ANALYSIS OF THE CAUSES AND IMPACT OF FUEL FLOW DISRUPTION IN THE MAIN ENGINE OF THE SHIP SABUK NUSANTARA 108
Abstrak
The main engine is the primary propulsion system of a ship; therefore, the reliability of its fuel system plays a crucial role in ensuring safe and efficient vessel operations. Fuel flow disturbances can lead to reduced engine performance and may compromise operational safety. This study aims to analyze the causes and impacts of fuel flow disturbances in the main engine of Sabuk Nusantara 108. A descriptive qualitative method was employed, utilizing data collection techniques including observation, interviews, documentation, and literature review. The study was conducted during the sea practice period from April 4 to June 4, 2026, aboard Sabuk Nusantara 108, focusing on the Yanmar 6EY17W main engine. The results indicate that fuel flow disturbances were primarily caused by clogged Racor filters, blocked strainers, the presence of sediment and contaminants in Biosolar B40 fuel, and inadequate maintenance of the fuel system. These disturbances resulted in unstable engine speed, reduced engine power, incomplete combustion, difficulty in reaching normal operating speed, and an increased risk of sudden engine shutdown. Corrective actions included cleaning the strainer, cleaning and replacing the Racor filter, draining and cleaning fuel tanks, using high-quality fuel, and implementing regular preventive maintenance. The findings demonstrate that routine maintenance of the fuel system significantly improves the reliability and performance of the ship’s main engine. Berdasarkan data operasional, laju aliran bahan bakar mengalami penurunan dari 240 L/jam menjadi 220 L/jam dan putaran mesin turun dari 900 RPM menjadi 810 RPM ketika terjadi penyumbatan filter Racor dan strainer. Kondisi tersebut menyebabkan terjadinya misfiring dan penurunan performa mesin induk. Operational data shows that fuel flow rate dropped from 240 L/h to 220 L/h, and engine speed dropped from 900 RPM to 810 RPM when the Racor filter and strainer became clogged. These conditions caused misfiring and decreased main engine performance.
Keywords: main engine, fuel flow disturbance, Racor filter, strainer, Sabuk Nusantara 108, marine diesel engine.
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