Mercury Thermostat Kit, 140°F (MerCruiser Inline 4 & 6-Cylinder) 59078T3

Mercury Thermostat Kit, 140°F (MerCruiser Inline 4 & 6-Cylinder) 59078T3 is a genuine Mercury/Quicksilver OEM replacement kit designed for older General Motors-based MerCruiser inline 4-cylinder and 6-cylinder engines. A properly functioning thermostat helps maintain the correct engine operating temperature for dependable cooling system performance and efficient engine operation.

Compatible with the following:

• Older GM-based MerCruiser inline 4-cylinder engines
• Older GM-based MerCruiser inline 6-cylinder engines

This complete thermostat kit includes the replacement 140°F thermostat and cork gasket needed for routine cooling system service. Replacing the gasket during installation helps ensure a proper seal and reliable cooling system operation.

Kit Includes:

• 140°F thermostat
• Cork thermostat gasket

Always install the thermostat temperature specified in your owner's or service manual. Using genuine Mercury replacement parts helps ensure proper fit, dependable operation, and long-term cooling system reliability.

Quicksilver is Mercury Marine's official parts and accessories brand, offering the same OEM quality and fit as Mercury-branded components.

To Confirm Compatibility: Contact our team with your engine serial number at (727) 596-5929 before ordering.