spark plug set. Autoplicity had what I wanted at the lowest price. Thanks guys!

It was okay. Product doesn't completely look brand new, but I hope it does the job.

easy and efficient

Very good

Good

Good service and quick response. The prices were the best around and the business was completed quickly.

smooth experiance

<br>Good prices - seemed to be the best online! Shipping seems normal. / Handling time seemed delayed. If quality is good will order from again.

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