Engineered Marine Products 75-75512 Thermostat Kit for Mercury Outboard 3-4 Cylinder

The Engineered Marine Products 75-75512 Thermostat Kit is designed for Mercury and Mariner outboard engines with 3-cylinder and 4-cylinder inline configurations ranging from 70 to 125 horsepower. This complete kit maintains proper engine operating temperature by regulating coolant flow, preventing both overheating and overcooling conditions that can reduce engine performance and longevity.

Key Features:

• 120-degree Fahrenheit operating temperature for optimal engine performance
• Fits Mercury/Mariner 3-cylinder: 70, 75, 80, and 90 HP models (specific serial numbers apply)
• Fits Mercury/Mariner 4-cylinder: 100, 115, and 125 HP models (specific serial numbers apply)
• Complete kit includes thermostat and necessary gaskets for installation
• Direct replacement for OEM Mercury part number 803061T1
• Also replaces Sierra 18-3569 and GLM 13124 aftermarket part numbers
• Precision-engineered to meet or exceed OEM specifications

This thermostat kit is essential for maintaining the cooling system efficiency in Mercury and Mariner outboards manufactured from 1987 to 1998. Proper thermostat function ensures your engine reaches optimal operating temperature quickly while preventing damage from overheating during operation. Regular thermostat replacement is a critical part of outboard engine maintenance.