Yamaha - Thermostat Cover - Cooling System Housing - 6E9-12413-00-1S

Overview

Thermostat covers don’t seem like much until you’ve got a leak or temperature issue to track down. I’ve seen engines run hotter than they should just because this cover wasn’t sealing right. It holds everything together around the thermostat and keeps water flowing where it needs to go. When it’s in good shape, the cooling system stays consistent and you don’t have to think twice about it.

Key Features

• Secure Thermostat Housing – Keeps the thermostat properly positioned for consistent cooling performance.
• Leak Prevention Design – Helps maintain a tight seal to prevent water loss.
• Durable Construction – Built to handle engine heat and continuous water exposure.
• Proper Water Flow Routing – Supports efficient circulation through the cooling system.
• Exact Yamaha Fitment – Matches factory specifications for proper alignment and installation.

Engine & Boat Compatibility

Designed for Yamaha outboard engines utilizing thermostat-controlled cooling systems. Commonly used across small to mid-range Yamaha outboards in recreational and utility boats. Suitable for freshwater and saltwater environments where reliable temperature regulation is essential.

FAQ

Q: What are signs this thermostat cover needs replacing?
A: Water leaks, corrosion, or uneven sealing around the housing are common indicators.

Q: Should I replace the gasket when installing this cover?
A: Yes, always install a new gasket or seal to ensure a proper fit.

Q: Any tips for installing this cover?
A: Clean the mating surfaces and tighten bolts evenly to avoid warping.

Q: How does saltwater affect this part?
A: Corrosion can build up over time, so regular flushing and inspection help extend its life.

Q: Can a bad thermostat cover cause overheating?
A: Yes, improper sealing can disrupt water flow and lead to temperature issues.

• Supersessions
  6E9-12413-00-9M