Yamaha - Thermostat Cover Gasket - Cooling System - F150 LF150 - 63P-12414-00-00

Overview

The Yamaha 63P-12414-00-00 Thermostat Cover Gasket is designed to create a tight seal between the thermostat housing and the engine. This gasket helps prevent coolant leaks while maintaining proper pressure and flow within the outboard’s cooling system. Over time, heat cycles and exposure to water can cause gaskets to harden, compress, or deteriorate, which may lead to leaks around the thermostat housing.

Replacing the gasket during thermostat service ensures the cooling system remains properly sealed and operating efficiently. Using an OEM Yamaha gasket helps maintain correct fitment and dependable sealing performance.

Key Features

• Thermostat Housing Seal – Creates a reliable seal between the thermostat cover and engine housing.

• Maintains Cooling System Integrity – Helps prevent water leaks and maintains proper coolant flow.

• OEM Yamaha Fitment – Manufactured to Yamaha specifications for precise installation.

• Durable Gasket Material – Built to withstand heat, pressure, and marine engine conditions.

Engine & Boat Compatibility

• F150 - 2004-Current
• FL150 - 2010
• LF150 - 2004-Current

Why is this prop a strong choice vs. alternatives?

• Exact OEM Replacement – Designed specifically for Yamaha F150 platform outboards.

• Reliable Cooling System Seal – Helps maintain proper thermostat operation and cooling efficiency.

• Durable Marine Construction – Made to withstand the heat and moisture found in marine engine environments.

• Ideal for Thermostat Service – Recommended to replace when servicing or replacing the thermostat.

FAQ

Q: What does a thermostat cover gasket do?
A: It seals the thermostat housing to prevent cooling water leaks while maintaining proper pressure in the cooling system.

Q: When should the gasket be replaced?
A: It should be replaced whenever the thermostat housing is removed or if signs of leakage are present.

Q: Can a worn gasket cause cooling issues?
A: Yes. A damaged gasket can allow water to leak, reducing cooling system efficiency.

Q: Is this gasket reusable after removal?
A: It is generally recommended to install a new gasket whenever the thermostat housing is serviced.

Q: Does this part fit both right and left-hand rotation engines?
A: Yes, it is compatible with standard and counter-rotation versions of the F150 platform.

• Engine Application
  • F150 - 2004-Current
  • FL150 - 2010
  • LF150 - 2004-Current