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Sierra 18-4698 Lower Unit Drain Fill Washer Gasket

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

118-4698
06/21/2036 6:39 PM
Sale Price

$3.41

In Stock (10+)

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Usually delivered within 2 days

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No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Sierra 18-4698 is a drain and fill washer designed for use on lower unit drain and oil level screws for Yamaha outboard motors and Mercury/Mariner engines. This marine-grade washer provides a direct replacement for various OEM parts and ensures a leak-resistant seal for critical lower unit applications.

Key Features:

  • Designed to meet OEM specifications
  • Sold individually for convenient replacement
  • Can be used with Sierra 18-2374 Magnetic Drain Screw
  • Durable construction for reliable sealing performance

Replaces OEM Part Numbers:

  • Mercury/Mariner: 27-81987, 27-81987M
  • Yamaha: 90430-08020-00, 604-45342-00-00, 90430-08801-00, YSG-14090-90-8G
  • Mallory: 9-60100

Important Installation Note: Apply clean oil to the screw threads and both gasket surfaces before installation. Tighten just until seated, then turn the screw an additional 45 degrees to achieve proper torque, or tighten to 7 ± 1 Nm (5.2 ± 0.7 lb-ft). Proper installation prevents oil leaks and water intrusion into the lower unit.

Quick and easy transaction

Talked to guy on chat before I ordered. Clint was very helpful!

Thanks

Everything was quick and simple.

No comment

Great. This is my 3rd order and has always been hassle free

Great service and fast delivery an a part that has been impossible to find! Kudos!

Good price and free shipping.

Quick and easy transaction, would prefer the packing department used a recyclable material instead of plastic based materials.

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