We all know that no matter how many excavator diesel engines have moisture, the difference depends on the moisture and large amounts of residue in fake diesel engines. Therefore, many well-known brand excavators are equipped with oil-water separators to filter out the moisture and residue; The purpose is also very established, to avoid excessive moisture in the diesel engine from aggravating the damage of the fuel injector, so as to ensure the smooth operation of the engine and increase the service life. Today, people will take a look at the maintenance and application of many people about the oil-water separator. Misconceptions.
01Basic principle and structure of oil-water separator
First, people should talk about the principle of the oil-water separator. In simple terms, it separates water from oil or separates oil from water; and oil-water separators are divided into industrial types according to their main purposes. Oil-water separators, commercial oil-water separators, household oil-water separators, etc., and oil-water separators are mainly used in petrochemicals, fuel locomotives, wastewater treatment and other levels; what people should say today is the oil and water used on fuel locomotives Separator, also known as vehicle oil-water separator.
The fuel-water separator for vehicle distribution belongs to one of the gasoline filters. For the diesel engine, its key function is to remove the water in the diesel engine, and then promote the diesel engine to meet the requirements of the high-pressure common rail engine for diesel engines; The principle is based on the relative density difference between water and fuel, using the basic principle of force foundation settlement to remove residue and moisture. In addition, it also has external diffusion cones, filters and other components to improve the actual effect of oil-water separation.
02Oil-water separator alarm
If the water flow rate of the oil-water separator exceeds a certain value, the sensor will tick; the alarm codes of different well-known brands of excavators are different. You can compare them independently. People are critically looking at the inspection methods for such things.
(1) First check whether there is too much moisture at the bottom of the oil-water separator, whether there is moisture in the diesel cabinet and the inner cavity of the automobile fuel tank, if there is, the machine must immediately drain the pipe.
(2) If no moisture is detected in the diesel engine or the inner cavity of the fuel tank of the car, then everyone should mainly check the sensor and its wire connectors for loose or damaged conditions, and there will be an alarm because the sensor itself is damaged. Status.
(3) If the two reasons mentioned above are not true, and the common fault alarm of the new sensor still exists, then people need to check from the computer board.
(4) The owner can integrate the quality of the diesel engine that is usually charged as an aid to distinguish. If the quality of the fuel usually charged is weak and the private oil has no quality commitment, etc., it will cause abnormal engine detection in the long term.
03What are the common faults caused by problems in the oil-water separator
(1) Common faults such as engine acceleration and unsteadiness or acceleration of fatigue and black smoke from the exhaust pipe.
The high-pressure fuel injector in the high-pressure common rail system software must accurately control the fuel injection working pressure, fuel injection time and ignition advance angle, and the quality of the fuel injector is more detailed. If there is a problem with the oil-water separator, the water in the diesel engine And the residue will cause damage to the plunger assembly in the fuel injection nozzle and cause contusion, until the fuel injection pump is stuck.
(2) Cylinder deposits
Damage to the oil-water separator will cause carbon deposits in the cylinders, and carbon deposits in the cylinders will cause the engine to start difficult, unstable idle speed, poor acceleration, rapid oil quenching, excessive exhaust gas, increased fuel consumption and other abnormal conditions. Serious conditions will cause the engine damage.
(3) The engine emits white smoke.
After the oil-water separator is damaged, the excavator engine emits white smoke. Because the water in the fuel turns into water vapor when it is ignited, white smoke will appear. The water vapor in the white smoke can damage the high-pressure fuel injectors, resulting in insufficient engine output, and sudden parking conditions. More serious conditions will immediately damage the engine. Once the engine is damaged, it is very troublesome. The excavator repairman who understands the technology solved the problem.
