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Sierra 18-3719 Pinion Nut for MerCruiser Alpha One and OMC Sterndrive

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

118-3719
08/05/2036 11:33 PM
Sale Price

$5.19

1 left at this price

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Usually delivered within 2 days

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No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Sierra 18-3719 is a high-quality pinion nut designed for marine lower unit drive shaft applications. This component features 5/8"-18 thread size and requires a 1 1/16" wrench for installation, making it a critical fastening component for drive shaft assemblies in sterndrive and outboard motor lower gear housings.

Key Features:

  • Precision-manufactured marine-grade pinion nut
  • 5/8"-18 thread specification for proper fitment
  • 1 1/16" wrench size for secure installation
  • Meets or exceeds OEM specifications
  • Corrosion-resistant construction for marine environments

OEM Cross-Reference Numbers:

  • Mercury/MerCruiser: 11-35921, 11-47411, 11-826375, 11-F694188
  • Evinrude/Johnson: 314730
  • Chrysler: 11-F694188, 11-826375
  • GLM: 11190
  • Mallory: 9-78103

This pinion nut is commonly used in MerCruiser MR, Alpha One, and Alpha One Gen II lower gear housing assemblies, as well as OMC Sterndrive and Cobra applications. Each Sierra product meets or exceeds the original equipment part it replaces, ensuring reliable performance and durability in demanding marine conditions.

Smooth transition with a great price. Install went perfectly!

It was a good experience

Very easy shopping experience for the parts I need

Quick and easy. Conversation with rep was easy and quick as well.

none

Amazing! I scoured the internet for a few days for a hard to find battery. I found it here for a few hundred dollars less & I received it the next day! I was blown away! I will use THMotorsports as a resource from here on! Thank you!

fast shipping, easy to place an order.....

It was fast and easy

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