There are mainly two different opinions on engine cylinder pulling in the market. One is the strain caused by engine oil, the other is the strain caused by carbon deposition, which is caused by carbon deposition or engine oil.
Let's interpret it from two aspects. Broadly speaking, there are two kinds of cylinder pulling: one is serious cylinder pulling and the other is slight cylinder pulling.
Severe cylinder pulling
Dense, fan-shaped strain occurs in the whole cylinder, which has a wide area and high density and belongs to serious strain. In this case, only the engine can be overhauled and the cylinder liner drilled again, which will lead to serious fuel consumption. There is no other way, overhaul is the only way.
Slight cylinder pulling
The other is that there are several vertical black or metal hook marks on the cylinder wall, which is a slight strain.
Causes of cylinder pulling
1, cylinder pulling is serious.
Let's talk about the first kind of serious strain. In fact, there are three main reasons for serious tension:
Reason 1: We used oil improperly. For example, we use No.20 oil, and we use No.30 oil. At this time, the cylinder wall will be severely deformed. For example, the Land Rover engine now requires 0-20 oil, and we use 30 oil. As long as you add 30 # oil and drive back at a high speed of 300 kilometers, there will be serious cylinder pulling.
Reason 2: There is a serious shortage of oil. For example, this car doesn't burn oil, but it suddenly burns oil, but we don't know if this car has an oil warning system. Without knowing it, the oil dipstick can't reach the oil at all. After a period of time, the oil lamp will give an alarm. At this time, the cylinder wall is prone to serious strain, because the temperature is too high due to insufficient oil.
Reason 3: insufficient antifreeze, or the problem of the whole antifreeze circulation system, resulting in excessive engine temperature, pull. The above three points are the reasons for the serious strain of cylinder wall. ?
Severe cylinder wall wear and strain may cause abnormal engine noise or idling noise, but as we often use the car, we are a little familiar with this sound, and as the owner, we may not hear it at ordinary times.
2. Slight cylinder pulling
Let's talk about minor strain first, which is actually very easy to understand. Mainly related to carbon deposition. For example, if there is too much carbon deposit on the top of our piston, it will sink to the position of this gas ring or oil ring at this time, so that the gap between the cylinder wall and the piston will be covered by carbon deposit, and the piston will be pulled by the black vertical bar when running.
In addition, there is another possibility that the deposited carbon does not sink much, but just concentrates in a certain part, so there will be some metal groove-shaped vertical bar scratches on the cylinder wall at this time. In fact, the above two strains are not serious strains, and many cars will appear, mainly because they have not cleaned the oil circuit effectively for a long time, especially because they have not used PNF technology cleaner to clean the oil circuit, and the quantitative change is qualitative change. It should be noted here that once this strain is found, it is necessary to think that this engine may have started to burn, or this engine may burn oil soon.
This is a clear signal, whether all engines will have this slight strain when burning. No, for example, many Volkswagen Audi cars don't have this kind of strain, but they burn a lot of oil, so they will burn oil without pulling the cylinder wall, but pulling the cylinder wall will definitely mean that they have burned oil, or will soon start to consume a lot of oil. Therefore, we should pay enough attention to seeing slight stretch marks.
How to solve the cylinder pulling problem?
There is a serious strain on the engine cylinder wall, so it is necessary to replace the cylinder liner for overhaul, while several vertical bars are slightly strained, so there is no need to overhaul the engine.
Let's look at a case. For example, Korean engines produced earlier, including Kia Hyundai, have no fuel injection system in each cylinder, that is, the fuel nozzle. The function of the injector is to spray oil on the piston skirt, that is, to the lower part of the piston of each cylinder.
In order to keep the engine oil lubricated and ensure the thermal stability of the engine at the same time, that is, when it is sprayed on the cylinder wall, the engine oil will take away a lot of heat and prevent the engine from overheating. But in the early years, these engines did not have this device, which would cause a lot of cylinder pulling, that is, high temperature. At that time, even if the new car used good engine oil, it would have serious wear and tear from 80 thousand to 90 thousand kilometers, and the problem could be solved by overhaul. In the later period, this design defect was made up. An oil nozzle is installed in each cylinder block to spray upward to accelerate lubrication and cooling.
How to prevent cylinder pulling?
How to effectively prevent engine cylinder wall strain? Because a serious strain on the cylinder wall is bound to burn engine oil, it may slightly remind us that engine oil is about to start burning or has already started burning engine oil. Then at this time, as long as the core problem of cylinder wall strain is solved, the problem can be avoided. So where is the core problem? For example, the poor performance and insufficient lubrication we just mentioned are actually high temperature, insufficient antifreeze or problems with the antifreeze circulation system. It also points to high temperature, including improper use of oil in that year, which will be so high.
For example, the heat dissipation of 20 engine oil is actually better than that of 30 engine oil, so if you use high viscosity engine oil, it will also lead to too high temperature, burning engine oil, and even its higher viscosity will lead to turbine problems, crankshaft problems and crankshaft tile problems, so it is unwise for many cars to increase the viscosity of engine oil after burning engine oil.
Because after increasing the oil viscosity, you can only see that the oil consumption seems to be less for a period of time, but other serious losses caused by the engine are irreversible. Even in the end, high-viscosity engine oil will inevitably cause serious strain, so you should overhaul it if you want, because the essence of our practice of increasing engine oil viscosity is not to overhaul the engine to alleviate and cover up the problem of burning engine oil. However, because the viscosity of engine oil was increased at will, in the end, it was actually necessary to adopt the method of overhaul, which was really not worth the candle.
Protect against high temperature.
The word "high temperature" is so important in the whole engine. How to prevent high temperature?
The combustion temperature in the engine is the highest, such as 1500~2500 degrees. Determine the temperature according to the characteristics of different engines. If the oil circuit is kept clean and in good condition at ordinary times, the combustion temperature will be relatively lower by several hundred degrees. With the change of car service time, it will produce completely different results.
For example, some engines often burn oil at 70,000-80,000 km during short-distance driving, but if you often carry out effective oil circuit, it is very likely that there will be no serious oil burning at150,000-60,000 km. Therefore, when using cars in China, we must use patented cleaning agents suitable for domestic oil products, such as PNF, and often clean the oil circuit, which will definitely delay the appearance of burning oil to a great extent, and even avoid cylinder pulling caused by high temperature.