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Sierra 18-3568 Thermostat Kit for Mercruiser Stern Drive Engines

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

118-3568
07/13/2036 11:20 PM
Sale Price

$17.75

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Product Details

The Sierra 18-3568 is a complete thermostat kit designed for Mercruiser stern drive applications with GM V-6 and V-8 engines featuring closed cooling systems. This 160-degree Fahrenheit thermostat kit ensures proper engine temperature regulation for optimal performance and longevity.

Kit Includes:

  • 18-3555 Thermostat (160°F)
  • 18-1508 Thermostat Seal

Compatibility:

  • 5.7L MIE (1998-2001, serial OL002003 and up)
  • MX 6.2L MPI (2000-2001, serial OL680003 and up)
  • 454 Horizon MIE (1998-2001, serial OL002200 and up)
  • 502 Mag MPI (1998-2001, serial OL017000 and up)
  • Fits 1998 and newer GM V-6 and V-8 engines with closed cooling systems

OEM Cross Reference: Replaces Mercruiser 99155T1

Sierra marine parts meet or exceed original equipment specifications, providing reliable replacement components for your marine engine cooling system.

These were long enough, unlike the first ones I ordered. Six foot doesn't do the job for even the smallest boats.

So far so good

Good experience

Easy

Mu experience was good. The product was what i needed at a good price.

issue was corrected very fast and easy thank you matt

Great service

Extremely satisfied!!!

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