Mercury Thermostat Housing 879194187

Mercury Thermostat Housing 879194187 is an OEM replacement cooling system component for select Cummins MerCruiser Diesel (CMD) QSD 2.8L and 4.2L engines. Mercury parts listings identify this part specifically as the thermostat housing, rather than the thermostat valve itself.

Compatible with select applications including:

• CMD QSD 2.8L 170
• CMD QSD 2.8L 210
• CMD QSD 2.8L 220
• CMD QSD 2.8L 230
• CMD QSD 4.2L 270
• CMD QSD 4.2L 320
• CMD QSD 4.2L 350

The thermostat housing is part of the engine cooling system and provides the housing for the thermostat valve and related cooling components. Maintaining the correct cooling system components helps regulate engine temperature and coolant circulation during operation.

This listing is for the thermostat housing. The thermostat valve is a separate component in the cooling system assembly.

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