Thermostat Kit for Mercury 6, 8, 9.9, 15, 20, 25 hp 120° 14586A3 18-3549

Thermostat Kit for Mercury

This thermostat kit regulates engine temperature for Mercury outboards, replacing OEM part numbers 14586A3 and 18-3549.

Overview

The thermostat kit for Mercury outboards ensures the engine warms up quickly and maintains optimal operating temperature. This replacement kit is designed for Mercury 6, 8, 9.9, 15, 20, and 25 hp outboards, providing a direct fit for specified models. Each kit includes the thermostat and necessary gaskets for a complete overhaul.

Built For Performance

• Precision thermostat opens at 120°F for consistent cooling
• High-quality materials resist corrosion in saltwater environments
• Direct replacement for OEM part numbers 14586A3 and 18-3549
• Includes all necessary components for installation
• Compatible with a range of Mercury outboards from 6 to 25 hp

On-The-Job Use

• Maintains proper engine temperature during long trolling sessions
• Ensures reliable performance in freshwater or saltwater
• Essential for routine maintenance of small outboard motors
• Helps prevent overheating and engine damage

Specs At A Glance

Good To Know

Q: What does this thermostat kit do? A: It controls the flow of coolant through the engine, helping it reach and maintain the correct temperature for efficient combustion.

Q: Is this an original Mercury part? A: No, it is an aftermarket replacement designed to match original specifications and fitment.

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