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Sierra 118-0297 Lower Unit Oil Seal for Mercury/Mariner Outboards

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

118-0297
06/01/2036 5:54 AM
Sale Price

$10.24

In Stock (5)

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Usually delivered within 2 days

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Product Details

The Sierra 118-0297 is a precision-engineered lower unit oil seal designed as a direct replacement for Mercury and Mariner outboard engines. This seal directly replaces OEM Mercury part number 26-82234M and is also cross-referenced with Yamaha 93101-23070-00, making it a versatile solution for common outboard drivetrain maintenance.

Engineered by Sierra — a SeaStar Solutions brand — this oil seal is built to meet or exceed original equipment manufacturer (OEM) specifications. It features a rigid circular metal exterior bonded to a flexible interior sealing member, forming a reliable barrier that protects shafts and bearings from water intrusion, dirt, and foreign debris while preventing gear lube from escaping the lower unit.

Key Features:

  • Replaces OEM Mercury/Mariner part 26-82234M
  • Cross-references: Yamaha 93101-23070-00, 47-0297, AP2039, 9-76413, 30999872975
  • Shaft diameter: 0.906 in.
  • Outer diameter: 1.457 in.
  • Width: 0.236 in.
  • Meets or exceeds OEM fit, form, and function
  • Backed by the SeaStar Solutions Two-Year Warranty

Sierra marine engine parts are trusted by boaters and marine technicians worldwide for their proven quality and reliability. This seal is an essential component during lower unit service and gear lube changes on Mercury and Mariner outboard motors.

Very simple process hopefully fast shipping.

Quick and easy check out

Easy purchase, fast shipping!!!

Easy process

Exact replacement

Easy ordering process

All good

Product came very quickly, it's just what I was looking for.

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