<![CDATA[The reliability of the main engine cooling system is essential for ensuring operational continuity and the safety of tugboats, which require rapid propulsion response. This study aims to analyze the causes of cooling system disturbances, their impacts on engine performance and vessel safety, and the corresponding corrective and preventive measures on the ASD Tug Ace Synergy. Data were collected through direct observation, structured interviews with shipboard personnel, and document and literature reviews. On 15 August 2025 in Johor, Malaysia, the jacket cooling water temperature of the port main engine increased from 82 85°C to approximately 96°C, while the seawater cooling pressure decreased from approximately 2.5 bar to 1.3 bar. The engine speed was reduced from approximately 1,500 RPM to 1,000 RPM before the engine was temporarily shut down. Inspection revealed that the seawater strainer was clogged with debris, mud, and marine materials. After cleaning, the pressure returned to 2.5 2.6 bar and the temperature decreased to 82 84°C. The findings indicate that strainer blockage reduces heat dissipation capacity and decreases propulsion and maneuvering availability. Preventive measures require strainer inspections based on operating conditions, reinforcement of the Planned Maintenance System (PMS), parameter trend monitoring, and improved coordination between the engine room and bridge.]]>
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