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Sierra 118-3644 Marine Thermostat Kit 160 Degree for MerCruiser

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

118-3644
06/01/2036 4:54 AM
Sale Price

$22.14

1 left at this price

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Usually delivered within 2 days

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No Hassle Returns

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Fitment guaranteed

Product Details

The Sierra 118-3644 Marine Thermostat Kit is a complete replacement solution designed for MerCruiser stern drive engines with 160-degree cooling systems. This comprehensive kit ensures proper engine temperature regulation and cooling system performance for GM V6 and V8 marine engines.

Kit Includes:

  • 18-3649 Thermostat (160°F operating temperature)
  • 18-2553 Thermostat Cover Gasket
  • 18-2917 Thermostat Gasket

Key Features:

  • Temperature rating: 160°F (71°C) for optimal engine performance
  • Engineered to meet or exceed OEM specifications
  • Direct replacement for MerCruiser stern drive applications
  • Compatible with GM small block and big block V6 and V8 engines
  • All gaskets included for complete installation

OEM Cross-Reference:

  • Replaces MerCruiser 807252T2, 8M0091470, 8072522, 8052732, 8M0109441
  • Replaces gaskets 27-47510 and 27-53045-1
  • Also replaces Crusader 97895, GLM 13100, Mallory 9-43002

Sierra marine parts are manufactured to withstand harsh marine environments and provide reliable performance for fresh water (closed) cooling systems. This complete kit eliminates the need to purchase components separately, ensuring you have everything needed for a proper thermostat replacement.

Very easy to navigate and great price.

Took a little bit to get shipped but other than that good experience.

Order clutch set for 1966 corvair it is not the correct part called customer service they say don't show one yet web says the one shown is correct

NOT A 2-day shipping like I paid for, but still received the product I ordered

I wish the products had a more detailed description such as listing of it was for the right or left side or the back or front of the vehicle. Having to google part numbers to determine which area of the car was for was quite inconvenient. Other than that it was a great experience with great prices!

Easy to order! Shipped promptly and was kept imformed on expected arrival date. No muss no fuss just good service! Thanks. Pete

Good pricing and easy site to navigate

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