My Account
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order

Sierra 18-3633 Replacement Thermostat for Mercury Marine Outboards

Manufacturer

Picture for manufacturer Sierra

Part Number

118-3633
6 reviews
Sale Price

$77.17

In Stock (10+)

delivery box

Usually delivered within 2 days

free shipping

FREE SHIPPING

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Sierra 18-3633 is a high-quality replacement thermostat designed for Mercury Marine outboard engines. This aftermarket thermostat delivers reliable performance and precise temperature regulation to keep your engine running at optimal operating temperature.

Key Features:

  • Direct replacement for Mercury Marine OEM part number 8M0090819
  • Fits Mercury 75-115HP outboards (serial number 2B094996 and higher)
  • Compatible with Mercury 115 Pro XS models
  • Meets or exceeds original equipment specifications
  • Precision-engineered for proper cooling system operation

Sierra Marine is known for producing quality replacement parts that provide reliable performance at a great value. This thermostat ensures your Mercury outboard maintains proper operating temperature, protecting your engine from overheating damage while optimizing fuel efficiency and performance.

I think the shopping experience was great. Now we will see how the shipping experience is! Thank you. I wish we could’ve had a coupon or a discount with this purchase. Maybe you could let us know if we can get one for this purchase?

They came perfectly

Quick and easy. Conversation with rep was easy and quick as well.

Quick shipment!

Great!

Seamless

Share icon
Return Policy
Returns are easy at Boatplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy