Yamaha - Thermostat Cover - Cooling System Component - 6DA-12413-A0-9S

Overview

This thermostat cover is one of those simple pieces that plays a big role in keeping your cooling system sealed and working the way it should. It holds everything in place around the thermostat and keeps water flowing where it needs to go. When these covers start to warp or corrode, you’ll usually see it in leaks or inconsistent engine temps. Swap it out, and you’re back to steady cooling and peace of mind on the water.

Key Features

• Secure Thermostat Housing – Keeps the thermostat properly seated for consistent engine temperature control.
• Leak Prevention Design – Helps maintain a tight seal to prevent water or coolant loss.
• OEM Fitment – Built to Yamaha specifications for proper alignment and easy installation.
• Corrosion-Resistant Build – Designed to handle harsh marine environments over time.

Engine & Boat Compatibility

Designed for Yamaha outboards using thermostat-regulated cooling systems. Commonly used across modern engines where proper temperature control is critical for performance and engine longevity. Suitable for both freshwater and saltwater applications with routine maintenance.

FAQ

Q: What are signs this thermostat cover needs to be replaced?
A: Look for water leaks around the housing, corrosion buildup, or inconsistent engine temperature readings.

Q: Should I replace the gasket when installing a new cover?
A: Yes, always use a new gasket to ensure a proper seal and avoid future leaks.

Q: Can a bad cover affect engine temperature?
A: It can. If it doesn’t seal correctly, it may disrupt proper water flow through the cooling system.

Q: How does saltwater use impact this part?
A: Salt can cause corrosion over time, especially if the engine isn’t flushed regularly after use.

Q: Is installation straightforward?
A: It’s a simple job for most DIYers—just make sure surfaces are clean and bolts are tightened evenly.

• Supersessions
  6DA-12413-00-9S