Tobacco products HS code verification

Engine cylinder diameter: how to measure it correctly?Tobacco products HS code verification The engine is one of the core components of the car, and its performance directly affects the power, speed and energy consumption of the car. The most basic components of the engine are the cylinder block and piston, and the cylinder diameter of the engine is one of the most important parameters. So, how to measure the cylinder diameter of the engine correctly? This article will introduce it to you. I. What is the cylinder diameter of the engine? The engine cylinder diameter refers to the cylinder diameter of the engine, that is, the standard diameter size represented by the inner diameter of the cylinder liner (inner diameter of the sleeve), which is measured in millimeters (mm). The engine cylinder diameter is also one of the important technical indicators of the engine, which has a crucial impact on the performance and service life of the engine.II. Measuring tools to correctly measure the cylinder diameter of the engine requires accurate tools. The following is a list of necessary tools: 1. Digital micrometer: the main measurement tool, which can measure accuracy below the millimeter level. Two. Oil transferer: The lubricating oil can be cleaned and the lubricating oil can be sprayed into the engine cylinder block. 3. Torque wrench: converts accurate torque into elastic moment, which is used to disassemble and install parts. Four. Cleaning cloth: clean and wipe the engine parts to ensure accurate measurement results. III. Measurement Step 1. Disassembly of the engine: First of all, the engine needs to be removed from the vehicle, and the cylinder head, intake manifold, intake and exhaust valves and other parts need to be removed for cylinder diameter measurement. Two. Clean the inside of the cylinder block: use the oil transfer to spray the lubricating oil into the inside of the cylinder block, and then useWipe the inside of the cylinder liner with a cleaning cloth. After cleaning, wipe all the oil to ensure that the cylinder is completely dry. 3. Measure the cylinder diameter: Use a digital micrometer to measure the cylinder diameter from the bottom of the cylinder liner, and then measure the inner diameter of each cylinder through the "three measurement points" method, as shown in Figure 1. Take the average of three separate measurement results, and then compare them with the standard cylinder diameter provided by the engine manufacturer to determine whether the cylinder diameter is qualified. Four. End the measurement: After measuring all the cylinder heads, clean up the cylinder head and other parts, and reinstall the engine according to the requirements of the engine manufacturer. IV. Precautions 1. Before measuring, make sure that all machine parts have been removed for easy measurement. Two. After the measurement, the cylinder block should be cleaned to avoid oil or dust affecting the performance. 3. The measured reading needs to be accurate to the third digit after the decimal point, and sometimes it needs to be measured to the second digit after the decimal point (such as 0.02mm). Four. After the measurement, be sure to check and confirm that the measurement results are accurate to ensure the best performance of the engine. V. Summarize the engine cylinder diameter is one of the most important technical indicators of the engine, which has a crucial impact on the performance and service life of the engine. When measuring the cylinder diameter, accurate tools and measurement methods are required, and some precautions should be paid attention to ensure the accuracy of the measurement results. At the same time, if necessary, professional technical support should be sought to ensure the best performance and service life of the engine.

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