In order to meet people's needs, cars are produced and used on a large scale. However, with the long-term use, different cars will have different use problems.
If the car is not effectively repaired and maintained, it will not only reduce the service life of the car, but also lead to accidents.
In order to solve these problems, the common automobile faults and their causes are deeply analyzed, and the related skills of automobile machinery maintenance are explored.
The exhaust pipe emits black smoke.
It shows that the mixture is too rich and the combustion is incomplete. The main reasons are overload of automobile engine, insufficient cylinder pressure, low engine temperature, improper adjustment of carburetor, blockage of air filter element, failure of individual cylinders and late ignition.
When disassembling, check whether the choke valve is fully opened in time and carry out maintenance if necessary; After flameout, look at the main nozzle from the mouth of the oiler. If oil is sprayed or dripped, the oil level in the float chamber is too high, so it should be adjusted to the specified range, and the main metering hole should be tightened or replaced. The air filter is blocked and should be cleaned, dredged or replaced.
During operation, the engine temperature suddenly becomes too high.
If the coolant thermometer shows that the vehicle will soon reach the position of 100℃ when driving, or when the cold car starts, the engine coolant temperature rises to boiling rapidly, and returns to normal after replenishing the coolant, but the engine power drops obviously, indicating that the engine mechanical system has failed.
Serious leakage of cooling system; Flush the isolation water jacket and cylinder gasket of the cylinder; The thermostat main valve falls off; The fan drive belt is loose or broken; Pump shaft and impeller are loose; The fan clutch is not working properly.
Check the cause of failure, and make corresponding repair and replacement.
It smells bad to turn on the air conditioner.
The refrigeration principle of air conditioner is to absorb heat through the rapid evaporation of refrigerant, so that the temperature of air flowing through it drops rapidly. Because the evaporator temperature is low and the air temperature is high, water molecules in the air will condense into water droplets on the evaporator, while dust or clothes in the air.
Small fluff and other substances on the seat are easy to adhere to the surface of the condenser, which leads to mildew and bacteria will multiply.
Long-term inhalation of this air by human body will affect the health of drivers and passengers, so the air conditioning system should regularly replace the air conditioning filter and clean the air duct.
The steering wheel of a vehicle is always misaligned.
Many car owners may find their steering wheel drifting from left to right, especially on the highway. If it is ruled out that the speed is too fast and there is a phenomenon of grabbing the disk, this is the real car fault.
This is because the rubber stopper fixed in the groove of the steering gear has been completely damaged. After installing a new limit block, the fault completely disappeared. Generally speaking, this kind of fault can only be solved in the repair shop, except for the expensive disassembly fee, which is basically worthless.
When the car accelerates, the oil pressure indicator will light up.
There are two kinds of oil lamp lighting: real and imaginary. The so-called reality is that the oil pressure is so low that the indicator light gives an alarm, indicating that the lubrication system is indeed faulty and must be eliminated.
The so-called virtual, as suspected, the oil lubrication system did not fail, but the oil pressure indicator system failed and the indicator light was in the wrong place.
Although this kind of fault will not affect the normal operation of the engine, it is good to find the root cause and eliminate it in time.