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Sierra 18-0319 Powerhead Base Gasket for Mercury/Mariner Outboard Engines

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

18-0319
08/05/2036 12:13 AM
Sale Price

$15.87

In Stock (10+)

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Usually delivered within 2 days

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No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Sierra 18-0319 is a replacement powerhead base gasket engineered for Mercury and Mariner 2-cylinder and 3-cylinder outboard engines ranging from 30 to 90 HP. This composite gasket seals the critical junction between the powerhead and the midsection, preventing exhaust and water leaks that can lead to engine damage.

Key Features:

  • Composite construction designed to meet or exceed original equipment quality
  • Precision fit for correct sealing performance
  • Replaces OEM Mercury/Mariner part numbers: 27-828553, 27-8M0000822, 8M0000822, 27-812865, 27-822420
  • Also interchangeable with GLM part number 37861
  • Sold individually

Compatible Applications Include:

  • Mercury/Mariner 18XD, 20XD (2 cyl), 25XD
  • Mercury/Mariner 15–25 HP (2 cylinder)
  • Mercury/Mariner 30–60 HP (2 cylinder and 3 cylinder)
  • Mercury/Mariner 65 Jet, 75 HP (3 cyl), 90 HP (3 cyl)

Sierra International is a trusted name in aftermarket marine parts, offering a comprehensive range of engine components built to OEM standards. The 18-0319 powerhead base gasket is an ideal solution for engine rebuilds, powerhead replacements, or routine maintenance on compatible Mercury and Mariner outboard motors.

Ordering was easy. Hopefully shipping will go as smooth.

Easy to use site. Found what I needed quickly.

Normal, easy to checkout.

survey after

so far so good.. we will see how the rest pans out

Easy

found what I need at the price I want to pay. there is not a lot of details on what you are buying. I found I had to check with other sites to insure I was buying what I wanted. also postponed buying brakes becuase of this.

So far not bad but didn't give a engine option. Hope it's the right one

I searched the entire web looking for the best price on my item and found that Autoplicity beat everybody else in price & quality. Search no more!

so far good

Competitive prices. Quick check out

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