Quicksilver 8M0162139 Replacement Thermostat 140°F Marine Outboard

The Quicksilver 8M0162139 is a precision-engineered 140°F replacement thermostat designed specifically for select Mercury 175-300hp and 450R outboard engines with 3.4L V6 and 4.6L V8 4-stroke powerheads (serial number 2B529482 and above). This genuine OEM component ensures your outboard maintains optimal operating temperature for peak performance and fuel efficiency.

Key Features:

• Corrosion-resistant stainless steel construction for extended service life in harsh marine environments
• Self-cleaning design allows contaminants to flush through closing surfaces, preventing buildup
• Precisely calibrated to 140°F for proper cooling system temperature response
• Direct OEM replacement for easy installation with common tools
• Engineered to deliver peak engine performance and maximum efficiency

Application: Compatible with Mercury 175-300hp and 450R outboards featuring 3.4L V6 and 4.6L V8 4-stroke engines (serial number 2B529482 and above). Thermostat only—additional seals or gaskets may be required for installation. Consult your owner's manual or service manual for complete installation instructions and parts requirements.

Regular thermostat maintenance is critical for preventing overheating and ensuring your Mercury outboard runs at its designed temperature range for optimal combustion and longevity.