What is the cause of the leakage of the return pipe of the car engine?

The car exhaust pipe dripping water is because the gasoline is completely burned to produce water and carbon dioxide, water is water vapor at high temperature, water vapor is colorless and transparent at high temperature, but when the temperature is lower than 100 degrees, water vapor will condense into water, if the condensed water droplets are small and suspended in the air, water vapor will appear as white gas, when the ambient temperature is low, white smoke from the exhaust pipe is water vapor; If condensed water droplets accumulate, it becomes water.

It is a very normal phenomenon for the exhaust pipe of the car to drip water, which means that the engine is working normally, indicating that the oil and gas mixture in your engine is fully combusted, and don't make a fuss when you see the white smoke coming out of the exhaust pipe in winter, that is the same as dripping water, just water vapor, if you see green smoke, then you have to go to check, most of the green smoke is the performance of burning engine oil.

Generally, there are several reasons:1Because the car air conditioning system is equipped with an evaporator in the dashboard of the car, when the air conditioner is turned on (a c button on), the surface temperature of the evaporator is very low, the water in the hot air in the car will condense on the surface of the heat-absorbing fins of the evaporator, and the water droplets are collected by the plastic shell of the evaporator to be discharged out of the car by pipes, if the vehicle is suspended for a period of time, sometimes you can see a very clean and transparent pool of water, please don't worry about the car failure, because the cooling water of the engine is usually antifreeze (green, red or blue).

2.Outside the compressor (low-pressure area) in the engine compartment, water from the condensed air can drip on the ground (sometimes more than the evaporator's displacement). 3.

If the low-pressure pipeline is not covered with insulating foam, the surface of the pipeline is easy to condense the moisture in the air, and the water droplets often condense and drip down the lowest point of the pipeline. If there is dripping water under the dashboard in the car, there are generally the following possibilities:1

If the air conditioner is too cold, the moisture in the air will condense outside the air outlet, forming the phenomenon of white smoke, and the moisture in the air will also condense on the surface of the plastic shell of the evaporator or the plastic pipe shell that transports cold air, resulting in the phenomenon of dripping. This is more likely to happen in cars with poor insulation over the plastic casing of the evaporator or the plastic pipes that transport the cold air. 2.

There are two main reasons why the air humidity in the car is too high, the first reason is that the air circulation function outside the car is continuously used, and the air outside the car with high humidity is continuously sent into the car, and the humidity (moisture) in the car cannot be reduced (discharged to the outside of the car). The second reason is that the air tightness of the car body is poor, and the air outside the car with high humidity continues to seep into the car. Another typical condition in which the air humidity in the car is too high is the formation of water droplets around the exit, which can be observed by the car owner.

3.The drain line of the evaporator's plastic housing is blocked, and when the water level is too high and overflows, it can also drip water in the car. 4.

Broken plastic casing of the evaporator or loose drain lines can also drip water in the car. 5.The small heating tank inside the dashboard ruptures, and the cooling water of the engine leaks, because the cooling water of the engine is usually antifreeze (green, red or blue), and the dripping water will have a color and will have a smell, which is easily distinguished from the clean dripping phenomenon of 1 4 above.

Water in the exhaust pipe of a car indicates that the engine is in good combustion condition.

What causes dripping water in a car exhaust pipe? Don't be sloppy, the engine has to be scrapped in advance.

When the body parts on the engine, such as the oil tank, water tank, oil pipe, water pipe and other parts of the sand hole caused by leakage, the effect of leakage control can be achieved by applying adhesive to clean the damaged parts。Having said all this, should you also have a certain understanding of the hazards and solutions of the engine saying "three leaks"? Therefore, when encountering the "three leaks" of the engine, we must pay attention to this phenomenon, and check and eliminate it in time.

Car quality problems are just two ways to complain, find the manufacturer and the third party, if the manufacturer can not deal with it or the result is not satisfied, you can only find a third party to deal with, China's third party is more, but the only credible network, after all, the number and credibility of complaints are very high, the state also attaches more importance to the manufacturer's complaints on the quality network will also be dealt with in a timely manner. So if you want to really solve the vehicle problem, you can only go to the quality network.

To prevent oil leakage from the leak-proof gasket of the engine oil pipe joint, you can add a layer of thin plastic gasket with smooth double-sided smoothness on both sides of the leak-proof gasket to tighten it firmly to prevent leakage. If there is leakage in the joints of the engine fuel tank, water tank, crankcase, etc., you can soak the paint sheet in alcohol, and apply the paint liquid to the clean seams to cure the leakage. However, the cost of paint chips is high, and it is generally used in emergencies.

