A netizen told me today that after his car was maintained in the 4s shop, the repairman did not put the cover of the air filter in place. He only found out after he ran for more than a thousand kilometers. Is this harmful to the engine?
Regarding this issue, I first told him two small cases, and then analyzed the harm of doing so in detail.
A Dfsk k01, only a few months after the new car was put into use, suffered from engine oil burning, lower exhaust, and insufficient power. We found the 4s shop based on a quality problem. After they sent someone to check, the problem was immediately discovered-the air filter cover of the car did not know when it fell off, and our work site was very dusty, and a large amount of unfiltered air entered directly The engine is out, causing the engine to pull the cylinder.
After disassembling the engine, it was found that the cylinders of the compact SUV engine were severely worn, with fine and small scratches on them, the piston rings were blocked by carbon deposits, the valves were all carbon deposits, the valve ports were ablated, and the oil became black, smelly and sticky , There is a thick layer of sludge on the oil pan. Such an engine can only be overhauled, and the culprit for this consequence is that the air filter is not installed properly.
There is also a small Jiefang light truck, which is used as our on-site emergency repair vehicle.
After a few years of use, the engine was exhausted and the oil was burned, and the engine was overhauled. But a few months after the repair was completed, such a malfunction occurred again, so the engine was repaired again. But this engine just didn't work, and it was repaired three times in one year.
After a thorough inspection of the cause of the failure, it was discovered that the air intake pipe from the air filter to the engine was ruptured. The location was very hidden. A large amount of unfiltered air entered the engine from here, causing abnormal engine wear.
In addition, we have also set a national record-Sinotruk’s MC11 engine, the first overhaul took place here.
The cause of the engine overhaul was also related to the air intake: a section of the air intake bellows was broken. In fact, the rupture of this bellows has little to do with our users. It is more due to design or material reasons. We also filed a claim with the manufacturer.
Later, this part should be improved, and the new bellows will not have this kind of malfunction.
Are you scared to see this? My goodness, the consequences of not installing the air filter are so serious. Will my engine also be scrapped?
is actually not that scary. If the air filter is not installed properly, it will definitely have an impact on the engine. The magnitude of the impact depends on your driving environment and air quality.
If your driving environment is very harsh and the dust in the air is very large, it is easy to cause abnormal wear and tear of the engine. For example, in a car driving in a mining area, the air filter will stick to a layer of dust within a week;
If your driving environment is better and the air is cleaner, the impact will be small and almost negligible. For example, a car driving in a city with beautiful scenery and good air quality. In some cities, the car air filter is basically not used for a year. What dust.
We analyzed the most serious impact, and talked about if the car air filter is not installed properly or if the quality is not good, it will affect the car and damage the engine.
As you all know, a car engine needs two substances when it works: air and fuel. These two substances are provided by the air supply system and the fuel supply system respectively. They are mixed in the engine intake pipe or combustion chamber in a certain proportion, and then burned to do work.
The structure of the engine is very precise, and the clearance of many friction pairs is very small, even only a few tenths of a millimeter. Therefore, the engine has very high requirements for the cleanliness of the substances entering the body. The fuel supply system has a fuel filter, and the air supply system has an air filter.
The air surrounding us, no matter how clean it looks, contains some hard particles such as dust and sand that are invisible to our naked eyes.
The role of the car air filter is to filter out the dust, sand and other impurities suspended in the air, prevent them from entering the engine, and provide the engine with clean and sufficient air.
General air filters have a filtration accuracy of about 0.03mm, and some high-precision air filters can be as high as 0.005mm, so that most of the hard particles such as dust in the air can be filtered out.
If the air filter of the car is not installed properly, a large amount of unfiltered air enters the engine directly;
Or the quality of the air filter is not good, the filtration accuracy is not high, and the air entering the engine still contains many impurities. What impact will it have on the engine?
When air enters the engine, the valve is the first to bear the brunt.
Everyone knows that the important role of the valve is to seal, and its sealing is achieved by the close fit between the valve and the valve seat ring.
If the air contains a lot of hard particles, they will flow through the valve and valve seat at high speed, which will scratch the sealing surface, leave scratches on it, and reduce the sealing performance of the valve;
If large hard particles happen to be caught between the valve and the valve seat ring, the valve will not close tightly. After some engines are decomposed, there are a lot of pitting on the valve, which is generally caused by impurities in the air.
If the valve sealing is not good, the compression performance of the engine will decrease, which will cause the engine power to decrease, and in severe cases, it will cause difficulty in starting the engine.
Air enters the combustion chamber of the engine from the intake valve and is compressed by the piston. In this process, the hard particles in the air will enter between the piston and the cylinder wall, and aggravate the wear of the piston and the cylinder wall. This kind of wear is called "abrasive wear", which is a kind of abnormal engine wear. It is characterized by The cylinder is ground into a waist drum shape with a large middle and small ends. If the diameter of the hard particles is larger than the gap between the piston and the cylinder wall, it may even cause the engine to pull the cylinder.
In addition, these particles will also enter the piston ring groove, aggravate the wear between the piston ring and the piston, cause the end clearance, backlash and backlash of the piston ring to increase, and reduce the sealing performance of the piston ring.
