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Sierra 118-3445 Water Pump Base for Mercury/Mariner Outboard Motors

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

118-3445
06/01/2036 6:45 AM
Sale Price

$66.72

In Stock (6)

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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 18-3445 is a replacement water pump base designed for Mercury and Mariner outboard motors. This component is composed of high-quality, marine-grade material engineered to provide reliable cooling system performance in demanding marine environments.

Key Features:

  • Constructed from high-quality, marine-grade material for durability and corrosion resistance
  • Precision-engineered to ensure proper pump and driver alignment
  • Direct replacement for worn or damaged water pump bases
  • Fits Mercury and Chrysler outboard motor applications

OEM Cross-References:

  • Interchangeable with Chrysler/Force/US Marine 46-812966A3
  • Also interchangeable with GLM 12352, Mallory 9-43330, Mercury Marine 46-812966A3, 46-812966A7 and 46-812966A9

Sierra International is a trusted manufacturer of premium marine replacement parts, offering OEM-quality components at competitive prices. This water pump base ensures your outboard motor's cooling system operates at peak efficiency.

I found that boatplicity had the best price I could find on the Scotty rod holders and mounts that I needed. I had never ordered from or heard of them before. But I took a chance and placed an order with them anyway because of the lowest price. I was pleasantly surprised! Everything went GREAT!!! I would buy from them again!!! (I do think I should have gotten free shipping on an order that was over $100.00 but I did not.)

FAST DELIVERY. NO ISSUES AT ALL. Would highly recommend

great fast easy to navigate cheap 2 day shipping

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I found the engine mounts I needed but THM did not carry the transmission mounts I needed from the same manufacturer. I had to go directly to the manufacturer website (Innovative) to find them. THM had the best price on the engine mounts though.

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