Common faults of white smoke from excavators are very rare in summer. Generally, white smoke appears when starting in the morning in winter. After the engine is warmed up, everything is normal. Perhaps there is water in the gasoline and diesel or the damage of the cylinder gasket is the most common cause of white smoke. . But the excavator is ultimately made of steel. Even if a high-precision component does not operate in time or a key point is not solved, it will cause trouble problems anytime and anywhere, such as the common failures of white smoke below. Why does the excavator emit white smoke? The excavator repair master said that 99% of the people don’t know the reason, just read this article!
1. The root cause of white smoke from excavators
Generally, the white smoke from the excavator is due to the cold weather and the cold diesel engine shell. The diesel engine is not atomized well, so it becomes oil vapor and organic waste gas is discharged, resulting in white smoke. This kind of thing is all normal, but it does not mean that all the white smoke is normal. Let's take a look at what causes the white smoke from the excavator!
① Poor atomization
The atomization of the diesel engine sprayed into the cylinder is not good. When the atomization of the diesel engine sprayed into the cylinder is not good, the area of the diesel engine is too small, and some gasoline and diesel cannot be combined with CO2 to ignite, so unignited gas is emitted out of the body.
② Poor reduction
The diesel engine is ignited in the diesel engine by mixing the reduced high-temperature steam and the gasoline and diesel fuel injected into the cylinder.
③The parts have poor sealing performance
If the steam leaks during shrinking, the temperature of the steam after shrinking will not meet the ignition requirements, and welding fumes will be discharged if they are not ignited. White smoke caused by water leakage caused by partial destruction of the cylinder head and cylinder head gasket. Put your hand close to the exhaust pipe. When the white smoke passes over your hand, water droplets indicate that the existing water in the cylinder has entered. At this time, the diesel engine is generally weak.
④The cylinder pressure is not enough
White smoke caused by insufficient cylinder pressure. The diesel engine emits white smoke just after starting, and after the temperature rises, it turns into black smoke from the exhaust pipe, which indicates that the cylinder pressure is not enough.
⑤ If the oil supply is interrupted, it is likely to cause the accident to happen early and the angle is too small
Conditions such as unevenness during work, accelerated failure, excessive temperature, and weakness during work will also appear with white smoke. At this time, it can be judged that the fuel supply is interrupted, which may cause the accident to occur early and the angle is too small.
2. Diagnosis and removal
① Check the water temperature meter. If the temperature is too low, the engine exhaust pipe emits milky white smoke, indicating that it is caused by the low temperature of the diesel engine during operation. It should be solved by the ultra-low temperature starting method (heating).
②If the diesel engine is weak during operation, the temperature is too high during operation, and the exhaust pipe emits milky white smoke, most of it is caused by the long time of the oil pump, and it should be adjusted.
③If the diesel engine starts to emit milky white smoke, and it is not easy to start, but there is white blue or milky white smoke after starting, and the diesel engine is weak and sound, the diesel engine is not shrinking well, and it should be repaired or repaired according to the situation. Carry out repairs.
④ If the exhaust pipe emits white smoke while the diesel engine is working, direct the exhaust pipe with your hand to let the exhausted organic waste gas rush through the palm of your hand and check for water droplets. If there are a lot of water droplets on the palm, it indicates If there is water in the diesel engine or water seepage in the cylinder, the cause should be found and solved.
⑤If cylinder pressure, fuel pump time, working temperature of diesel engine are all normal, then the milky white smoke of diesel engine is mostly caused by poor fuel injection pump sprayer, so on-vehicle experiments should be carried out. The method is: remove the fuel injection pump from the human body, connect it to the high-pressure pipe, start the diesel engine, and observe the atomization status of gasoline and diesel sprayed from the fuel injection pump. Because of the milky white smoke discharge, the fuel injection pump should be replaced or replaced. If effective equipment is used to check the atomization quality standard of the fuel pump, the fuel injection pump should be removed and placed on the test bench for adjustment.
Tip: You should pay attention to the color of the exhaust pipe of the excavator when you usually operate the excavator. For this reason, distinguish and analyze whether the diesel engine will produce common faults, find problems as soon as possible, and prevent greater damage.
