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The engine is the "heart" of the vehicle, and the hot summer is the peak of the "heart". If the owner does not pay attention to the maintenance of the "heart" in the summer, it is not only easy to cause armpits of the vehicle, but also may endanger the personal safety of the passengers. In order to prevent the "morbidity" in the summer, the reporter invited industry experts to give the driver's friends a "good recipe" for summer engine maintenance.
Pay attention to water temperature prevention "open pot"
One of the safest hidden dangers of passenger car engines in summer is that the water temperature of the water tank is too high. If it is allowed to develop, it will cause the water tank to “openâ€, which is what the driver's friends often say “the water in the tank boiled into boiling waterâ€. The occurrence of such failures will lead to increased wear of engine components, light engine pull, pull the engine, while the entire engine is damaged or even scrapped. Once the “open pot†phenomenon occurs, if you continue to drive, it will not only cause damage to the vehicle, but it will also lead to a very difficult direction and can easily lead to accidental traffic accidents.
In an interview with the reporter, Zhu Kechang, FAW Xichai Training Section, stated that the reasons for causing the engine to boil were mainly the following. The first is the “innate factor.†Most of the passenger cars on the market currently use rear-mounted engines. This type of rear-mounted engine has a poorer ventilation environment than the front-mounted engine. In the high temperature environment in summer, the temperature of the water can easily rise, thus triggering the “open potâ€. In addition, the engine often undergoes rigorous high-temperature testing before leaving the factory to ensure that it operates properly under high-temperature conditions. However, when entering the vehicle assembly process, factors such as the size of the water tank, the design of the cooling air duct, and the diameter of the fan will directly affect the heat dissipation of the engine. If the above factors are unreasonably designed, it will seriously affect the normal heat dissipation of the engine and cause the temperature of the water tank to go over. high. Followed by the "acquired" man-operation reasons, that is, bad driving habits. For example, in the driving process for a long period of time, "low-speed high-speed running", long-term high-load passenger cars can easily lead to "open pot" phenomenon.
In order to prevent the phenomenon of “open potâ€, the driver must pay attention to the water temperature displayed on the instrument panel while driving. If the water temperature is too high, the flame should be turned off immediately to allow the engine to rest. Regularly check whether the vehicle is in the “oil shortage†or “less water†condition and check the tightness of the fan belt. Once the phenomenon of “open pot†occurs, the driver should immediately stop, but do not turn off immediately. Let the engine run at idle speed, open the engine cover to accelerate heat dissipation, and add enough cooling water when the temperature drops. Secondly, do not immediately open the tank cover and add water. Because the pressure in the tank is very high, once the lid is opened, boiling water can easily burn the driver. Again, you can't use cold water directly on the engine, otherwise it will cause the cylinder block, cylinder head suddenly cold burst or deformation.
Selecting the key to oil
Customer Service Manager Guo told reporters that the summer engine must use summer oil, the general range of summer oil is -15 ° ~ 55 °, such as the use of winter oil may reduce the oil pressure, causing accelerated wear. In addition, the viscosity of the machine decreases with the increase of temperature, which may cause the lubricant to be consumed too quickly. The high temperature also accelerates the decomposition and oxidation of the engine oil. At the same time, the engine runs at a high temperature, the thermal expansion of the metal parts is large, the normal fit gap between the parts becomes smaller, and the wear increases. As the engine overheats, the oil becomes thin, the oil pressure decreases, the lubricant film is not easy to form, and the wear of the engine is also accelerated.
Therefore, summer oils with higher viscosity should be replaced in the summer and oil and oil quality should be checked frequently. Especially during long-distance driving, pay attention to the oil temperature gauge. If the oil temperature is too high or there is not enough oil, check it in time. It is important to note that if the vehicle has just been overhauled in summer, low viscosity oil should be used. Because after overhauling, the pressure relief of the vehicle is reduced, the use of low viscosity oil is beneficial to heat dissipation and filtering of metal abrasive grains, which facilitates quick access to the lubrication area. For overhauled vehicles, if high-viscosity oils are used, early wear, engine burns, cylinder pull-ups, and other problems can easily occur.
Li Jianlong, deputy general manager of Suzhou Lili Technology, told reporters: In the summer, special attention should be paid to the engine cooling system to ensure its normal operation. Because the ambient temperature is relatively high, the engine is prone to high temperatures. If the engine is often in a high-temperature working state, it is easy to cause the early oxidation and deterioration of the lubricant, the viscosity decreases, and the lubrication function is lost. The ATS system is recommended. The ATS is a constant engine water temperature and does not change with the temperature of the weather. It can effectively reduce the temperature of the engine compartment and does not affect the opening of the air conditioning unit.
In addition, the surface of the heat exchanger should be cleaned to check the working conditions of the various parts, adjust the belt tension, check the tightness of the “anti-hot air return†device, check the sealing pressure of the water system (check the pressure cover), and replace the aging Hose.
Gas bus to prevent leakage
Every summer, there is an accident of spontaneous combustion of the vehicle. Therefore, attention should be paid to the “firefighting†of summer vehicles. For gas buses, due to the influence of the weather, the temperature gradually rises, and the joints of the gas cylinders and connecting pipelines of gas vehicles vary greatly from winter to summer, and the expansion coefficient of the pipeline joint materials is liable to change, which in turn causes long-term bumps. Vibration, easy to loose or even leak, encounter an open flame, there may be a fire accident. Therefore, the summer maintenance work for gas buses should start with preventing leakage.
Zhu Kechang, FAW Xichai Training Section, told reporters that in fact, the maintenance of gas buses is not as complicated as everyone thinks. Drivers should use the same gas as the ones used in their daily homes. They should keep the vehicles away from the heat and fire in summer. Ventilation, before each start, after parking, use soapy water to carefully inspect the pipe joints for leaks to ensure the safety of driving in summer. In addition, it is necessary to ensure the stability of gas passenger gas pressure, so that the gas cylinder is within the normal pressure range. Once the pressure bottom line is reached, it must be inflated in time.
In the use of engine oil, gas is also different from diesel vehicles. Natural gas is a gaseous fuel, and no dilution of engine lubricating oil occurs during use. Therefore, a lower viscosity lubricating oil can be used, which can reduce the power loss caused by viscosity and improve the efficiency of the engine. At the same time, special engine oils for natural gas vehicles can be used. This special oil can effectively prevent corrosion and wear of components such as valves and piston rings and prevent power loss caused by cylinder pressure drop.
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