My Account
Shopping Cart

Sierra 18-3847 Cylinder Head Gasket for Yamaha 2-Stroke 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

18-3847
07/12/2036 2:09 PM
Sale Price

$28.34

3 left at this price

delivery box

Usually delivered within 2 days

Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Sierra 18-3847 is a replacement cylinder head gasket engineered for Yamaha 2-stroke outboard motors. Manufactured by Sierra (a SeaStar Solutions brand), this head gasket is a direct aftermarket replacement for OEM Yamaha part numbers 6L2-11181-A1-00 and 6L2-11181-A2-00, offering a reliable and cost-effective alternative to the original equipment component.

The cylinder head gasket creates a critical seal between the cylinder head and the engine block, maintaining proper compression and preventing combustion gases, coolant, and oil from leaking into unintended areas. Replacing a worn or blown head gasket promptly is essential to protecting engine performance and longevity.

Key Features:

  • Direct replacement for Yamaha OEM part numbers 6L2-11181-A1-00 and 6L2-11181-A2-00
  • Designed for 2-cylinder, 2-stroke Yamaha outboard engines
  • Manufactured by Sierra / SeaStar Solutions, a trusted name in marine aftermarket parts
  • Restores proper cylinder head sealing and engine compression
  • Quality construction to meet or exceed OEM specifications

OEM Cross-Reference Numbers: 6L2-11181-A1-00, 6L2-11181-A2-00

Awesome company!!!!!! Will definitely order from here again! Order arrived fast. Was exactly as described/pictured. Great price!

easy, quick, direct!

Best price with tax and shipping I found, so far so good.

good

Definitely the best price online by far! And the option to check out using Amazon is an added bonus. This will be my first stop for any future needs.

ROCKAUTO CHARGES 11.38 EA

Thanks - Great Product. Fast Shipping. Plus they answer the phones!

So far, so good.

Good lookin fam #gym

Very fast shipping. Excellent item detail and description available before purchase. Best price on the net!

Shipping was prompt. The Du-Ha storage bin was the correct model for my truck, so the description was accurate. The price on Autoplicity was very competitive.

The order process is simple and efficient. Shipping was quick. Price was excellent.

Autoplicity had the best prices on the parts I needed. Their description of the products I was interested in was excellent! Shipping was very fast. Thanks Autoplicity I will be back!

Share icon
Return Policy
Returns are easy at Boatplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy