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Sierra 18-2912-1 Exhaust Manifold Gasket for MerCruiser OMC 3.0L Marine 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

118-2912-1
06/03/2036 12:33 AM
Sale Price

$13.48

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Product Details

The Sierra 18-2912-1 is a premium exhaust manifold gasket designed for marine inboard and sterndrive applications. This critical sealing component creates a leak-proof connection between the exhaust manifold and cylinder head on MerCruiser and OMC marine engines with GM 181 CID (3.0L) 4-cylinder powerplants.

Key Features:

  • Precision-engineered to match OEM specifications for proper exhaust port alignment
  • Manufactured from high-quality gasket material designed to withstand extreme exhaust temperatures and pressures
  • Direct replacement for OEM part numbers Mercury 27-53354, OMC 908079, and Mallory 9-61417
  • Compatible with MerCruiser 140 HP engines (1968-1982) and OMC stern drives with 3.0L GM blocks
  • Each gasket sold individually for precise replacement needs

Sierra Marine gaskets are engineered to meet or exceed original equipment manufacturer standards, providing reliable performance and durability in demanding marine environments. This exhaust manifold gasket helps prevent exhaust leaks, maintains proper engine backpressure, and protects against corrosive exhaust gases entering the engine compartment.

great price and availability

Shipping was extremely fast a on a hard to find Item, The price with free shipping was better than buying elsewhere with paid shipping I am very satisfied

Really straight forward

!

Checkout was smooth and the price was reasonable. If the delivery is as smooth as the checkout, I&#039;ll be buying another set for my wife soon.

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