Sierra Qualifies for Free Shipping Sierra Thermostat Mercury 175-300 HP #18-36140

Sierra Thermostat Mercury 175-300 HP #18-36140

$112.45 $139.59 -20% OFF

Sierra Thermostat Mercury 175-300 HP #18-36140

$112.45 $139.59 -20% OFF

Sierra Thermostat Mercury 175-300 HP #18-36140

$112.45 $139.59 -20% OFF
🔍
Engine Parts Finder
Locate Sierra engine parts that fit your engine/drive quickly & easily. Launch the Engine Parts Finder →
Brand: Sierra

SKU: SIE-18-36140

UPC: 808282391744

More about this item

Sierra 18-36140 Thermostats & Parts

The Sierra 18-36140 is a precision-engineered thermostat designed specifically for Mercury outboard engines ranging from 175 to 300 horsepower. This critical cooling system component regulates engine operating temperature, ensuring your engine runs at optimal temperature for maximum performance, fuel efficiency, and longevity.

The thermostat controls coolant flow through your engine's cooling system by opening and closing in response to temperature changes. When the engine is cold, the thermostat remains closed, allowing the engine to warm up quickly to its optimal operating temperature. Once the engine reaches the proper temperature, the thermostat opens to allow coolant circulation, maintaining consistent engine temperature and preventing overheating.

Manufactured to meet or exceed OEM specifications, this Sierra thermostat features quality construction designed to provide reliable, accurate temperature control throughout its service life. A properly functioning thermostat is essential for preventing engine damage from overheating, reducing excessive wear from running too cold, maintaining proper fuel mixture and combustion efficiency, and ensuring optimal engine performance across all operating conditions.

A faulty thermostat can cause serious problems including overheating, poor fuel economy, increased emissions, reduced power output, and accelerated engine wear. Common signs of thermostat failure include engine running too hot or too cold, temperature fluctuations, poor heater performance, and coolant leaks. Regular inspection and replacement of thermostats during routine maintenance helps prevent these issues and ensures your engine operates at peak efficiency.

Designed specifically for Mercury 175-300 HP engines, this thermostat ensures proper fit and function for your specific engine model. Whether you're performing scheduled maintenance or replacing a failed thermostat, this Sierra component provides the quality and reliability needed to keep your high-performance engine running at optimal temperature.

Compatibility:

  • Mercury outboard engines: 175-300 HP
  • Meets or exceeds OEM specifications
  • Precision temperature control
  • Essential for optimal engine performance
  • Prevents overheating and excessive wear
  • Designed for high-performance engines

Interchange:

Mercury Marine    8M0137816
Mercury Marine    8M0162139

Normalized SKU: 1836140
UPC Code: 808282391744

Qualifies for Free Shipping
This item qualifies for free shipping when the order is over $149
$112.45 $139.59 -20% OFF
0 watching this item.
0 LEFT IN STOCK
LIMITED TIME OFFER 00
days
00
hours
00
minutes
00
seconds

The price of this item will revert back to $139.59 at the end of this countdown.

Customer Reviews

Frequently Asked Questions

First Choice Marine is an online marine retailer offering a wide variety of marine parts and accessories from reputable manufacturers. With access to over 150,000 items through our distributor network, including current inventory, new products, and special orders, we are your go-to source!

Yes, we offer FREE Shipping on most orders over $149 to US-48*.

Each product displays a shipping status message, just above the item price. Below is the meaning for each of these codes.

  • Qualifies for Free Shipping: This item qualifies for free shipping when the order is $149+
  • Qualifies for Free Ground Shipping: This item qualifies for free ground shipping when the order is $149+.
  • Oversized - Not Qualified for Free Shipping: This item is too large/heavy to qualify for free shipping
  • Hazardous Item - Not Qualified for Free Shipping: This item is hazardous and does not qualify for free shipping
  • Truck Freight - Not Qualified for Free Shipping: This item has to be shipped via truck freight. Please contact us for a quote
  • In-Store Pickup Only: This item can only be picked up in our Grain Valley, MO retail store

Below the price of the item, on the product page, there is a message indicating the availability of the product.

The quantity on hand is updated as inventory events happen and matches what we have available. If you have urgent needs and we are close to what you need, contact us, and we can confirm stock.

We offer a hassle-free return policy. If you're not completely satisfied with your purchase, you can return it within 30 days for a full refund or exchange.

If you need to return an item, please follow the guidelines here so we can process a prompt refund and assist you in finding the correct item.

Free Shipping

On most orders $149+ to the continental 48 US states.

Secure Shopping

Fast, secure checkout with a variety of payment methods.

Shop with confidence

25+ years serving the marine industry.

Support center

Need help? Contact us via live chat, phone, or email.