My Account
Shopping Cart

Sierra 18-3886 Head Gasket for Nissan/Tohatsu 90HP 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

18-3886
07/11/2036 1:12 AM
Sale Price

$30.84

2 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 18-3886 is a replacement head gasket engineered for Nissan and Tohatsu 90HP outboard engines. Manufactured by Sierra International, this gasket is designed to provide a reliable, leak-free seal between the cylinder head and engine block, maintaining proper compression and preventing coolant or oil intrusion into the combustion chamber.

Sierra International is a trusted OEM-quality supplier of marine engine components, and this head gasket is manufactured to meet or exceed the original equipment specifications for the applicable Nissan and Tohatsu outboard motors.

Key Features:

  • Direct OEM-replacement head gasket for Nissan/Tohatsu 90HP outboard motors
  • Engineered to meet or exceed original equipment manufacturer specifications
  • Designed for a precise, leak-free fit to maintain proper engine compression
  • Manufactured from durable, marine-grade materials resistant to heat, pressure, and corrosion
  • Sierra International part number: 18-3886

Sierra's 18-3886 head gasket is an essential component for engine rebuilds, top-end overhauls, or any repair requiring cylinder head removal on compatible Nissan and Tohatsu 90HP outboard engines.

great to find everything you need with one stop.

easy to use site, great price, wide choice of payment types

New shopper

good so far

Great place to shop, low prices and ease of website to browse!

Smooth check out process.

Good so far.

Was a little hesitant to order from autoplicity at first but after numerous orders now, this and rockauto are my two go to places for parts. Best prices and fast shipping!!!

Happy with the prices less than half the price of local parts. Quick easy checkout.

Quick and Easy so far.

Quick and straight forward. Good Job!

Good

1st class service

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