Ensure optimal operating temperatures for your marine engine with the Genuine Yanmar 146623-48611 Thermostat. Engineered specifically for Yanmar marine diesel engines, this OEM replacement part guarantees a precise 81°C opening temperature to maintain peak engine efficiency, regulate coolant flow, and prevent overheating. Manufactured in Japan to Yanmar’s strict quality standards, it offers superior durability and reliability designed to withstand harsh marine environments.