Sierra 18-3554

Fits 4.3L (All Models), 5.0 FiP, FLP, GiP, GLP, GL, GXi, OSi, 5.7 (All Models Except OSi), & 5.8 (All Models) engines.

Features:

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Maximize engine performance and efficiency by running at the optimum temperature

A failed thermostat can cause an engine to run outside of its optimum temperature adversely affecting performance and efficiency. The fix can be as simple as replacing the thermostat. Sierra thermostats are engineered to meet or exceed the specifications of marine engine manufacturers and have gained the confidence of the marine industry. Boaters and technicians can be assured a Sierra part will fit right the first time and restore function to OEM standards Get the most out of your OMC by running at the right temperature with a Sierra thermostat..

Key Features

• Thermostat meets or exceeds OMC specifications
• Temperature rating of 60°F (71°C)
• Backed by a SeaStar Solutions Two-Year Warranty

How to find the thermostat you need

Select your thermostat by locating the OEM part number in the table below. If you don’t know the OEM part number, please visit our Engine Parts Selector, where you can search by engine make, model, horsepower, serial number and year of manufacturer..

We offer a variety of Sierra engine parts for most engine applications on the water today—including MerCruiser, OMC, Johnson/Evinrude, Volvo and more