SIERRA MARINE PARTS 18-3668 Thermostat Kit 030999316318 807252T4

( Brand: Sierra Marine Parts ), ( Manufacturer Part Number: 18-3668 ), ( Part Type: Thermostat ), ( Ipn: 807252t4 ), ( UPC: 030999316318 )

Review SIERRA MARINE PARTS Thermostat Kit For Mercury fits MERCRUISER

Introducing the Sierra Marine 18-3668 Thermostat Kit, specifically designed for use with Mercruiser Mercury 807252T4 engines. This thermostat kit is an essential component of your marine cooling system, ensuring optimal engine performance and longevity.

The Sierra Marine 18-3668 Thermostat Kit comes with a high-quality, brass thermostat housing that offers superior durability compared to its plastic counterparts. The housing is designed to withstand the harsh marine environment, resisting corrosion and damage from exposure to saltwater, sunlight, and extreme temperatures.

The kit includes a precision-engineered thermostat valve that maintains the ideal engine temperature. This thermostat is designed to open and close at specific temperatures, allowing coolant to flow through the engine when it's needed most and preventing it from overheating when it's not. The thermostat is also constructed from brass for superior heat conductivity and longevity.

The Sierra Marine 18-3668 Thermostat Kit also includes all necessary hardware for installation, including mounting bolts, gaskets, and O-rings. The kit is easy to install, with clear instructions provided to ensure a hassle-free experience.

This thermostat kit is an excellent investment for boat owners who want to ensure their engine runs at peak performance and efficiency. By maintaining the ideal engine temperature, the Sierra Marine 18-3668 Thermostat Kit helps prevent damage from overheating, extends the life of the engine, and improves fuel economy.

In summary, the Sierra Marine 18-3668 Thermostat Kit for Mercruiser Mercury 807252T4 engines is a high-quality, durable solution for maintaining optimal engine temperature. The brass thermostat housing and precision-engineered thermostat valve are designed to withstand the harsh marine environment and provide superior heat conductivity and longevity. The kit includes all necessary hardware for installation and is easy to install, making it a smart investment for any boat owner.

Pros and Cons of Buying Sierra Marine 18-3668 Thermostat Kit for Mercruiser Mercury 807252t4

The Sierra Marine 18-3668 thermostat kit is specifically designed for the Mercruiser Mercury 807252t4 engine. This kit is essential for maintaining optimal engine temperature and cooling system performance. Let's explore the pros and cons of investing in this thermostat kit.

1. Enhanced Cooling Efficiency: The thermostat kit ensures the engine stays at the ideal operating temperature, which results in improved cooling efficiency and better fuel economy.

2. Long-lasting Construction: The Sierra Marine thermostat is made from high-quality materials, making it more durable than standard OEM thermostats.

3. Easy Installation: The thermostat kit comes with all necessary mounting hardware and step-by-step instructions, making installation a relatively straightforward process.

4. Improved Engine Protection: Proper engine temperature regulation provided by the thermostat kit helps protect the engine from damage caused by overheating or freezing.

5. Better Engine Performance: A well-functioning cooling system can lead to better overall engine performance, including increased horsepower and torque.

1. Cost: The Sierra Marine 18-3668 thermostat kit is priced higher than some OEM and aftermarket alternatives, which may deter some budget-conscious consumers.

2. Potential Fitting Issues: Although designed for the Mercruiser Mercury 807252t4 engine, some users have reported fitment issues, so it's essential to ensure compatibility before making a purchase.

3. Limited Availability: This thermostat kit may not be as widely available in stores as other popular brands, making it necessary to order online or from specialty retailers.

The Sierra Marine 18-3668 thermostat kit for the Mercruiser Mercury 807252t4 engine offers numerous advantages, including enhanced cooling efficiency, long-lasting construction, easy installation, improved engine protection, and better engine performance. However, it comes with a higher price tag and potential fitting issues that some consumers may find concerning. Ultimately, the decision to invest in this thermostat kit depends on your budget, engine cooling needs, and ability to overcome any potential fitment challenges.

