Why does the car Anchai engine oil emit black smoke after maintenance

1. Reasons. 1.The flammable mixture is too thick.

2.There is too much oil in the engine fuel. 3.

Poor piston ring or crankshaft oil seal sealing. 4.There is moisture in the fuel.

5.Bad spark plug 6The air filter is too dirty.

2. Fault diagnosis and elimination.

1.For the inspection and diagnosis of excessive concentration of combustible mixtures, the carburetor and air filter should be checked.

2.The blend does not compare with the blend of the oil, or the wrong grade of oil is used. If the oil mixture contains too much oil or the oil quality is poor, the oil of the flammable mixture cannot be completely burned, resulting in black smoke.

The above phenomenon can also occur in two-stroke engines with separate lubrication and oil pump misalignment and excessive oil supply. At this time, the oil pump should be checked and adjusted according to the regulations to ensure that the lubricating oil is supplied proportionally at different throttle openings.

3.Excessive wear or breakage in a four-stroke engine, as well as too much oil in the crankcase, can cause oil to string into the combustion chamber and cause excessive oil in the mixture. If the crankshaft oil seal of a two-stroke engine is broken, it will also cause the oil from the transmission to string into the crankcase and enter the combustion chamber with the mixture.

4.One of the reasons for the mixing of water in the fuel is that the fuel in the fuel tank itself contains water, so the fuel tank should be cleaned and the fuel should be replaced. Another reason is that the cylinder gasket of the water-cooled engine is broken, and cold water enters the cylinder.

If, in the absence of leakage, the water in the tank is consumed too quickly, and the exhaust smoke from the exhaust pipe is slightly white, this is mostly the reason and the head gasket should be replaced.

Black smoke from gasoline engines is rare, black smoke is mainly not completely burned fuel in the combustion chamber, in the case of high temperature and lack of oxygen, diesel can not be completely and fully combusted, so decomposition and aggregation to form soot, it is a small diameter of the aggregate.

Because this aggregate reacts much slower than gasified fuel, due to the high temperature and anoxic environment of the combustion chamber, it cannot be fully burned again and is discharged through the exhaust pipe, so black smoke is presented.

The direct consequence of this phenomenon is that the fuel consumption of diesel engines is very high, the power is reduced, and at the same time, a large amount of carbon deposits exist in the piston and piston ring valves. In severe cases, the piston rings will be jammed, the valve seal is not tight, and the air leakage will be accelerated, and at the same time, it will also accelerate the wear of parts, thereby reducing the service life of the engine, so this aspect should be paid special attention.

Oil spills. There are usually several reasons for oil leaks:

1. Valve oil leakage, valve oil leakage is generally because the valve is blocked or damaged, and the solution is to replace the valve.

2. The joint is loose, and the solution is to tighten the joint or replace the joint.

3. That is, you have problems with the pump and hydraulic oil pipe.

Changing the engine oil is based on the use of the engine oil to decide whether it needs to be replaced, the oil is dropped on a piece of white paper, and then according to the oil color change judgment brother luck chart for the identification of oil use. With constant use, the oil will slowly deteriorate and be mixed with impurities.

1.Fully synthetic engine oil: Fully synthetic engine oil has better high and low temperature performance, longer oil replacement cycle and is suitable for more severe car conditions, suitable for luxury high-performance vehicles, and is replaced at about 10,000-12,000 kilometers.

2.Semi-synthetic engine oil: The replacement cycle of semi-synthetic engine oil is generally about 8000-10000 kilometers, and the performance is moderate.

3.Mineral oil: This type of oil generally needs to be replaced after about 5000 kilometers.

Try to choose multi-grade oil, multi-grade oil has a good protective effect on the start of the beam machine due to saving, long life and high efficiency. Due to the characteristics of multi-grade oil, there may be premature blackening and less oil pressure than ordinary oil during use.

Seven causes of black smoke.

When the vehicle leaves the factory, the smoke degree has been tested to meet the relevant standards, and it will not emit black smoke under normal use conditions, and the diesel engine will emit black smoke only when it is overloaded. If the diesel engine emits black smoke when it is running at no load or light load, or if it emits too much black smoke when it is under heavy load, it is not working properly.

1. Poor work of the injector: poor atomization or dripping of oil injector of large pump truck, especially obvious at low speed of diesel engine, the lower the speed, the greater the smoke, you can use the single-cylinder oil cut-off method to find cylinder by cylinder, when temporarily stop supplying oil to a cylinder, the phenomenon of black smoke is reduced or disappears, and under the normal operation of the fuel injection pump, it can be judged that the cylinder injector is faulty. The injector parts should be cleaned, ground or replaced separately according to the situation.

It is not only large pump trucks that emit black smoke, but after the emission upgrade, the vehicle has more EGR systems, such as uneven fuel supply, premature injection time, and insufficient atomization. If the EGR valve fails and is not closed tightly, exhaust gases will enter the engine while the vehicle is driving or idling. When the exhaust gas is mixed in, the air content on the intake side of the cylinder decreases, resulting in a decrease in oxygen, and the carbon content in the exhaust gas is increased due to insufficient fuel combustion, and the exhaust gas turns black.

