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When all types of engines are working, due to the influence of relevant factors, they all generate carbon deposits more or less. Coking is the product of fuel or lubricating oil formed under the effect of high temperature and oxygen. When the engine is working, fuel or lubricating oil intruded into the combustion chamber cannot be 100% burned. The unburned part of the oil forms hydroxy acid and resinous gums under the high temperature and oxygen catalysis, and adheres to the surface of the parts. After high-temperature action, it is further reduced into a complex mixture of asphaltenes and oil coke, known as coke. The carbon deposit on the cylinder head reduces the cooling effect of the engine. Because the thermal conductivity of coke is extremely poor, its thermal conductivity is only 1/50 of that of cast iron or steel, which can cause the engine to overheat, which greatly reduces the power and economy of the engine. The coke on the top of the piston will form many hot surfaces, causing premature combustion and deflagration; at the same time, the coke on the top of the piston and the cylinder head will increase, the volume in the combustion chamber will decrease, the compression ratio will increase, and it will cause engine deflagration, knocking, knocking and abnormalities. Wear, shorten the life of the engine. Accumulation of carbon deposits on the face of the valve and the seat ring can result in loose valve closure and air leakage. This can lead to engine failure, inability to work, and valve ablation. The carbon deposits of the valve guides and the valve stems will accelerate the wear of the valve stems and the valve guides, and may even cause the valve stem to move in the valve guide to cause astringent and stuck. The carbon deposit in the piston ring groove will make the piston ring flank and backlash smaller, even without clearance; the end gap is affected by coke and there is no expansion clearance. At this time, it is very easy to cause the piston ring to lose its elasticity, the cylinder seal is not strict, and even to break the piston ring and pull the cylinder. The fuel injectors have accumulated carbon deposits, which can easily seize the fuel injector and cause the engine to suddenly stop. The pre-combustion chamber starts with a hole in the coke that will clog the nozzle, making it difficult to start the engine. Excessive carbon deposition of the spark plug, after the fuel is wet, is equivalent to the parallel shunt resistance between the electrodes of the spark plug, resulting in leakage of the spark plug and excessive flashover. In severe cases, the spark plug cannot work. When the carbon deposition on the inner wall of exhaust passages and exhaust mufflers is severe, the exhaust resistance increases, and the exhaust gas is not net, causing the engine temperature to rise and the power to drop. When the engine generates carbon, it should be eliminated in time. Manual removal (wire brush or blade) is generally used, but it is also possible to remove the piston ring manually on the surface of the combustion chamber and the top of the piston. For the carbon deposit in the muffler, if it is inconvenient to disassemble, the muffler can be placed in the fire to burn red, and then quickly cooled. Then the wood stick can be tapped and shaken to make the coke fall off. For the carbon deposit in the combustion chamber, it can be completely eliminated chemically if conditional. When removing carbon deposits on steel parts (such as cylinder heads, valves), use caustic soda 25g, sodium carbonate 31g, sodium silicate 10g, soap 8g, dichromic acid 5g, water 1000g to form a cleaning liquid and heat it to 70~ 80 °C, the parts into the cleaning solution soak for about 30min, so that the coke softened and removed, and rinse with hot water. When clearing carbon deposits on aluminum alloy parts (such as pistons, aluminum cylinder heads), use sodium carbonate 20g, sodium silicate 8g, soap 10g, potassium dichromate 5g, water 1000g as a cleaning solution, and heat the solution to 70 ~ 80 °C, the parts into the cleaning solution soak 30min until the coke softened and cleared, and rinse with hot water. The metal cleaning agent is a cleaning and decarbonizing agent with strong descaling ability. For the parts with serious carbon deposition, in order to increase the removal effect, other components can be added to the metal cleaning agent to prepare an aqueous solution. The formula is: metal cleaning agent 40g, hydroxide 12 g of sodium, 12 g of sodium silicofluoride, 12 g of sodium pyrophosphate, 10 g of sodium trimerate, and 1000 g of water were prepared as a solution, which was heated to 70 to 80° C. and soaked and removed. To prevent engine coke formation, the following aspects should be taken into account: (1) Keep the cylinders well sealed; (2) Fuel atomization should be good; (3) Intake and exhaust ports should be kept open; (4) Gas distribution phase, supply The oil time should be accurate; (5) spark plug flashover voltage should be normal; (6) the engine temperature should be normal; (7) choose the fuel that meets the specifications of the grade; (8) the correct use of the vehicle to avoid long-term overload, avoid the fierce Throttle; (9) Maintain and maintain the vehicle in time to keep the engine in good technical condition. Author: Heilongjiang Agricultural Reclamation Vocational and Technical College