My Account
Shopping Cart

Sierra 18-2055 Marine Oil Seal for Mercury Marine & MerCruiser Stern Drive

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

18-2055
08/07/2036 10:48 AM
Sale Price

$15.33

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 18-2055 Marine Oil Seal is a precision-fit replacement seal designed for Mercury Marine outboard and MerCruiser stern drive applications. Engineered to meet or exceed original equipment specifications, this seal protects shafts and bearings from the ingress of dirt and contaminants while preventing oil or grease leakage.

Key Features:

  • Shaft (I.D.): 0.750 in.
  • Outer Diameter (O.D.): 1.127 in. (28.63 mm)
  • Width: 0.149 in. (3.78 mm)
  • Application: Lower water pump base seal for Mercury Marine outboard and MerCruiser stern drive engines
  • Sold individually

OEM & Cross-Reference Part Numbers:

  • Mercury Marine OEM: 26-79831
  • Also replaces: 47-2055, AP280, GLM85580, 92-85580D, 9-76117, OMC 341280
  • Sierra UPC: 030999310064

Sierra International oil seals are manufactured to deliver reliable, leak-free performance and are built to equal or surpass the OEM parts they replace, making them a trusted choice for marine engine maintenance and repair.

Very happy

Awesome so far

Best prices on the net. Great selection.

It was fine

First order. Lets see how it goes.

Great prices and fast shipping. What more are you looking for?

right parts, right price

Excellent business and a pleasure to deal with. Lowest prices on the net and great communication between the business and myself. Will purchase from again!

Quick and to the point. No signing up for email newsletters and all that junk. Great shipping rates as well

Easy website to shop on. Good phone support. Package will be arriving in a timely manner. All in all seems like a good company.

Easy site to navigate with a nice GUI.

Very cheap prices compared to most other performance markets.

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