Thermostat w/Housing 143°F 62°C For Mercury 135-400HP Outboard 18-3631 8M0174561

Thermostat with Housing for Mercury

This thermostat with housing is a direct replacement for Mercury outboard engines, regulating coolant temperature at 143°F (62°C) to maintain optimal operating conditions. It references OEM cross-reference numbers 18-3631 and 8M0174561.

Overview

Designed for Mercury outboards in the 135-400HP range, this thermostat with housing ensures the engine operates at the correct temperature. It prevents overheating and promotes efficient fuel combustion. This thermostat with housing is a reliable component for maintaining peak engine performance.

Built For Performance

• Precise temperature regulation at 143°F (62°C)
• Corrosion-resistant construction for marine environments
• Integrated housing simplifies installation and replacement
• Meets OEM specifications for reliable operation
• Durable design withstands high operating pressures

On-The-Job Use

• For maintaining engine temperature during extended cruising
• For preventing overheating in high-horsepower outboards
• For ensuring consistent performance in saltwater and freshwater
• For replacing faulty thermostats in outboard cooling systems

Specs At A Glance

Good To Know

Q: Will this thermostat with housing work on any Mercury outboard? A: It is designed for Mercury outboards in the 135-400HP range, but always verify compatibility with your specific engine model and serial number.

Q: What does the housing do? A: The housing provides a secure mount and directs coolant flow, ensuring the thermostat operates correctly and simplifies the installation process.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.