Mercury 15/20 HP EFI FourStroke Thermostat 8M0139434

Mercury Thermostat 8M0139434 is sold under the Quicksilver brand, Mercury Marine's line of replacement parts and accessories. This replacement thermostat is designed for select Mercury 15 HP and 20 HP EFI FourStroke engines.

Compatible with the following:

• Mercury 15 HP EFI FourStroke
• Mercury 20 HP EFI FourStroke

The thermostat regulates cooling-water flow based on engine temperature, helping the engine warm up properly and maintain its designed operating temperature. A thermostat that becomes corroded, damaged, or stuck open or closed can contribute to improper operating temperatures and cooling-system problems.

This thermostat is a direct replacement for the original component in compatible Mercury 15/20 HP EFI FourStroke cooling systems. Related gaskets and seals should be inspected during thermostat service and replaced as necessary.

Because fitment can vary by engine production range, compatibility should be confirmed using the engine serial number before ordering.

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