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All Journal Jurnal Bahari dan Teknologi (BARTEK)
Mursidi Mursidi
Universitas Hang Tuah Surabaya
Control & Systems Engineering Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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Analisis Kerusakan Valve Inlet dan Outlet pada Diesel Generator No. 3 di MV. Golden Rejeki Roby Fitriansyah; Mursidi Mursidi; Dyah Agustin Widhiyanti
JURNAL BARTEK Vol 2 No 2 (2026): Jurnal Bahari dan Teknologi [BARTEK]
Publisher : Politeknik Bumi Akpelni Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.6425/d69w1w09

Abstract

Damage to inlet and outlet valves can disturb the combustion process and reduce the reliability of a ship's diesel generator. This study aimed to analyze the causes of inlet and outlet valve damage on Diesel Generator No. 3 aboard MV. Golden Rejeki, identify its effects on engine performance, and describe the corrective actions carried out. The study used a descriptive qualitative approach. Data were obtained through direct observation during sea practice, interviews with engine-room personnel, and documentation of inspection and repair activities. The data were analyzed through systematic organization, reduction, presentation, and conclusion drawing. The findings showed carbon deposits and wear on the inlet valve, while the outlet valve had a burned surface and a cracked spindle. The valve seat also showed an uneven contact surface and leakage. The damage was associated with high operating temperature, carbon deposits, component wear, and less-than-optimal periodic inspection. Its effects included increased exhaust-gas temperature to 460°C, reduced compression, unstable engine operation, increased vibration, and declining generator output. Repairs consisted of cylinder-head overhaul, component replacement, carbon cleaning, valve grinding/lapping, leakage testing, and valve-clearance adjustment. After repair, the generator operated stably and its monitored parameters returned to normal.
Analisis Tidak Sempurnanya Pengabutan Injektor pada Mesin Induk No 1 di TB Nisrina Riski Samudera Reda Pradana; Mursidi Mursidi; Rodlitul Awwalin
JURNAL BARTEK Vol 2 No 2 (2026): Jurnal Bahari dan Teknologi [BARTEK]
Publisher : Politeknik Bumi Akpelni Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.6425/4c6z6549

Abstract

Uncomplete fuel atomization in the No. 1 main engine injector of TB Nisrina Riski Samudera VII was associated with reduced engine performance, elevated exhaust gas temperature, black smoke, and abnormal engine vibration during operation. This study aimed to identify the causes of incomplete injector atomization, describe its effects on main-engine performance, and determine corrective actions. A descriptive qualitative approach was applied during the sea-practice period on board the vessel. Data were obtained through direct observation, interviews with engine-room crew, documentation, and review of ship and engine references. The findings showed three dominant technical conditions: carbon deposits partially blocked the nozzle holes, injector-spring elasticity decreased so that opening pressure fell below the specified value, and the injector needle became dirty and stuck. The injector test recorded about 28 MPa (290 kg/cm²), whereas the manual-book value used in the study was 34 MPa (350 kg/cm²). The incomplete spray pattern contributed to incomplete combustion, exhaust-gas temperature of 550–600 °C, black smoke, unstable combustion, and a reduction of engine speed to around 1200 rpm under high towing load. Cleaning the nozzle and needle, replacing the weakened spring, periodically replacing the fuel filter, cleaning the fuel tank, and retesting injector pressure restored the spray pattern to normal at 34 MPa.
Co-Authors Awwalin, Rodlitul Dyah Agustin Widhiyanti Reda Pradana Roby Fitriansyah