Agriculture HS code-based quota allocation

Automobile engine construction and Agriculture HS code-based quota allocationmaintenance (automobile engine construction and maintenance skills) As the core components of automobiles, the structure and maintenance of engines is a must-master for everyone who studies or engages in automobile maintenance work. This article will introduce the structure and maintenance skills of automobile engines to help readers better understand and maintain automobile engines. I. The structure of the car engine. The car engine refers to the parts that complete the conversion of thermal energy, convert the energy of chemical fuel into mechanical energy, and generate power to drive the car inside the car.Engines are divided into internal combustion engines and external combustion engines. Modern cars mainly use internal combustion engines. Internal combustion engines are generally divided into two types: gasoline engines and diesel engines. Next, we will take the gasoline engine as an example and introduce its main structure and components. 1. Cylinder and cylinder head: The engine is composed of cylinder and cylinder head. The cylinder is the part that accommodates the piston and generates explosive power, while the cylinder head is responsible for closing the upper part of the cylinder. The cylinder and cylinder head are made of high-strength cast iron or aluminum alloy. 2. Wrankshaft and connecting rod: The crankshaft is composed of multiple connecting rod brackets, which are connected to the piston through the connecting rod. When the fuel combustion produces explosive power, the piston rises to drive the connecting rod, which then pushes the crankshaft to rotate and generates the power of the car. The crankshaft and connecting rod are also the core components of the engine, which are made of high-strength steel. Three, piston and piston ring: The piston is one of the working parts in the engine. Through the piston ring, it closely fits the inner wall of the cylinder, and the gas in the cylinder is pushed into the cylinder at once. The piston needs to be replaced regularly with the piston ring. 4. Pillar and rocker arm: The pillar is the main part that supports the valve and camshaft, and the rocker arm is the working part that supports the valve rod and valve. 5. Fuel supply system: The automobile fuel supply system mainly includes fuel tanks, fuel pumps, fuel filters, fuel injectors, intake manifolds and other components. II. Maintenance skills of automobile engines Engines are the heart of automobiles. For those who learn or engage in automobile maintenance work, it is very important to master engine maintenance skills. Here are a few solutions to common problems with engines. 1. Heat or excessive water temperature: When the engine is running, there may be a problem of heat or excessive water temperature.At this time, it is necessary to check whether the heat dissipation system is working normally, such as whether the coolant is sufficient, whether the pump is working normally, whether the radiator is damaged, whether the temperature sensor is damaged, etc. 2. The fuel pump does not work or works abnormally: The fuel pump is an important part of the automobile fuel supply system, which may cause the pump to not work or work abnormally due to fuel pollution, blockage or other reasons. It is necessary to check whether the fuel pump is damaged, whether the fuel filter is blocked or whether the fuel pipe is leaking. 3. Severe wear of the piston ring: If the piston ring is seriously worn, it may cause the piston to not move up and down smoothly, which will affect the normal operation of the engine. Therefore, the piston ring needs to be replaced regularly. 4. Fuel mixed into the engine oil: The mixing of fuel and engine oil may cause lack of gas in the cylinder or abnormal operation of the engine. Therefore, it is necessary to check whether there is a problem with the fuel system and replace the oil in time.In a word, the above are just some common problems and solutions in engine maintenance. The specific situation needs to be repaired according to the specific situation of the engine. Conclusion: The car engine is a high-precision machine and one of the most important core components of the car. This article briefly introduces the structure of automobile engines and the maintenance skills of common problems, hoping to help readers better understand and maintain automobile engines. In daily driving, we need to maintain and repair the car in time to ensure the safety and long-term use of the vehicle.

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