Why does the exhaust pipe of the Komatsu excavator engine emit white smoke

White smoke from the Komatsu excavator engine opens the opening of the piston ring. Replace the supercharger thrust bearing to adjust the piston oil ring. If the cylinder block of the excavator has sand holes, cracks and cylinder gasket damage, the necessary testing equipment is required, and the maintenance workload is large, and it should be sent to the maintenance plant for maintenance in time.

Water in the fuel of the excavator should be replaced in time. The excavator engine emits white smoke when the car is running cold, and turns into black smoke when the car is hot, which indicates that the engine's control system or fuel system is not working properly, resulting in excessive mixture. In this regard, it should be repaired according to the fault of over-concentration of the mixture.

1. Cause of failure: There are two main factors that cause this situation due to high moisture in the fuel:

First, the quality of the purchased fuel is very low, and the water content in the fuel is high;

The second is that the oil-water separator is faulty and cannot separate the water in the fuel.

Solution: For this kind of failure, ensure that you buy quality assured fuel, and then check the oil-water separator frequently to ensure that there is no fault, and remove the separated water in time.

2. Cause of failure: coolant enters the cylinder.

Coolant can enter the cylinder because of damage to the cylinder liner or gasket. After the coolant enters the cylinder, it is mixed with fuel at high temperature and high pressure, which produces a large amount of water vapor, and white smoke will appear when it is discharged.

Solution: The engine must be inspected and repaired, carefully check whether the cylinder liner and cylinder gasket are cracked or damaged, and if damaged, replace it directly.

There are generally five reasons: high moisture content of diesel, faulty injectors, individual cylinders not combusting, coolant entering the cylinders, and improper adjustment of the fuel supply advance angle.

The working fluid that enters the cylinder is pure air. Due to the less resistance of the diesel engine intake system, the pressure at the end of the intake air is pa= (, which is higher than that of the gasoline engine. The intake terminal temperature ta=300 340K, which is lower than that of a gasoline engine.

Since the compressed working fluid is pure air, the compression ratio of diesel engines is higher than that of gasoline engines (generally =16 22). The pressure at the end of compression is 3 000 5 000 kPa, and the temperature at the end of compression is 750 1 000 K, which greatly exceeds the autoignition temperature of diesel (about 520 K).

The Science of Excavator Engines:

The running device is the chassis, including the crawler frame and the walking system, which is mainly composed of the crawler frame, the walking motor + reducer and its pipeline, the driving wheel, the guide wheel, the carrier pulley, the roller, the crawler, the tension buffer device, its function is to support the weight of the excavator, and the power transmitted by the driving wheel is converted into traction, so as to realize the walking of the whole machine.

The frame assembly (i.e., the crawler walking frame assembly) is an integral welded piece with an X-shaped structure, and its main advantage is that it has a high load-bearing capacity. The frame assembly is welded by three parts: left longitudinal beam (i.e., left track frame), main frame (i.e., intermediate frame), right longitudinal beam (i.e., right track frame). The weight of the frame assembly is 2 tons.

White smoke may be due to the wear of the gasket of the engine cylinder, which creates a certain gap and causes a large amount of water from the cooling system to enter the combustion chamber. Water cannot be burned, and when heated, water vapor is generated, which is discharged directly from the exhaust pipe.

In this case, you can check whether the engine block, cylinder head gasket is damaged, and check whether there is water in the fuel tank. Also, check the car manual and add the correct gasoline according to the manufacturer's regulations. In addition, a small amount of white exhaust gas will also come out when the car is heated at low temperature, which is a normal phenomenon of cold and heat exchange, and the white smoke will disappear naturally after the car is hot.

White smoke means there is water in the combustion chamber! Check to see if there's a leak or water in the oil! Also check the exhaust pipe for water.

Isn't the country smoking banned? How to dig the excavator also began to pump, it is quite serious, and if it is not done well, it will become lung cancer.

