Keep your marine engine operating at the correct temperature with the Indmar 491010 Thermostat Kit. Designed as a genuine OEM replacement, this complete thermostat service kit helps maintain proper coolant flow and reliable cooling system performance in demanding marine conditions.
The thermostat is responsible for regulating coolant circulation through the engine, allowing the engine to warm up properly while preventing overheating under load. Over time, thermostats can stick, wear out, or lose accuracy due to heat cycles and corrosion exposure. Replacing the thermostat and related sealing components helps restore stable engine temperatures and dependable performance on the water.
The Indmar 491010 kit is built to factory specifications and includes the components needed for a proper thermostat service. Designed for direct-fit installation, it provides reliable operation and long-term durability in both freshwater and closed-cooling marine applications.
The Indmar 491010 thermostat kit is commonly used on GM-based Indmar marine engines, including:
These engines are frequently found in:
The 491010 thermostat kit is commonly used during cooling system maintenance and thermostat replacement service to help maintain consistent engine operating temperatures.
Fitment may vary depending on engine serial number and thermostat housing configuration, so confirming compatibility with part number 491010 before ordering is recommended.
Depending on production revision, the kit may include:
Contents may vary slightly by production batch.
A failing thermostat can cause overheating, unstable temperatures, or reduced engine efficiency. Replacing the thermostat and sealing components together helps restore proper cooling system operation and reduces the risk of coolant leaks or premature component wear.
If you’re servicing an Indmar-powered Supra, Moomba, Malibu, or MasterCraft, the 491010 thermostat kit delivers the OEM-quality fit and dependable cooling performance your engine was designed for.
