The reasons why diesel engines emit white smoke are:

1. Low engine temperature: When the engine has just started or when the outside temperature is low, the white smoke phenomenon is obvious. This is because the engine itself When the temperature is low, the temperature of the combustion chamber and cylinder wall is also low, and the fuel mist cannot be evenly and completely mixed with the air, causing the quality of the combustible mixture to decrease.

Unburned diesel molecules are discharged together with the exhaust gas, and white smoke is emitted from the engine. The solution is to pay attention to the insulation of the water tank after the locomotive is started, and drive with medium throttle to keep the temperature of the locomotive above 50 degrees and slow down. Increase the load slowly.

2. Fuel injector failure: When the pressure adjustment of the fuel injector is too small or the elastic force of the compression spring is too soft, the opening pressure of the fuel injector is reduced, which increases the amount of fuel entering the cylinder, which is the so-called There is too much fuel supply. In severe cases, it will be injected into the cylinder in the form of a column of oil. The unburned fuel will evaporate and be discharged, causing the engine to smoke. The solution is to replace the fuel injector.

3. Fuel injection pump failure: The oil delivery valve assembly is one of the precision components in the fuel injection pump assembly. If its sealing is damaged, part of the fuel in the high-pressure fuel pipe will flow back to the fuel injection pump. Oil pressure decreases.

When the fuel injection starts in the next stroke, in order for the oil pressure in the oil pipe to reach the injection pressure, a longer fuel supply time must be required to compensate, which will cause the fuel injection time to lag and incomplete combustion. The fuel is discharged along with the exhaust gas and the engine emits white smoke. The solution is to replace the oil delivery valve or fuel injection pump.

Diesel engine maintenance:

To extend the service life of the diesel engine, it is necessary to strengthen the air filter, lubricating oil filter and fuel filter during use. Maintain filters to maximize their effectiveness.

When installing the air filter, do not miss, reverse or incorrectly install the sealing gaskets and rubber connecting pipes, and ensure the tightness of each embedding. The paper dust cup air filter used needs to be cleared of dust once every 50-100 hours of operation. Use a soft brush to brush off the surface dust.

If the working time exceeds 500 hours or is damaged, it should be replaced in time. Use an oil bath air filter. Every 100-200 hours of operation, clean the filter element with clean diesel and replace the lubricating oil in it. If the filter element is broken, it needs to be replaced immediately. Pay attention to adding lubrication according to regulations during use. Oil.