A Step-by-step Guide To Overhauling Generators On Ships

11. Insufficient Fresh Air Supply: Correct amount of fresh air supply is a must for efficient combustion, if there is reduction in the scavenge air supply, the combustion will be incomplete, which will reduce the engine output

12. High Suction Air Temperature to T/C: When a ship plies in hotter temperature regions (For e.g near equator or Gulf regions in summers) the atmospheric air sucked by T/C compressor is already at higher temperature. If this air is not cooled properly, it will decrease the performance of the engine

13. Charge Air Pressure Too Low: If the scavenge air pressure is low, the amount of air required for combustion to each the cylinder will not be sufficient, which will lead to incomplete combustion

14. Wrong Charge Air temperature: If the cooler controller is set at higher temperature, the temperature of the output air supplied to the engine will be higher, which is not good for engine performance. Similarly, if the setting is on the lower side, the resulting combustion will not be efficient

15. Charge Air Cooler Contaminated: A contaminated and dirty charge air cooler will not allow seawater to cool the air properly, leading to increase in exhaust temperature

16. Air Cooler S.W Temp High: If the sea water temperature is on the higher side, the air cooled by it in the air cooler will be warmer than normal which will lead to high exhaust temperature

17. Air Cooler S.W Bypass Open: The air coolers provided with S.W bypass valve controls the cooling medium i.e seawater. If the bypass is open more than required, then the air supplied to the engine will have higher temperature

18. Blower, Turbine or Nozzle Ring Worn/ damage: Fouled or damaged part of turbocharger will lead to either problem in the passage of exhaust gas or less amount of fresh air supply. These will lead to sudden reduction in the output of the engine

19. Scavenge Air Leakage: Leaking scavenge air from the inlet pipe to the cylinder will result in less supply of air and incomplete combustion

20. Wrong Tappet Clearance Setting: Wrong tappet clearance will allow inlet/ exhaust valves to open more or less than required. This will result in either inappropriate combustion or the combustion mixture drawing out of the chamber at an earlier stage.

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