18-1989 Thermostat-Merc SS Housing Kit
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Stainless steel resists corrosion and is ideal for thermostat housings
The engine’s cooling system components take a beating. Constantly heat cycled and exposed to salt water and fresh water, these parts corrode at a much faster rate than other engine parts. Stainless steel is a great material to stand up to this abuse and will provide a longer service life. Sierra thermostat housings are engineered to match OEM housings to ensure technicians and boaters the fit and function will be to factory specifications. Each kit includes the necessary gaskets, plugs and spacers to complete the installation (see the instructions below to determine the correct spacer for your application).
Key Features
- Stainless steel construction resists corrosion
- Engineered to OEM specifications for fit and function within factory specifications
- Kit includes housing, plugs, gaskets, and spacers required to complete installation
- Backed by SeaStar Solutions Limited Two-Year Warranty
Sierra Part Number 18-1989 Application Table
| Application | OEM Part Number |
|---|---|
| Mallory | 9-42500 |
| MerCruiser Sterndrive | 861006A1, 8M0061381 |
The Sierra Engine Parts Selector
In addition to thermostat housings, we offer a wide variety of other engine parts manufactured by Sierra. To see if we have the part you need, see our Engine Parts Selector, where you can search by engine make, serial number and model or year of manufacture.
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