Mercruiser Stainless Steel Thermostat Housing | Sierra 18-1989
Mercruiser Stainless Steel Thermostat Housing | Sierra 18-1989
Sierra
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Mercruiser Stainless Steel Thermostat Housing | Sierra 18-1989
Stainless thermostat housing fits various Mercruiser GM 4.3L, 5.7L, 7.4L and 8.2L marine engines.
- Fits various Mercruiser GM 4.3L, 5.7L, 7.4L and 8.2L applications
- Stainless steel construction
- Includes inserts, pipe plugs & thermostat gasket
- Uses Sierra 18-1989K gasket service kit
- Replaces Mercury 87290A4, 8M0061381, & 861006A1
! Compatibility references are provided for informational purposes only and do not constitute a fitment guarantee. Part numbers, application listings, and "replaces" cross-references are based on manufacturer data and are intended as a starting point for identification — not a guarantee of fit for your specific engine, hull, or installation.
Buyer is solely responsible for verifying compatibility with their engine model, serial number, model year, and trim configuration before purchase. If you are unsure whether this part fits your application, contact MacombMarineParts.com before you buy — we're available via text, email, or online chat to help verify compatibility for your specific application.
MacombMarineParts.com is not liable for parts ordered based on assumed fitment. Returns due to buyer-selected incorrect fitment are subject to our standard return and restocking fee policies.