HS code harmonization in NAFTA region

Disassembly and HS code harmonization in NAFTA regioninstallation of the engine - how to operate it correctly? Disassembly and installation of car engines is the most common and important task in car repair, and it is also one of the most basic skills. If you want to be an excellent car repair engineer or want to repair a car by yourself, this skill is indispensable.However, the wrong operation of disassembling and installing the engine may also lead to irreparable consequences, so you need to be careful when operating. Next, let's learn how to properly disassemble and install the car engine. 1. Preparations need to be made before starting to disassemble and install the engine. First of all, you should choose a good tool, and the choice of tools should be careful so as not to affect the efficiency of disassembly and installation. Secondly, if you want to buy relevant parts, if you can't buy the required parts in time, you need to book in advance or manufacture them yourself. In addition, the engine should be thoroughly cleaned before operation, and the work site should be carefully cleaned up after disassembly and assembly. Necessary protective measures cannot be ignored, including wearing appropriate safety equipment and placing appropriate firefighting equipment. Two. Step-by-step disassembly of the engine needs to be carried out step by step. First of all, disassemble the parts associated with the engine, such as generators, starters, air conditioner compressors, etc.Then the hood, radiator and cooling fan need to be removed. Then remove the front accessory cover, remove the engine timing system part and the valve duct, etc. Finally, it is necessary to remove various main components such as fasteners, engine bottom shell and crankshaft. 3. Precautions When disassembling and installing, you need to pay attention to the following points: (1) Do not use too much force: just use appropriate force to disassemble or install parts. Excessive use of force not only wastes energy, but also easily damage parts or tools. ( 2) Do not forcibly disassemble: If you encounter parts that are difficult to disassemble, do not forcibly disassemble, which will damage the parts or cause danger. ( 3) Be sure to pay attention to the marking: During the disassembly process, you should carefully follow the marking to avoid the wrong position of the parts or the opposite direction. ( 4) Don't underestimate the details: some seemingly unimportant widgets also need to be paid attention to. The mistakes of these widgets may cause great damage.(5) Pay attention to time: The disassembly time of each automobile manufacturer is different, so it is necessary to know the disassembly time of each part. It is better to have relevant maintenance manuals or data to better grasp the time. Four. When lifting correctly for disassembly and installation, you need to use the corresponding lifting equipment, such as cranes, jacks or slats, to lift the engine. When using lifting equipment, make sure that the equipment is durable and solid. The lift needs to be locked on the engine and bracket to ensure safety. When lifting and placing the engine, pay attention to the balance of the engine to ensure that it is not tilted or dumped. 5. The timing of disassembly. Dismantling the engine is a huge task, and in some cases, it does not require complete disassembly. Therefore, there is a time to disassemble the engine. For example, when replacing the oil pump and repairing crankshaft mechanical parts, only the chassis and oil sup can be disassembled and installed;When checking the compressive strength of the cylinder and replacing the piston ring, just remove the cylinder head. In some other cases, it is necessary to completely disassemble the engine to replace some major parts or carry out major repairs. At this time, it is necessary to choose flexibly according to the situation. 6. Disassembly manual Finally, the disassembly manual is the key for repairmen and DIYers who are not familiar with disassembling and installing car engines. The disassembly manual is very detailed about the disassembly process, and each manufacturer has its own manual. The manual includes detailed guidance on disassembly, assembly and adjustment of the engine, as well as suggestions for checking engine tanks, oil pumps, pistons and other parts. The manual is the most important tool to understand and master the disassembly and installation of the engine. Summarizing the disassembly and installation of automobile engines is one of the most basic tasks of automobile maintenance, which involves many specific details and key points. In order to be correctDisassembly of the engine, before operation, you need to prepare for the work, disassemble the engine step by step, pay attention to the precautions and disassembly time, raise the engine correctly, and choose to use the corresponding tools, equipment and disassembly manuals for guidance according to the situation. Only by focusing and careful, reasonable and scientific operation can we successfully disassemble and ensure the safety of the engine.

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