China HS code interpretation guide

List of the contents of this article:

• 1, What is the impact of changing the cylinder head on the car?
• 2、 Should the engine and cylinder be replaced or repaired?

What is the impact of changing the cylinder head on the car?

Replacing the cylinder head will not affect the service life and future use of the engine. The reason for the damage of the car cylinder head is when the alloy cylinder head encounters high temperature; when the tightening torque of the cylinder head bolt is uneven; when the cylinder pad is eroded in a large area; and other external forces will cause damage to the cylinder head.

There is no effect on the replacement of the car according to the normal procedures. If it is not replaced according to the regular procedures, it may cause deformation of the cylinder head of the car. The cylinder is a metal part that guides the piston to carry out linear reciprocate movement in the cylinder. The air in the cylinder of the engine converts heat energy into mechanical energy to compress the piston through expansion.

Influential. The cylinder head assembly is one of the important components of the engine. It is directly related to the operation and performance of the engine. Replacement will reduce the probability of engine failure, but frequent replacement will affect the service life of the engine.

Replacing the cylinder head assembly of the engine is just a general maintenance project, which has no impact on the engine itself. If it is an overhaul of the car's engine, including the removal of pistons, crankshafts and other parts, adding cylinder liners and other treatments will have a certain impact on the engine.

It will aggravate the wear of the piston, piston ring and cylinder wall, resulting in a large amount of burning oil, string gas, high temperature, and burning the piston in serious cases, etc.

Can the cylinder of the car engine be repaired or replaced?

This depends on the degree of pulling the cylinder. If it is just a slight pull, it can be completely repaired.If it is a serious pull, there is no need to repair it. It is recommended to replace the cylinder block directly. The engine cylinder is caused by insufficient oil or poor heat dissipation. If you want to avoid pulling the cylinder, you need to change the coolant and oil regularly. Engine oil is known as the blood of the engine.

It is necessary to repair the engine cylinder. If it is only a slight cylinder, it is easy to repair, replace the piston and piston ring, and bring a slight grinding cylinder wall. When the groove reaches 0.15mm, polishing and repair cannot be carried out.

Therefore, the diesel engine can be repaired by replacing the cylinder liner, and the gasoline engine can be repaired by replacing the boring cylinder. After repair, it still needs polishing time, and the performance after repair is no different from the original one. If the engine cylinder is not serious, repair is a good way. The engine cylinder is a serious engine accident.

However, the failure of the engine pulling the cylinder rarely occurs, mainly because people's awareness of maintenance has been enhanced. If the phenomenon of pulling the cylinder really occurs, it is generally recommended to replace the cylinder block and piston; but now there are still a few repair shops that have the business of boring cylinder grinding shaft, so you might as well try to repair it.

"Cylinder" refers to the serious surface damage caused by the interaction between the piston and the cylinder. Most of the damage is caused by local damage to the lubricating oil in the sports part. In this case, scratches, cylinder pulling and cylinder jamming often occur.

What does Audi need to pay attention to after changing the cylinder block

1. Of course, it should be run-in. Just like the engine of a new car, it also needs to be run-in. After replacing the cylinder block, the engine can only say thatIt is better than before the repair. If the piston, valve, large and small tiles and other running-in parts are all replaced, the power and other indicators can be restored to more than 50 years of the new machine. In addition, it is also related to the maintenance and assembly technology.

2. No-load cold grinding. The engine is driven by external power. The overhead valve engine is not equipped with spark plugs or fuel injectors, and the lateral valve is not equipped with a cylinder head. The cold run-in time is generally about 2h. The starting speed of the running-in is appropriate for 60 minutes, and then gradually increase the speed. Generally, the speed per stage is 100 to 200 minutes.

3. If you need to remove the engine assembly from the vehicle, first check whether there is residual soda in the cylinder head, spiral cylinder, cylinder head holes and other holes. If there is, it should be cleaned in time and replaced with gas cylinder gas and other sealed gases. Manually rotate the crankshaft to make the piston of the engine cylinder in a compressed state.

4. It is also necessary to replace the oil pad, piston ring, piston, etc. The correct way to replace the cylinder pad is as follows: (1) When removing the cylinder head bolt, it must wait until the engine is completely cold-sealed. When disassembling, it should be loosened evenly from both sides to the middle diagonal to prevent warping and deformation of the cylinder head.

Will it affect the car after replacing the engine cylinder block?

Changing the engine has a great impact on the car. The effects are as follows: replacing the engine will depreciate the car; replacing the engine may affect the power and fuel consumption of the vehicle; the disassembly and assembly of the engine will affect the vehicle lines and other parts; the high maintenance costs of replacing the engine, etc.

Yes. For car power andThe impact of fuel consumption: There will be more or less carbon accumulation inside the old engine. Replacing the new engine will reduce some fuel consumption and increase some power, but the fuel consumption and power will also rise and decrease accordingly after the vehicle uses carbon for a period of time.

Cylinder block is a fixed part, which will not operate and friction at high speed. Theoretically, it does not need to be run-in, but in fact, the assembly tolerance of the cylinder block will also indirectly affect the cooperation of other moving parts, such as pistons, etc., so it is recommended not to drive at high speed for a period of mileage after replacing the cylinder block.

Should the engine and cylinder be replaced or repaired?

1. If the engine pulls the cylinder, the cost after micro-repair is not high. If it is not recommended to replace the engine, the repair cost will become very high.Just fix it directly. For the problem of the engine cylinder, it is best to replace it with a brand-new cylinder.

2. If the engine is too bad to repair, replacing a new engine is the best choice. However, sometimes replacing a new engine is neither practical nor cost-effective, because the overall performance of the new engine may not be comparable to that of the original engine.

3. This depends on the degree of pulling the cylinder. If it is only a slight pulling cylinder, it can be completely repaired. If it is a serious cylinder pull, there is no need to repair it. It is recommended to replace the cylinder block directly. The engine cylinder is pulled by insufficient oil or poor heat dissipation. If you want to avoid pulling the cylinder, you need to change the coolant and oil regularly.

4. If the engine cylinder is not serious, repair is a good way. The engine cylinder is a serious engine accident.