Your Cart

Sierra 18-3642 Thermostat Kit for Mercury Marine 25-40 HP Outboards

Manufacturer

Sierra

Picture for manufacturer Sierra

Part Number

18-3642
6 reviews
04/21/2036 3:42 PM
Sale Price

$37.00

In Stock (10+)

delivery box

Usually delivered within 2 days

Add To Cart

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 18-3642 Thermostat Kit is an OE replacement thermostat assembly designed for Mercury Marine outboard engines ranging from 25 to 40 horsepower. This kit ensures proper engine temperature regulation, helping prevent overheating and maintaining optimal operating conditions for your outboard motor.

Key Features:

  • Direct OE replacement for Mercury Marine outboard engines
  • Fits 25 HP through 40 HP Mercury outboards
  • Includes thermostat and gasket for complete installation
  • Helps maintain proper engine operating temperature
  • Quality marine-grade construction for saltwater and freshwater use

This thermostat kit is an essential maintenance component that helps protect your outboard engine from temperature-related damage. Regular thermostat replacement is recommended as part of routine engine maintenance to ensure reliable performance and longevity.

no problems.. easy to do..

very pleased with information about the part I needed

More ratings of customer long term experience with product would help with buying confidence. Rec'd. product: the finish on the chrome/steel Curt 22110 hitch cover is not as smooth as expected for a brand new product; looks like the surface preparation before chroming was inadequate. There are pits in the metal that show in the finish.

Was a little complicated for the amauteur auto guy

first time they sent the wrong part and still waiting to get a refund

Great and Easy to Use Website

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