Sierra 18-36140 Marine Engine Thermostat for Mercury Outboard

The Sierra 18-36140 is a precision-engineered thermostat designed for Mercury outboard engines, serving as a critical cooling system component that regulates engine operating temperature to ensure optimal performance, fuel efficiency, and longevity.

How It Works:

The thermostat controls coolant flow through the engine's cooling system by opening and closing in response to temperature changes. When the engine is cold, the thermostat remains closed to allow quick warm-up to optimal operating temperature. Once proper temperature is reached, it opens to allow coolant circulation, maintaining consistent engine temperature and preventing overheating.

Key Features:

• Manufactured to meet or exceed OEM specifications with quality construction for reliable, accurate temperature control
• Direct replacement for Mercury marine applications
• Precision-engineered for consistent performance
• Built to withstand harsh marine environments

Whether performing scheduled maintenance or replacing a failed thermostat, this Sierra component delivers the quality and reliability needed to maintain proper engine temperature in demanding marine conditions.