Mercury Thermostat Kit, 140°F (MerCruiser 4 & 6-Cylinder) 59078Q3

Mercury Thermostat Kit, 140°F (MerCruiser 4 & 6-Cylinder) 59078Q3 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 regulate engine operating temperature for dependable cooling system performance.

Compatible with the following:

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

This 140°F thermostat kit includes the replacement thermostat and cork gasket needed for routine cooling system service. Replacing a thermostat that is stuck open or closed can help restore proper engine temperature, improve performance, and reduce unnecessary engine wear.

Kit Includes:

• 140°F thermostat
• Cork thermostat gasket

Using genuine Mercury replacement parts helps ensure proper fit and reliable operation. Always follow the procedures and thermostat specifications outlined in your owner's or service manual during installation.

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