Sierra 118-3637 Thermostat for Yamaha Outboard Engines

The Sierra 18-3637 is a premium replacement thermostat designed specifically for Yamaha outboard engines. This high-quality marine thermostat regulates engine temperature by controlling coolant flow, ensuring your engine operates at optimal temperature for maximum performance, fuel efficiency, and longevity.

Advanced Design Features:

• Advanced air-bleeding design with bleed notches and check valves to eliminate air pockets in the cooling system
• Stainless steel piston construction for extended service life and reliable operation
• Brass cover and guide on motor piston for enhanced thermal efficiency
• Stainless steel spring structure with channel construction for superior strength and durability
• Precision spring compression allows engine to quickly reach optimal operating temperature
• Corrosion-resistant materials engineered to withstand harsh marine environments

OEM Replacement Information:

• Direct replacement for Yamaha OEM part number 6CB-12411-10-00
• Meets or exceeds original equipment specifications
• Designed for Yamaha VF200LA, VF225LA, VF250LA outboard models (2011-2018)
• Also compatible with VF200LB, VF225LB, VF250LB models (2021-Current)

Sierra Marine has over 50 years of experience manufacturing marine engine parts and supplies many OEM engine manufacturers. A malfunctioning thermostat can cause overheating, engine damage, reduced performance, and poor fuel economy. Regular thermostat replacement is essential preventive maintenance for your Yamaha outboard engine.