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5 Methods for Diagnosing Faults of Marine Diesel Generator Sets

Oct. 29, 2021

When a marine diesel generator set encounters an abnormal fault, it is necessary to conduct a fault diagnosis in time. The crew operator is best to understand some basic common sense of the marine diesel generator set in advance, in case of emergency, so as not to be in a hurry in the event of an abnormal situation. In fact, many times users can use some simple methods to diagnose. In this article, Starlight power generation equipment is here to introduce you in detail.

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1. Listening method: Use a stethoscope or with the help of a metal rod, close to the injector body, and listen to the sound of each cylinder. The normal sound is similar to the sound of metal tapping "Dangdang". If there is only a continuous but not crisp sound of "ho ho", the oil supply of the cylinder is too low, or the tank did not catch fire in time. If the percussion is too large, it means that the fuel supply of the cylinder is too large or the fuel injection time is too early.

2. Color viewing method: The marine diesel generator set works normally, and the exhaust gas color is light gray and the load is slightly darker. If black gas is exhausted, it indicates that the combustible gas is incompletely burned. Exhausting blue smoke indicates that the lubricating oil enters the cylinder and burns. Exhausting white smoke means that there is water and combustible gas in the diesel that are not burned and white smoke is discharged. The exhaust pipe continuously discharges abnormal smoke color, indicating that the individual cylinders are not working properly.

3. Temperature sensing method: In the most out stage after the marine diesel generator set is started (the temperature of the exhaust pipe is very high after working for a period of time, it will be burned by touching it by hand) by touching the temperature of the exhaust pipe manifold of each cylinder by hand, it can be identified The working conditions of each cylinder. If the temperature of the exhaust manifold of a cylinder is higher than that of other cylinders, it means that the fuel supply of the cylinder is too high; if the temperature is low, the fuel supply of the cylinder is low, or the fuel is not injected or not completely burned after fuel injection, or does not burn.

4. Pulsation method: Pinch the high-pressure fuel pipe by hand to feel the pulsation of the fuel injection pump when it is spraying. Small pulsation: The cylinder with weak explosion sound and low temperature has less fuel supply; abnormal explosion sound and high temperature are caused by the drop of fuel injection pressure of the fuel injector, poor fuel injection atomization, or failure to catch fire and complete combustion in time. Large pulsation: The cylinder with strong burst sound and high temperature is too large for the fuel supply; weak burst sound and low temperature, the injector roars or the needle valve is stuck.

5. Cut off the oil circuit method: In order to accurately determine which cylinder is faulty, cut off the high pressure pipe to the injector iron oil circuit cylinder by cylinder and stop working to observe the changes in the working condition of the diesel engine. When the oil circuit of a certain cylinder is cut off, if the speed and sound of the diesel engine do not change or change little, it means that the cylinder is working normally. Such as intermittent knocking on the cylinder and exhausting black smoke. When the oil circuit of a certain cylinder is cut off, the failure phenomenon disappears, it means that the failure is in the cylinder.

A simple diagnosis method helps to find out the correct remedy for the problem of marine diesel generator set in time, thereby improving the working efficiency of the set. If the problem cannot be diagnosed by using the above problems, Starlight Power Generation Equipment recommends that you consult the manufacturer's professional technicians in time to avoid losses.

Starlight Power was founded in 1974 and is one of the earliest manufacturers of generators and diesel generator sets in China. If you want get more information, please feel free to send email to sales@dieselgeneratortech.com we will pay highly attention on your question.

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