Why Does Diesel Generator Set Emit Abnormal Color Smoke

The normal smoke color of diesel generator set is colorless and transparent, but sometimes abnormal smoke color occurs, such as white smoke, blue smoke, black smoke, etc. Abnormal smoke color of diesel generator set indicates that the unit has encountered a failure Different smoke colors indicate different faults. Users should learn to judge the diesel engine malfunctions based on the smoke color. When the smoke color of the diesel generator set is found to be abnormal, it must be repaired in time.

The normal smoke color of diesel generator set is colorless and transparent, but sometimes abnormal smoke color occurs, such as white smoke, blue smoke, black smoke, etc. Abnormal smoke color of diesel generator set indicates that the unit has encountered a failure. Now, different smoke colors indicate different faults. In this article, Dingbo Power will analyze the causes of different smoke colors produced by the unit.

Diesel generator set emits white smoke

White smoke from the exhaust pipe of a diesel generator set mostly occurs when the generator set has just started or is in a cooling state. This is caused by the low temperature in the cylinder of the diesel generator set and the evaporation of oil and gas. This is especially noticeable in winter. If the exhaust pipe still emits white smoke when the engine is warming up, it is judged that the diesel engine is malfunctioning. There are several reasons: 

1. The cylinder liner is cracked or the cylinder gasket is damaged, cooling water enters the cylinder, and water mist or water vapor is formed when exhausting;

2. Poor atomization of the fuel injector and dripping oil;

3. The fuel supply advance angle is too small;

4. There is water and air in the fuel;

5. The fuel injection pressure is too low, the fuel injector is dripping seriously, or the fuel injector pressure is adjusted too low.

Diesel generator set emits blue smoke

In the initial operation of the new diesel generator set, there will be a slight blue smoke from the exhaust gas. This is a normal phenomenon. Here is the blue smoke from the diesel generator set after a period of normal operation. At this time, it is mostly because of lubrication. The oil enters the cylinder and evaporates when heated to become blue oil and gas, which emits blue smoke along with the exhaust gas. There are several reasons why lubricating oil enters the cylinder:

1. The air filter is blocked, the air intake is not smooth or the oil level in the oil pan is too high;

2. During the operation of the diesel generator set, the amount of oil in the oil pan is too much or too little;

3. Wear of piston rings, pistons and cylinder liners;

4. The cylinder head gasket near the engine block leading to the cylinder head oil passage is burned;

Diesel generator set emits black smoke

The main cause of the black smoke from the diesel generator set is that the diesel that enters the combustion chamber is not fully burned before being discharged outside, which forms the phenomenon of black smoke from the generator set. The reasons why the fuel is not fully burned are as follows: 

1. Wear of piston rings and cylinder liners;

2. The injector is not working well;

3. The shape of the combustion chamber changes;

4. Improper adjustment of fuel supply advance angle;

5. The oil supply is too large.

The abnormal smoke color of the diesel generator set will cause the unit to fail to operate normally, affect the power of the unit, increase the fuel consumption rate, and generate carbon deposits, which can easily cause the unit to malfunction and affect the service life. Therefore, users should learn to judge the diesel engine failure based on the smoke color. , When the smoke color of the diesel generator set is found to be abnormal, it must be checked and repaired in time. If you have any questions, please call +86 13667715899 for consultation or contact us by email dingbo@dieselgeneratortech.com.