If you prioritize cooling efficiency, engine protection, and durability, the Sierra Marine 18-3668 thermostat kit is a solid investment for your Mercruiser Mercury 807252t4 engine. However, if budget constraints are a concern, or if you're unsure about potential fitment issues, consider exploring alternative OEM or aftermarket thermostat options before making a final decision.

Details:

ONCE Purchased YOU OWN IT. Or any other minor issue that does not make the part you are buying DEFECTIVE. They may have been in storage anywhere from 1-30 years. Shipping:: Free Shipping is for continental USA only.

If any manufacturer warranty exists, it is between you and them. Sierra Marine Parts part number 18-3668. There may be minor corrosion, scuffs, torn or missing boxes, scratches from storage, etc. Replaces Mercruiser: 807252T4, 8072.

Be sure the part you are buying is correct for your application. None of which makes the part Defective. Rubber parts, gaskets, hardware may need to be replaced and not usable. Sometimes the fitment is so old that it does not take into account trim, engine size or build dates.

part #: 183668 prices

• $13.50-$25.16

specifications perwatercraft:

• for models: Mercruiser
• for makes: Mercury
• brand: Sierra Marine Parts
• mpn: 18-3668
• part type: Thermostat
• ipn: 807252t4
• upc: 030999316318

returns perwatercraft:

• policy: Returns Accepted
• paid by: Seller
• time: 30 Days

payments perwatercraft:

• wallet: Paypal
• other
• credit card: Discover

offer perwatercraft:

• sold: 0
• availability: In Stock
• quantity: 6
• started: February 5, 2026
• options: Ship-to-home

general perwatercraft:

• condition: New
• Parts Accessories > Personal Watercraft Parts > Other Parts

seller perwatercraft:

• # reviews: 267494
• city: Houston, Texas
• rating: 99.7%

shipping perwatercraft:

• transit: 4-7 Days
• carrier: USPS
• type: Fixed
• cost: $0.00
• class: Standard
• service: USPS Ground Advantage

Sierra Marine Parts 18-3668 Is Similar To:

• Sierra International Llc 18-3782 Marine Propeller Nuts (35.9% similar) Quantity: sold individually. Part type: Marine propeller nuts supplier number. Sierra Marine propeller nuts 18-3782. Nut material: brass. Nylon insert: no. Free within the continental us. Upc: nut finish: natural. Nut style: castle. Manufacturers part number: 18-3782...(January 19th, 2025)
• Sierra Marine Parts 18-3211 Impeller Repair Kit For Johnson Evinrude Va4 V6 Seadrive (53.2% similar) Rubber Parts, gaskets, hardware may need to be replaced and not usable. They may have been in storage anywhere from 1-30 years. Sometimes the fitment is so old that it does not take into account trim, engine size or build dates. If any manufacturer warranty exists, it is between you and them...(October 20th, 2025)
• Sierra 18-3661 Sierra volvo Penta Thermostat Kit Nos Oem Sku M-19-46 (46.5% similar) The 18-3661 Sierra/Volvo pent thermostat kit is a genuine oem part made by Sierra specifically for personal watercraft. With a manufacturer part number of 18-3661, this product provides reliable solution for maintaining and repairing your watercraft's cooling system. While this product does not...(December 7th, 2025)
• Carbhub 95271190 2pcs Windshield Wiper Arm Cap Cover Fit For Encore Silverado Sierra Y (28.8% similar) Fit for Chevrolet Cheyenne 2007 -2016, Silverado 1500 2007 -2017, 2500 3500 Tahoe MK3 2007 -2014, traverse 2011 -2017. Carb hub 2PCS windshield wiper arm cap cover fit for encore Silverado Sierra Yukon replace 95271190: part number: 95271190. Fit for GMC Acadia 2011 -2017, Sierra 1500 2007 -2017, 2500...(March 14th, 2026)