BRP / OMC 18-3544 Thermostat 435491 75-175

( Brand: Brp / Omc ), ( Manufacturer Part Number: 18-3544 ), ( Part Type: Hp Thermostat ), ( Non-domestic Product: Yes ), ( Custom Bundle: No ), ( Country Of Origin: United States )

Review BRP / OMC Thermostat Pair Replaces 75-175 Hp Evinrude Johnson fits SIERRA

The OMC (Outboard Marine Corporation) 18-3544 thermostat is specifically designed for use with Evinrude Johnson engines, model Sierra with the part number 435491. This thermostat is suitable for engines with a horsepower rating between 75 and 175.

The OMC 18-3544 thermostat is an essential component of your engine cooling system. It is engineered to maintain an optimal engine temperature for efficient and reliable engine performance. The thermostat features a durable, corrosion-resistant housing made of high-quality materials, ensuring longevity even in harsh marine environments.

The thermostat operates using a temperature-sensitive valve that opens and closes based on engine temperature. When the engine is cold, the valve remains closed, preventing coolant from flowing through the cooling system and keeping the engine warm to expedite the warming process. Once the engine reaches its optimal operating temperature, the valve opens, allowing coolant to circulate through the engine and cooling system, maintaining a consistent temperature.

This OMC 18-3544 thermostat is designed to fit seamlessly into your Evinrude Johnson Sierra engine. Its precise engineering and manufacturing ensure a perfect fit and reliable performance. The thermostat also comes with clear installation instructions to make the replacement process as straightforward as possible.

In summary, the OMC 18-3544 thermostat is a high-quality, corrosion-resistant component designed for use with Evinrude Johnson Sierra engines (435491, 75-175 hp). It maintains optimal engine temperature for efficient and reliable performance and is easy to install.

title: Pros and Cons of Buying OMC 18-3544 Thermostat for Evinrude Johnson 75-175 HP Engines

The OMC 18-3544 thermostat is a popular choice for Evinrude Johnson engines with a horsepower range of 75-175. This thermostat is designed to maintain an optimal engine temperature, improving performance and longevity. In this article, we will discuss the pros and cons of purchasing a OMC 18-3544 thermostat for your Evinrude Johnson engine.

1. Improved Engine Performance: A properly functioning thermostat ensures that the coolant circulates effectively throughout the engine. This results in consistent engine temperature, which in turn leads to improved performance.

2. Longer Engine Life: By maintaining an optimal engine temperature, the OMC 18-3544 thermostat helps to prevent overheating and cooling, which are common causes of engine damage.

3. Easy Installation: The thermostat is designed to be a straightforward installation process for most DIYers. It typically involves draining the coolant, removing the old thermostat, and installing the new one.

4. Durable Construction: The OMC 18-3544 thermostat is made from high-quality materials, ensuring that it can withstand the rigors of frequent use on the water.

5. Temperature Consistency: The thermostat is designed to maintain a consistent engine temperature, which is essential for optimal engine performance and longevity.

1. Cost: Compared to some aftermarket options, the OMC 18-3544 thermostat can be more expensive. However, its durability and performance make it a worthwhile investment for many boat owners.

2. Availability: Depending on the location and availability, it may be more challenging to find this specific thermostat model in local boat parts stores. In such cases, online retailers may be the best option.

3. Cooling System Maintenance: While the thermostat itself is a relatively simple component, maintaining the cooling system as a whole is essential. Regular inspections and coolant changes are necessary to ensure optimal performance and longevity.

The OMC 18-3544 thermostat is a worthwhile investment for Evinrude Johnson engine owners seeking to improve engine performance and longevity. Its durability, ease of installation, and temperature consistency make it an excellent choice for boaters who want a reliable cooling system. While the cost may be a concern for some, the long-term benefits make it an investment worth making.

If you are in the market for a new thermostat for your Evinrude Johnson engine, the OMC 18-3544 thermostat is an excellent choice. Its proven performance, ease of installation, and durability make it a worthwhile investment for boaters looking to keep their engines running at their best. While the cost may be higher than some aftermarket options, the peace of mind that comes with a high-quality OEM part is well worth the investment.

Details:

These are not imported thermostats of questionable quality. Brand: Sierra, Made in the USA. Why take a chance of engine overheating due to faulty thermostat. Sierra PN 18-3544 List $ 41.40 BRP 435491 40.72, 1/2 Once of grease free, MSR total 82.80, Shipping: FREE lower 48 states, 10.25 Hi Ak.

THERMOSTATS PAIR 3/22, EVINRUDE JOHNSON. New in sealed package.

part #: 183544 prices

• $13.40-$15.99

specifications exhaussyste:

• for models: Sierra
• for makes: Evinrude, Johnson
• brand: Brp / Omc
• mpn: 18-3544
• part type: Hp Thermostat
• non-domestic product: Yes
• custom bundle: No
• country of origin: United States

shipping exhaussyste:

• carrier: UPS
• service: UPS Ground
• class: Standard
• cost: $0.00
• type: Fixed
• transit: 5-11 Days

returns exhaussyste:

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

offer exhaussyste:

• availability: In Stock
• sold: 0
• quantity: 1
• started: April 14, 2026
• options: Ship-to-home

payments exhaussyste:

• credit card: Mastercard
• other
• wallet: Google-pay

general exhaussyste:

• Boat Parts > Inboard Engines Components > Exhaust Systems
• condition: New

seller exhaussyste:

• rating: 100.0%
• city: Lake Worth, Florida
• # reviews: 2976

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