In winter, when the temperature is low, the diesel engine will emit white smoke when it starts. I believe many excavators are familiar with this phenomenon. However, there are many friends who are too optimistic about the phenomenon of the white smoke coming from the engine, resulting in serious losses. So what are the reasons for the white smoke of the excavator engine? Today, let's say it.
Talk about the cause of the excavator's white smoke
When it comes to white smoke, I believe a lot of excavator friends will say that the white smoke is cold, the engine's fuselage is cold and the diesel atomization is bad, so it becomes oil vapor, and then with the exhaust gas, it is more normal to smoke the white smoke. In fact, this is only a normal phenomenon when the winter car has just started. If it works, the white smoke continues, or is intermittent, that means the engine has a problem. Let's talk about it now.
1, white smoke caused by poor atomization of diesel oil. The cold weather mentioned above is one reason why diesel sprays poorly and produces white smoke, but this phenomenon will disappear with hot cars. The other diesel atomization is due to the failure of the nozzle. When the water temperature is about 70 degrees C, the exhaust smoke is turned from white smoke to black smoke. At this time, it can be judged to be a failure of the injection nozzle.
2, there is water in the diesel oil that causes white smoke. This situation is also quite common, especially for oil-water separators. This problem is also better solved, and it can be solved by directly discharging excess water.
3, the cylinder head and cylinder cushion parts are damaged and the white smoke caused by water intake. Put your hand near the exhaust pipe, and when the white smoke sweeps over the face of the water droplets indicate that water has entered the cylinder, at this time there is generally accompanied by engine weakness.
4, white smoke caused by insufficient cylinder pressure. When the engine starts to start white smoke and temperature rises, it becomes black smoke, which indicates that the cylinder pressure is insufficient.
5, the oil supply lead angle is too small to lead to white smoke. The phenomenon of uneven work, insensitive acceleration, excessive temperature, inability to work will also accompany the occurrence of white smoke, which can be judged as too small fuel supply advance angle.
6, in addition, the intake valve lax will also cause the engine to smoke white smoke.
In the iron armour forum, about the engine white smoke posts are not a few, many good-hearted netizens have also given the answer. Let's take a look at it.
A friend old playboy: Good start, white smoke, maybe the injector atomization is not good, or the temperature is too low, usually pay attention to the maintenance of diesel filter.
The air temperature of a friend KOMATSU-pc200-8:1 is too low
2 injector nozzle nebulization
3 high pressure pump fire position incorrect
According to your symptoms disappear after a certain time, it can be judged that the temperature is low. If it has nothing to do with the temperature. Then 2, 3 of the symptoms will continue.
A friend Hitachi -3: the white smoke fault in the operation of the engine is mostly due to the large water content in the fuel. When the vehicle starts in cold winter, a large amount of white smoke appears in the exhaust cylinder, which is caused by low intake air temperature and large air humidity. After the Volvo excavator starts, if the white smoke emission time is long, it is usually the failure of the preheater.
Poor fuel quality, poor atomization of fuel injectors, blockage and leakage of intake pipes can cause black smoke. Turbocharger engine, if the turbocharger failure, will also lead to insufficient intake and smoke.
Jia friend modern 450: white smoke and blue smoke are a kind of transition smoke. It is a kind of smoke exhaust in a diesel engine, especially in a short time after cold start. It starts white, and then turns to light blue, then turns to normal colourless. If there is still white smoke for a long time, the reason may be that the fuel injection pressure of the injector is too low, the fuel supply advance angle is too late or a certain cylinder is too late; the water content in the fuel is too much; the diesel engine temperature is overbottomed; the diesel engine cylinder is inflow.
Summary: when the engine is white smoke, if it is a cold car after a short time, it becomes normal, which means that the engine body temperature is low, this kind of situation is normal. If the white smoke time is longer, or after the white smoke is changed into black smoke or blue smoke, it is necessary to check the engine at this time to see where the engine has trouble and solve the problem in advance so as not to cause unnecessary loss.
