What are the common failures of automobile engines

Category:Automobile engine repair - Date:2017-09-05

The automobile engine is the &ldquo of the car; the heart is ” its maintenance can not be ignored. What is the common malfunction of the automobile engine? Here is a look at the relevant contents.

What are the common failures of automobile engines

(1) to launch the odor of engine room

under the influence of the high temperature of the engine, the conductors may be burnt or melted away, giving off pungent odor. The smell of engine compartment may also be a large amount of grease that is evaporated during the maintenance process and evaporated with the increase of engine temperature.

(two) abnormal lubricating oil consumption

In the course of driving, the consumption of engine oil is more than usual, driving a period of mileage, and the dashboard quickly shows the lack of oil and oil. This is usually due to the following 3 reasons: first, it may be due to the seal of the piston of the engine, which leads to the gap between the piston and the cylinder wall. Large, oil burning phenomenon. Second, it may be that the parts of the engine wear seriously, resulting in excessive clearance between parts, resulting in abnormal consumption of lubricating oil. Third, the lubricating oil used by individual engines is not up to standard, resulting in abnormal consumption of lubricating oil.

(three) engine overheating failure

because of the special structure of the automobile engine, it is easy to appear the phenomenon of high temperature of the coolant during operation. Once the temperature of the coolant exceeds the normal value, the engine can not heat properly, which will cause the engine to overheat and affect the normal operation of the engine. The main reasons for the abnormal operation of the cooling system are: thermostat failure, radiator failure, fan not turning, water tank clogging, etc.

What are the common failures of automobile engines

(four) abnormal color of exhaust gas

there is still a clear indication of the failure of the automobile engine. The engine fault is analyzed from the abnormal color of the exhaust gas. After the normal combustion of gasoline, the exhaust color should be colorless, and when the engine fails, the exhaust color will change. First, the tail gas is black because fuel is not fully burned. Second, the fuel does not meet the combustion standard, or the moisture in the gasoline will discharge the white tail gas. Third, when the color of the tail gas is blue, it may be because of the excessive wear of the piston ring or the counterpart of the oil ring, causing the oil to jump up, entering the engine combustion chamber, or the oil from the valve tube.

Maintenance strategy for common fault of automobile engine

(1) eliminate the special odor produced by the engine

During the use of the vehicle, if it is found that the engine room has a pungent odor or burning smell, it should be stopped immediately to check whether the lines are softened or burned around the engine, repair the burned or short circuited lines in time to avoid greater safety accidents. There is still a bad smell after the line fault is excluded. It should be considered whether there are factors such as the oil, heat or combustion of the foreign body attached to the surface of the engine.

(two) control of lubricating oil consumption

the normal operation of the engine will inevitably consume a certain amount of lubricating oil. The abnormal consumption of lubricating oil often corresponds to a certain malfunction of the engine. The oil consumption is abnormal. First, the oil and oil should be checked, and the lubricating oil should be replaced when necessary, so as to avoid the engine running normally because of the oil problem. After the oil problem is eliminated, the relevant parts should be checked one by one, which may cause the oil to jump into the combustion chamber because of the serious wear and tear of the parts, the oversize of the spare parts or the excessive pressure of the oil. The leakage of oil is mainly due to the aging of the gasket and the choking of the valve.

(three) monitoring the overheating of engine in time

When the coolant temperature is abnormal, it will be reported on the automobile dashboard, and when the coolant temperature is abnormal, it should be checked to see if the coolant is leaking. It should be noted that the hot car can not be shut down immediately, nor can it immediately be added to the coolant. It will wait until the engine temperature is normal. If there is a lot of coolant, troubleshooting engine thermostat and fan radiator should be checked. The problem of engine overheating requires the driver to master basic knowledge and maintenance methods. Regular maintenance and inspection of the engine should be carried out.

(four) abnormal exhaust smoke and color troubleshooting

when the engine starts to run, there will be fuel combustion, which will produce exhaust emissions. According to the color of the exhaust gas, it can distinguish some faults of the engine. When the tail gas is black, it is usually because the mixer is too strong and the fuel can not be completely burned. In this case, it is necessary to check the sensor related to the intake. When the color of the tail gas is white, it is usually because the fuel gasification is bad. It is more likely that the spark plug is discharged from the exhaust pipe without combustion and the fuel quality is bad. If the exhaust gas is blue, the problem of burning oil may be solved. It may be a problem of spark plug or valve oil seal. It should be investigated in time, and new parts should be replaced if necessary.

above, what are the common faults of automotive engines? Let's take a look at the vehicle engine maintenance program.

1. Clean the crankcase on a regular basis. During the operation of the engine, the high pressure uncombustible gas, acid, water, sulfur and nitrogen oxides in the combustion chamber enter the crankcase through the gap between the piston ring and the cylinder wall, and mixed with the metal powder produced by the wear and tear of the parts to form the oil sludge. Therefore, the crankcase should be cleaned regularly to keep the engine clean inside.

2. The maintenance of the crankcase is well ventilated. Most petrol engines now have PCV valves (crankcase forced ventilation), but the pollutants in the gas channeling will deposit around the PCV valve, which may cause the valve to be blocked. Therefore, the pollutants around the PCV valve must be regularly removed.

3. Rust and scaling are the most common problems in engine water tanks. Rust and scale will restrict the flow of coolant cooling system, reduce heat dissipation, cause engine overheating, and even cause engine damage. Therefore, we should regularly clean the water tank and remove the rust and scale.

4. Regular replacement of oil and filter cartridges. Any quality grade of oil in the process of use of oil will change, in order to avoid the occurrence of failure, should be combined with the use of regular oil change, and the oil is moderate (generally with the upper limit of the oil scale).

5. Regularly cleaning the fuel system and controlling the formation of carbon deposits can keep the engine at its best.

6. Use proper quality grade lubricants. The gasoline engine should choose SD-SF grade gasoline engine oil according to the additional equipment and use conditions of the intake and exhaust system. The diesel engine should choose CB-CD grade diesel engine oil according to the mechanical load, and the standard is not less than the manufacturer's requirements.

7. Maintenance Three filters: three filters refer to air filters, oil filters and gasoline filters. Three filters are used to filter the air, oil and gasoline on the automobile engine, which can protect the engine and improve the efficiency of the engine.

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