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Generators are one of the important auxiliary aircraft needed on ships for power generation. During the operation of a diesel generator, continuous rotation occurs resulting in friction and erosion of the moving parts. The supporting factor for the smooth running of a diesel engine is a lubrication system that is supported by good lubricating oil quality, besides that it also needs to be supported by an adequate and good cooling system. The use of lubricants is one of the most important factors to ensure the performance of diesel engines. The lubricant is in charge of maintaining the condition of the engine so that it remains stable. This study aims to analyze the effect of using lubricating oil beyond the operating hours limit on engine heat. Furthermore, it also discusses steps to ensure diesel engine temperatures remain normal. This research was carried out during the practice of sailing on a ship for approximately one year. This study uses a descriptive quantitative research method. The primary data obtained directly utilizes observation methods, and documentation. Secondary data was obtained from existing articles and journals. The data analysis techniques used are descriptive analysis and inferential analysis. The results of this study show that the working hours of lubricating oil use have a significant influence on the increase in the temperature of diesel generator engines as evidenced by hypothesis tests on two engine units, namely AE1 and AE2. In the AE1 unit, a t-value of 18.467 with a significance of 0.000 was obtained, while in AE2 the t-value was 14.289 with a significance of 0.000. The significance value in both units is less than 0.05 so it can be concluded that the working hours of lubricated oil have a significant influence on the temperature of the genarato diesel engine on the ship.

Corrective maintenance is one of the maintenance strategies performed after system failures or malfunctions occur, particularly in diesel power plants (PLTD) that play a crucial role in supplying electricity to remote areas such as Jayapura. This study aims to identify the types of failures occurring in diesel engines at the Jayapura PLTD and to evaluate the corrective maintenance actions implemented. Data were collected through direct observation during an internship program, interviews with technicians, and analysis of historical maintenance and failure records. The results indicate that the most common failures occurred in the lubrication system, fuel system, and cooling system. Corrective actions included component repairs, spare part replacements, and system adjustments. The application of timely and appropriate corrective maintenance significantly reduced machine downtime and improved the reliability of the power generation system. This study recommends integrating corrective and preventive maintenance strategies to maximize operational efficiency of the PLTD.

The rapid advancement of technology today encourages every human being in matters related to the field of industrial or machinery needs, which has a function as a power transfer from the driving force (diesel engine or electric motor dynamo) to the engine to be driven, Gearbox is a component of a machineconsisting of a house for gears, In one of the uses of machine construction and in some components often involves professional welding techniques, one of which is welding using electric arc / Shielded Metal Arc Welding (SMAW), the selection of appropriate welding current parameters affects the strength and changes in the mechanical properties of a metal. The current used is too low will cause the difficulty of igniting the electric arc, and the electric arc that occurs is unstable, this test wants to examine using high carbon steel, namely JIS S45C STEEL (ASTM 1045) in the application for gears on the Gearbox through SMAW weldingusing electrodes (E11018-G) Ø3.2 mm with current variations of 90 A, 100 A and 110 A, and see its mechanical properties of NDT testing, tensile testing, and impact testing (charpy). The NDT test results obtained no indication of cracks in the variations of 90, A, 100 A and 110 A and the porosity indication only occurredin the variation of 100 A, in the Tensile test test obtained good results in the current variation of 90 A and the less good occurred in the variation of 100 A. In the Im test test, the results of the NDT test were obtained.

This research investigates the influence of fuel atomizer performance on maintaining ship diesel engine performance, focusing on ANT (Nautika - Deck Officers) and ATT (Teknika - Engine Officers) students at STIP Jakarta. The study aims to analyse the practices related to the Planned Maintenance System (PMS) and their impact on fuel atomizer performance among these student officers. Qualitative research methods, including questionnaires, were employed to collect data from ANT and ATT students. The Likert scale was used to measure attitudes, opinions, and perceptions regarding fuel atomizer performance and PMS practices. The research highlights the critical role of fuel atomizers in diesel engine optimization and underscores the importance of effective PMS practices. The findings provide valuable insights for enhancing ship diesel engine performance through improved maintenance strategies.

Heat transfer in diesel engines is known to affect engine efficiency and emissions. Increased heat transfer to the combustion chamber walls reduces the pressure in the cylinder and the average gas temperature, which reduces the work transferred to the piston per cycle. Therefore, the amount of heat transfer in an engine largely depends on the efficiency of the engine. Changes in gas temperature due to heat loss from the combustion chamber also affect the formation of pollutant emissions. Higher temperatures in the cylinder promote NOx emissions, while lower temperatures in the cylinder create Particulate matter in the exhaust. Engine heat transfer is important, so engine heat transfer results must be accurately estimated.

Community Service is an obligation for lecturers to carry out the Tridharma of Higher Education. The activity was carried out on June 18, 2022 in Jelamung RT 05 RW 02, Kemujan Karimujawa which was attended by 12 participants. The purpose of this service is to know how to maintain fishing boat outboard engines in general, which is used to change the engine oil, cleaning the air filter and fuel filter, testing the injectors and adjusting the valves, in addition it is to know the reason why the engine cannot start. Therefore, someone should check the fuel flow, opening the fuel filter and cleaning it. The implementation of this program is for fishermen’s beneficial, hance they can maintain and overcome engine damage for the sake of progress and increase the income.