When the paper pad leaks in the engine oil pan, cylinder head, gear chamber cover, crankcase back cover, etc., as long as the paper pad is intact and the joint surface is clean, you can apply a layer of butter on both sides of the paper pad and tighten the bolts to prevent leakage. If replacing the new paper pad, soak the new paper pad in diesel fuel for 10 minutes before installation, then remove and wash it, apply a layer of butter to the surface of the joint.

When the ventilation bolts, stud bolts and screws on the engine are blocked and leaking, applying anaerobic glue on the cleaning bolts, threads or screw holes can quickly cure to form a film, fill the gap between the parts, withstand greater pressure, and have strong anti-vibration and loose fastening functions. If it is used for engine high-pressure oil pipe fitting threading, the leakage control effect is better. When the shaft and bushing, bearing and bearing seat, valve and seat, self-tightening oil seal, felt cup, packing packing on the engine leaks, the worn parts of the parts after cleaning can be coated with dimensional recovery glue.

After curing, a wear-resistant, heat-resistant, and mechanically strong film layer is formed, and then mechanical processing such as vehicles, boring, scraping, and documents is carried out to restore the geometry and fitting accuracy of the parts and solve the leakage problem.

If it is under warranty, let the shop repair it for you, and if it is an old car, it is recommended that you check frequently for leaks and repair it in time, it is better to replace the car pipe, and do some related maintenance in contact with the engine to remove rust, so at least on the road he will take you home steadily, his car is often maintained, there is nothing to open the lid, if the problem is found to be solved for the first time. There was also a leak in the fuel tank. It is important to note that the pipeline may be loose.

Once the fuel supply pump in the fuel tank leaks, it will be very serious, because there is an exhaust pipe next to the fuel tank, and the exhaust pipe of some old cars is ruptured, spewing out open flames, the consequences are unimaginable, and it should be repaired in time.

There is only one way to repair these faults, and that is to remove the engine and then overhaul it.

Usually you have to change the engine, and if you don't change it, it will eventually lead to more and more serious and even cause traffic accidents.

Then this kind of problem can't be solved by yourself, so you have to choose a repair shop to repair it, because this is still a relatively big problem.

Oil leakage from engine respirator is also often referred to as, exhaust pipe dripping oil, oil leakage, large exhaust gas, lower exhaust channeling, lower exhaust dripping oil, etc.

A respirator is a one-way valve. When the crankcase has exhaust pressure, it opens and discharges the exhaust gas outward. When there is no pressure, it closes to keep the crankcase under negative pressure, and the oil is not easy to leak, and the oil will not be discharged into the cylinder liner.

When the diesel engine is working, a small amount of high-temperature and high-pressure gas will flow into the crankcase from between the piston ring group and the cylinder wall, the valve stem and the valve guide and the supercharger bearing, which will dilute the oil, and at the same time increase the air pressure in the crankcase, reduce the power output of the diesel engine, and damage the sealing performance. The oil-air separator is mainly used to maintain the pressure balance between the inside of the crankcase and the outside of the body when the diesel engine is working, and at the same time separate the oil in the mixed exhaust gas in the first box, discharge the exhaust gas, reduce the oil leakage of the diesel engine and reduce the corrosion of parts, and improve the economy of the diesel engine. However, if the design and layout of the oil-gas separator is not reasonable, the separation system will not play the role of separating oil and gas, but will lead to undesirable phenomena such as oil channeling in the diesel engine.

Oil leakage or large amount of oil dripping from the vehicle's engine respirator (lower exhaust) is mainly caused by poor valve sealing or serious wear of the four matches.

It is normal for a small part of oil to stick to the exhaust pipe in winter, mainly because the temperature in the crankcase is much higher than the outside temperature, so when the hot gas in the crankcase reaches the exhaust pipe, oil droplets will be formed due to the temperature difference between the inside and outside, so there is oil in the exhaust pipe.

Solution: Please drive the vehicle to the service station for maintenance as soon as possible, in the driving, you must pay attention to the change in the amount of exhaust oil leakage under the vehicle, and when there is a pressure indicator alarm, you should replenish the oil in time or contact the service station directly.

Weak engine operation: Because the air sucked into the engine from the crack in the intake pipe does not pass through the air flow sensor, this part of the gas will dilute the combustible mixture in the engine cylinder, resulting in the engine running weakness symptoms. Tail gas nitrogen oxide emissions increased:

Nitrogen oxides (NOx) are formed by the reaction of nitrogen oxides (NOx) in vehicle exhaust gases in high-temperature oxygen-rich environments, and flammable gas mixtures that are too thin will contribute to the formation of nitrogen oxides, thereby increasing vehicle exhaust pollutant emissions.

