Yamaha - Thermostat Cover - Cooling System Housing - 688-12413-00-1S

Overview

Cooling systems on Yamaha outboards rely on a few key components working together to regulate engine temperature. The Yamaha Thermostat Cover 688-12413-00-1S protects and seals the thermostat housing so the cooling system can operate the way it should. If a cover becomes corroded or damaged over time, it can lead to leaks or improper sealing around the thermostat assembly. Installing a genuine Yamaha replacement helps keep the cooling system sealed and the engine running at the correct temperature.

Key Features

• Thermostat Housing Protection – Covers and protects the thermostat assembly within the engine’s cooling system.

• OEM Yamaha Precision Fit – Manufactured to Yamaha specifications to ensure proper alignment and sealing.

• Cooling System Integrity – Helps maintain proper coolant flow and temperature regulation inside the engine.

• Durable Marine Construction – Built to withstand heat cycles, vibration, and harsh marine environments.

• Direct Replacement Component – Installs in place of the original thermostat cover without modification.

Engine & Boat Compatibility

Compatible with select Yamaha outboard engines that utilize this style of thermostat cover within the cooling system.

Refer to manufacturer fitment information to confirm compatibility with your specific Yamaha engine model.

FAQ

Q: What does a thermostat cover do on a Yamaha outboard?
A: It encloses and protects the thermostat assembly while sealing the cooling system housing.

Q: Can a damaged thermostat cover cause cooling issues?
A: Yes. Cracks or corrosion can lead to leaks that affect the engine’s ability to regulate temperature.

Q: Should the cover be replaced during thermostat service?
A: If the cover shows corrosion, warping, or sealing damage, replacement is recommended during service.

Q: Is this part exposed to water inside the engine?
A: Yes. It is part of the cooling system and experiences constant heat and water flow.

Q: Is installation complicated?
A: No. It is typically a straightforward replacement during thermostat or cooling system maintenance.

• Supersessions
  688-12413-00-9M, 688-12413-00-8D