Quicksilver Thermostat 140 Degrees (V6 & V8 175hp-450R) 8M0162139

The Quicksilver Thermostat (140 Degree) for 3.4L V6 & 4.6L V8 FourStroke Outboards 8M0162139 is a genuine Quicksilver OEM replacement thermostat designed for select Mercury FourStroke outboards.

Compatible With:

• Mercury 175HP-300HP 3.4L V6 FourStroke outboards
• Mercury 4.6L V8 FourStroke outboards
• Mercury Racing 450R outboards
• Serial number 2B529482 and newer

This 140°F thermostat helps regulate engine operating temperature to maintain proper cooling system performance and engine efficiency. The corrosion-resistant stainless steel construction provides long service life, while the self-cleaning design helps allow cooling system contaminants to pass through the sealing surfaces.

Proper thermostat operation is essential for maintaining peak engine performance, fuel efficiency, and consistent cooling system operation. Additional seals or gaskets may be required depending on your application. Refer to your owner's or service manual for replacement procedures and installation information.

Genuine Quicksilver parts are manufactured to Mercury Marine specifications to help ensure proper fitment, dependable performance, and compatibility compared to aftermarket alternatives.

To confirm compatibility, contact our team with your engine serial number at (727) 596-5929 before ordering.