2. Improper adjustment of the advance angle of oil supply: the advance angle of oil supply is too small, the aftercombustion increases, and the fuel cannot be completely burned, forming carbon smoke and discharge, resulting in black smoke from the exhaust. At this time, the oil supply advance angle should be adjusted to the appropriate position.

3. The fuel supply of the fuel injection pump is too large: the oil supply is too large, the black smoke is continuous, and the larger the throttle, the greater the black smoke, which can be checked by the broken shed buried oil method, when a cylinder is stopped, if the smoke disappears, under the normal working condition of the injector, it can be concluded that the oil supply of the cylinder is too large, and the oil supply of the cylinder should be appropriately reduced, and the fuel injection pump should be removed if necessary, and the test bench is debugged. The reason for the excessive oil supply is that there is an error in the correction of the fuel injection pump, resulting in excessive oil volume; The oil volume adjustment screw of the oil pump is loose, so that the oil volume increases; The timing screw on the tappet of the fuel injection pump is loose, and the interval angle changes the chain; The smoke limiter comes off and emits a lot of black smoke when it starts.

4. Air filter blockage: After the air filter element is blocked, the air intake of the diesel engine is reduced, and the same amount of diesel fuel is injected into the cylinder, and there is not enough air to mix with it, and the diesel fuel cannot be fully combusted, resulting in black smoke. The air cleaner cartridge should be replaced.

5. Excessive load of diesel engine: when the vehicle is accelerating, climbing or overloaded with diesel engine, the diesel fuel injected into the combustion chamber increases, but too much diesel and air are mixed unevenly, and it is still inevitable that there will be insufficient local air combustion. Overloading the vehicle during operation should be avoided as much as possible.

6. Poor diesel quality: the diesel engine uses inferior diesel, or the diesel contains other impurities in the fuel, so that the combustion is not sufficient and the black smoke is discharged.

7. Other reasons: insufficient compression ratio, too large or too small valve clearance, valve stickiness or poor sealing of valves and valve seats, wear and tear of piston rings and cylinder liners, etc., are all important reasons for the black smoke of diesel engines.

Does the black smoke of the diesel engine have anything to do with the oilHello, the black smoke of the diesel engine is related to the oil, the valve, piston ring, and cylinder liner are worn out, which causes the compression pressure to be insufficient and the oil is channeled on the combustion chamber to dry, so that the cylinder changes the normal proportion of the mixture at the end of the compression stroke, so that the fuel burns under oxygen-free conditions, and the combustion process is easy to produce carbon deposits, and the exhaust gas discharged forms a large amount of black smoke. If it is confirmed that the reason for the black smoke of the diesel engine is caused by the wrong wide angle of the fuel supply, as long as the oil supply angle is adjusted to the design angle, the fault can be eliminated.

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The reason for the black smoke emitted from the oil pool of the diesel engine is the insufficient compression force, after the valve, piston ring and cylinder liner are worn, the compression pressure is insufficient, the pressure and temperature cannot meet the requirements, and the combustion conditions of the fuel deteriorate to produce soot; 2.The shape of the combustion chamber and the volume of the combustion chamber have changed, and the shape of the combustion chamber has decreased due to the manufacturing quality and long-term use, which has affected the mixed quality of fuel and air and produced black smoke.

It would be better to change the oil. Normally, when the car oil is just replaced, it is yellow and translucent, and it is generally added with a clean and calling dispersant, the purpose is to wash the paint film and black carbon deposits adhered to the piston, and disperse it in the oil to reduce the generation of high-temperature deposits in the engine, the more dispersants, the better the dispersion, the less the paint film, but the easier the oil is to turn black, so often some oils with strong cleaning ability will turn black faster than other oils with weak cleaning ability. Whether the lubricating oil in use is badly deteriorated and needs to be replaced, it is not observed that the color of the oil in the machine mill has turned black, and it is concluded that it needs to be replaced.

1. Fuel quality, the higher the olefin content in the fuel, the higher the sulfur content, the easy formation of sludge in the gasoline engine, the formation of soot in the diesel engine, and the easier it is to turn black in the oil. Therefore, the choice of engine oil has become particularly important, brand engine oil should be the first choice of our riders, and You Hong Kunlun lubricating oil is very good, has been used.

2. The engine structure and working conditions are different, and the sludge in the oil pan of the engine engine is mainly caused by the car starting, stopping, and stopping, and the horsepower is not fully utilized and the combustion is not complete; Diesel engines do not burn completely to form soot, which causes the oil to turn black easily.

3. The engine is overloaded, high-power, and high-temperature operation for a long time, which makes the oil oxidize and turn black.

4. Change the engine oil without cleaning the engine or replacing the oil filter.