Yamaha - Thermostat Cover - Cooling System Component - 6L5-12413-00-1S

Overview

The thermostat cover isn’t something you think about often, but when it starts leaking or warping, it can mess with your cooling system fast. I’ve seen small leaks here turn into bigger overheating issues if they’re ignored. This is one of those simple parts that keeps everything sealed and functioning the way it should. Swap it out when needed, and you avoid a lot of unnecessary trouble down the line.

Key Features

• Secure Thermostat Housing Seal – Keeps the thermostat properly enclosed to maintain cooling system pressure.
• Corrosion-Resistant Construction – Built to handle constant exposure to water and marine conditions.
• Factory-Spec Fitment – Designed to match Yamaha components for proper alignment and sealing.
• Leak Prevention Design – Helps eliminate coolant leaks that can affect engine temperature.
• Essential Maintenance Component – Ideal for replacing worn or damaged covers during service.

Engine & Boat Compatibility

Designed for Yamaha outboard engines with compatible cooling system setups. Commonly used across small to mid-range outboards on fishing boats, skiffs, and utility vessels. Always confirm part number compatibility before installation.

FAQ

Q: What are signs this cover needs replacing?
A: Visible leaks, corrosion, or warping around the sealing surface are common signs.

Q: Can a bad thermostat cover cause overheating?
A: Yes, if it leaks or doesn’t seal properly, it can affect cooling system pressure and performance.

Q: Should I replace the gasket at the same time?
A: Always—it’s best to install a new gasket to ensure a proper seal.

Q: Is installation difficult?
A: It’s usually straightforward, just make sure surfaces are clean and bolts are evenly tightened.

Q: Is this part still current?
A: This part has been superseded by a newer version, which may include updated design improvements.

• Supersessions
  6GE-E2413-00-1S, 6GE-E2413-00-1S, 6L5-12413-00-9M