Is it energetic? The fuel injector is stuck and weak. The fire head is late,

There are generally five reasons for this: Diesel has a high water content.

Injector failure.

Individual cylinders do not burn.

Coolant enters the cylinder.

Improper adjustment of the oil supply advance angle.

In the case of low diesel quality or failure of the function of the oil-water separator, the diesel fuel entering the engine often contains some water, which forms an uneven fuel mixture with the diesel fuel injected into the cylinder, and produces a large number of unburned hydrocarbons and water vapor after the cylinder compression combustion, making the exhaust color white.

The solution to the white smoke produced in this situation is to use oil of guaranteed quality, and at the same time use an effective oil-water separator, check the oil-water separator every morning before the engine starts, and remove the water in time.

Under the normal working condition of the engine, the fuel is injected into the cylinder in an atomized state, and after the injector fails, the fuel may enter the cylinder in the form of oil droplets, and in the process of compression, the fuel mixture in the cylinder is uneven, so that the fuel combustion in the work process is not sufficient, and there are a large number of unburned hydrocarbons and water vapor in the exhaust.

When this situation occurs, it is necessary to determine which cylinders' fuel injectors are faulty, and the faulty fuel injectors can be eliminated by using the method of cylinder breaking one by one and replaced in time.

When the cylinder is not working, the cylinder injector will still inject fuel, and the fuel mixture in the cylinder may become fuel vapor after the compression temperature rises, resulting in white smoke when exhausting. In this case, the production of white smoke is often accompanied by a decrease in engine power and a decrease in power.

Troubleshooting of such faults can also be done using the cylinder-by-cylinder break-off method. Determine that one or several cylinders do not burn, and then carry out the next step of investigation of the cause of non-combustion.

Coolant into the cylinder will also make the exhaust produce white smoke, the principle is the same as too much water in the fuel, the coolant into the cylinder may be due to the cylinder liner cracks or gasket damage, high temperature and high pressure coolant into the cylinder after high temperature and high pressure, in the exhaust will form white water vapor.

At the same time, you can check whether the engine oil has increased to determine whether the coolant has entered the cylinder, and after confirming that the coolant has entered, the engine needs to be inspected and repaired, and the damaged cylinder liner or cylinder gasket should be replaced.

If the advance angle of fuel supply is too small, the fuel injected into the fuel injector before the piston runs to the top dead center of the cylinder is too small, the amount of premixed gas is reduced, the combustion speed of the mixed gas is reduced and the combustion end time is late, and a large amount of water vapor smoke is formed.

When the fuel supply is too late, part of the fuel is discharged without combustion, forming diesel vapor, and the exhaust turns white.

Due to the improper adjustment of the fuel supply advance angle, the white smoke is generated, and the fuel supply advance angle of the engine needs to be readjusted, and the timing adjustment needs to be carried out according to the camshaft gear scale.

Finally, I would like to add: In addition, when the engine temperature is too low, there may also be white smoke from the exhaust, which is due to the fact that part of the diesel fuel is not burned at low temperatures and becomes oil vapor discharged from the exhaust port, producing white smoke.

There are several factors that contribute to the black smoke of the engine, and the more likely ones are:

Improper use of fuel and poor quality;

The air filter element is clogged and the air intake is insufficient;

damage to the turbocharger;

Excessive fuel injection from the fuel injection pump;

Valve clearance is not suitable;

The timing of fuel injection is not accurate;

The cylinder or piston ring is worn, and the cylinder is leaking;

Injector failure and so on.

Hello, I am your car master exclusive mechanic at your service. Here's a great day. The Year of the Tiger is auspicious.

We promise to be attentive, careful and attentive to solve your car troubles. Provide you with fault solutions and repair methods for your car. Hello friend, if your excavator is idle and emitting white smoke, this is because your engine may have the problem of this flush cylinder, and there is water inside the white smoke, check whether this antifreeze is missing, if the antifreeze is missing, you need to replace this cylinder gasket friend.