My Account
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order

Sierra 18-1989K Thermostat Housing Service Kit for Mercruiser Marine Engines

Manufacturer

Picture for manufacturer Sierra

Part Number

118-1989K
5 reviews
Sale Price

$14.14

2 left at this price

delivery box

Usually delivered within 2 days

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 18-1989K is a comprehensive thermostat housing service kit designed specifically for late model MerCruiser marine engines. This complete kit provides all the necessary gaskets and components required for servicing Sierra 18-1989 thermostat housings.

Kit Includes:

  • Thermostat housing sleeve (replaces MerCruiser 23-806922)
  • Gasket 18-2917 for secure thermostat housing seal
  • Gasket 18-2844 for thermostat cover
  • Gasket 18-2554 for additional sealing

Key Features:

  • Engineered to meet or exceed OEM specifications for reliable performance
  • Designed for MerCruiser V-6 and V-8 GM inboard and sterndrive engines
  • Premium-quality aftermarket replacement components
  • Built to withstand harsh marine environments
  • Complete service solution for one-step thermostat housing maintenance

Sierra is a trusted manufacturer of over 6,000 marine replacement parts, providing boaters with dependable components that deliver long-lasting durability and performance. This service kit ensures proper sealing and optimal cooling system function when servicing your MerCruiser thermostat housing.

Anxiously awaiting my order

best price for a propeller on the internet and shipping was fast. happy customer

great pricing

Fast and friendly website experience with excellent prices!

Quick and as promised. Exactly what I ordered.

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