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The Sierra 18-1989K Thermostat Service Kit is a comprehensive replacement kit designed specifically for use with Sierra 18-1989 stainless steel thermostat housings on Mercruiser marine engines. This complete service kit provides all the essential gaskets and components needed to properly maintain and service your engine's thermostat housing assembly.
Kit Includes:
This service kit is engineered to meet or exceed OEM specifications and is designed for late model Mercruiser V6 and V8 engines with one-piece thermostat housings. Sierra marine parts are manufactured to withstand harsh marine environments, ensuring reliable performance and proper sealing for your cooling system. Whether you're performing routine maintenance or rebuilding your thermostat housing, this kit provides all the necessary components for a complete, professional repair.
Anxiously awaiting my order
Presley A
best price for a propeller on the internet and shipping was fast. happy customer
kirbdog
great pricing
Thomas A
Fast and friendly website experience with excellent prices!
William P
Quick and as promised. Exactly what I ordered.
Mike T
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