An air leak is when the intake air from the engine does not pass through the throttle valve and enters the intake tract, which causes an abnormal idle speed, or an air flow sensor, which causes an abnormal signal. An engine is a machine that can convert other forms of energy into mechanical energy, such as internal combustion engines (gasoline engines, etc.), external combustion engines (Stirling engines, steam engines, etc.), electric motors, etc. For example, the internal combustion engine usually converts chemical energy into mechanical energy.

The engine is not only applicable to the power generation device, but also refers to the entire machine including the power unit (e.g., gasoline engine, aero engine). The engine was first born in England, so the concept of the engine also originated from the English language, and its original meaning refers to the "mechanical device that produces power".

The body is the skeleton that constitutes the engine, is the installation foundation of the engine's various mechanisms and systems, and all the main parts and accessories of the engine are installed inside and outside to bear various loads. Therefore, the body must have sufficient strength and rigidity. The body assembly is mainly composed of parts such as cylinder block, cylinder liner, cylinder head and cylinder head gasket.

Photo by Pacific Automobile Network Luo Ting 1).

What happens if the engine intake pipe is leaking? What happens if the engine intake pipe is leaking? Leaking air in the engine intake duct can be caused by weak engine operation and increased exhaust nitrogen oxide emissions.

The phenomenon of air leakage in the intake pipe of the engine is as follows: the engine is running weakly: the engine is suitable for both power generation and the whole machine, including the power unit.

It is the basis for the installation of various mechanisms and systems of the engine, and the main parts of the engine are all installed inside and outside to bear various loads. Therefore, the body must have sufficient strength and rigidity. The air drawn into the engine through the gap in the air intake pipe does not pass through the air flow sensor, which dilutes the combustible mixture in the engine cylinder, resulting in a sense of engine weakness.

Increased NOx emissions from exhaust gases: Because the nitrogen-oxygen bond depletion in automobile exhaust is formed by reaction in a high-temperature oxygen-rich environment, the excessively dilute combustible mixture will promote the formation of nitrogen oxides, thereby increasing the emission of automobile exhaust pollutants. @2019

Air is very important for the car engine, the engine needs a mixture of air and fuel as fuel to ensure normal operation, if the engine intake pipe leaks, the normal driving of the car has a great impact, the following explains what kinds of phenomena will occur when the car engine intake pipe leaks.

1. The leakage of the engine intake pipe will cause the phenomenon of weak operation of the automobile engine, under normal circumstances, the engine needs a fixed amount of air intake, if the air intake pipe is leaking, then it proves that the engine air intake volume will increase, and the air will be more, resulting in the perfect combination of fuel and air, then the engine will be underpowered, so the engine will feel weak during driving.

2. The leakage of the engine intake pipe will lead to the difficulty of starting the car, and the vehicle starts with a relatively high concentration of combustible mixed gas, but if the engine intake pipe leaks, it will cause the combustible mixed gas to become thinner, and it is difficult to meet the requirements of the car start, which will lead to the difficulty of starting the car.

3. The leakage of the engine intake pipe will lead to an increase in the harmful gases emitted by the car, because the flammable gas mixture that is too thin is very easy to cause the formation of nitrogen oxides, so that the car will emit more pollutants.

Air intake pipe leakage will lead to a series of failure problems, generally in this case, you need to replace the car's air intake pipe, but also check whether the air intake cushion also has a fault damage problem, be sure to repair it in time, usually check the car regularly, can better prevent the occurrence of failure problems.

Under normal circumstances, engine air leakage is caused by serious wear of the piston ring, resulting in the piston ring cannot be sealed, making the cylinder leak. It is necessary to disassemble the cylinder barrel, replace the piston ring of the same model, and then install and reset the cylinder barrel.

The sealing of the engine cylinder includes the valve, piston ring and the seal between the cylinder head and the cylinder block, etc., although the probability of air leakage in the car engine is not very large, but as a car owner, it is still necessary to master some engine leakage inspection methods to prevent the real emergency, and they have no way to start.

When checking how well the engine is working, it can be judged by feeling. When the engine is turning, bring your finger closer together to block the spark plug hole and feel the momentum of the air pressure. If the crankshaft is shaken with less effort and the gas impulse is not felt, it may be that the cylinder pressure is insufficient, and if there is a sound and the feeling of gas punching, it means that the cylinder gasket has burned through and leaked.

When the engine is running, if you hear a "shhhhh If you hear a "sigh" sound at the exhaust pipe and muffler, it means that there is a leak in the exhaust valve. (Photo by photo:.)

Wu Binbin) @2019