Carbon deposits are formed in the piston ring groove with the engine oil, which causes the piston ring to stick, jam, etc., lose the function of oil distribution and oil scraping, and increase engine oil consumption.
If these particles enter the oil pan through the gap between the piston and the cylinder wall, it will also contaminate the oil, cause the oil to deteriorate and reduce the lubrication performance. Some engines with poor filtration have a thick layer of sludge in the oil pan, the main source of which is hard particles in the air.
Particulate matter in the air is also a "premium" source of engine carbon deposits.
Whether in the intake duct or in the combustion chamber or on the valve, the oil vapor, the gum in the fuel, the products after combustion, etc. are looking for places to attach to form carbon deposits, and the particulate matter in the air can be used as carbon deposits. The crystal nucleus, so that carbon deposits form faster. Decomposing the engine, you will find that all engines with poor air filtration have very serious carbon deposits.
If it is a turbocharged engine, the hard particles in the air can also damage the impeller of the turbocharger.
The surface of the impeller of a normal turbocharger is smooth and the edges are rounded. When the air flows through, the resistance is small and there is no resonance.
If the air contains a large amount of hard particles, they will scratch and hit the impeller when they flow through the impeller of the turbocharger at high speed, causing the impeller surface to be uneven, the edges become not rounded, and even a part of the impeller is lost due to wear. This will result in a decrease in the supercharging performance of the supercharger, insufficient air intake, failure of the dynamic balance of the supercharger impeller, shortening the service life of the supercharger, and reducing the performance of the engine.
Therefore, if the air filter of the engine is not installed properly or the quality of the air filter is not good, the impact on the engine is still relatively large.
Especially for vehicles driving in areas with poor air quality and heavy dust, the air filter entering the engine has not been properly filtered, and a large amount of dust and sand enter the engine, which will soon cause exhaust under the dfsk engine, burning of oil, and loss of power. Wait for the breakdown, this kind of situation can only overhaul the engine to solve, the consequence is still relatively serious.
There are many types of air filters for automobiles, such as filter type, inertial type and oil bath type.
Our ordinary family cars generally use the filter type. Its structure is relatively simple, easy to maintain, and the air intake resistance is relatively small, but the filtering effect is also very general. Normal maintenance is generally cleaned once for 5,000 kilometers and replaced once for 10,000 kilometers. If driving in a dusty area, the maintenance period should be appropriately shortened.
It should be noted that this type of filter air filter should not be blown with compressed air frequently, otherwise it will cause its filtration accuracy to drop. Generally, it must be replaced after three blows at most.
For commercial vehicles such as trucks and construction machinery, they are used in a poor environment and the air is dusty. Generally, inertial and oil-bath air filters are used.
This kind of air filter is multi-stage filtration, and the filtration effect is better, but the structure is complicated, the maintenance is inconvenient, and the price is relatively expensive.
The theoretical replacement cycle of the car air filter element is 5000 kilometers to clean, and it is recommended to replace it for 10000 kilometers. The title says that it should be cleaned after 5000 kilometers and continue to use. This is normal and standard maintenance. If the car owner requests to replace the air filter element, there is no problem. The price of the toy is not expensive, and it can be replaced if possible. If you don’t want to replace it, just continue to use it, it’s okay.
I remember that my air filter was replaced when the Sibao was 30,000 kilometers away. Of course, the maintenance master removed the air filter and let me see the dust and debris on it. He only suggested that I replace it. If not, use the air tube. Blow, but there is a certain probability that it will affect the quality of the engine oil. It is a big problem that affects the quality of the engine oil. In the end, I thought about it again and again. The cost is tens of dollars and the price is not expensive. Change it if you want.
As for why I replaced the air filter element in accordance with the 10000 kilometers stipulated in the maintenance manual?
This mainly has to consider your own driving environment. If you often run in areas full of wind and sand, the load on the air filter element is particularly heavy, and the requirements on the air filter element are very high, and may have to be replaced when it is less than 5,000 kilometers.
The air filter element is not clean, and the surface has a covering that affects the intake air volume. There are small debris in the inhaled air, and the inhalation of the combustion chamber will increase the carbon deposit in the engine cylinder and the engine, and it will also cause the oil quality to change, which is very harmful.
I usually drive in a good environment, simply commute to get off work, occasionally run long distances, the air quality is good, the air intake has little effect on the air filter, and there is not much covering on the air filter surface. In this case, only the air pipe is needed. You can continue to use it with a single blow, but if there are too many coverings on the surface of the air filter element and the filter element is deformed, it must be replaced in time.
The routine maintenance of the car is not to replace the engine oil, replace the filter, replace the air filter element, replace the air conditioning filter element, check the antifreeze, brake fluid, transmission fluid, and so on.
The specific maintenance items are different according to the driving time and distance of the car. My maintenance cycle is between 8,000 kilometers and 10,000 kilometers. I don’t look at the time, and the mileage of the car determines the maintenance time. Of course, this must be replaced by the last maintenance. It is a fully synthetic engine oil and a good quality engine oil filter element.