Is it really necessary for the mechanic to ask for cleaning the engine?
Is it really necessary for the mechanic to ask for cleaning the engine? The valve of turbocharged direct injection engine has more carbon deposits, which is a common problem of all types of turbocharged direct injection engines. There is no solution, so it can only be cleaned during maintenance. If the cleaning is not thorough, it will directly damage the valve.
With the increase of fuel consumption, more and more carbon is deposited, which leads to engine oil burning on the side and the possibility of cylinder wear. Cleaning the engine compartment requires patience. Rinse and wipe with low-pressure water. Oil stains can be dissolved with detergent or foam cleaner. As for professionalism, that's out of the question. As long as you can clean the table, you can clean the engine compartment.
It's just that this cleaning part doesn't need to be done often, because when you maintain the car, the maintenance staff will use high-pressure air to purge the dust. In addition to adding glass water and antifreeze, daily vehicles do not often check the engine, even if there is some dust. Engine oil itself consists of "additive+lubricating oil", and lubricating oil is called base oil.
It is these additives that add extrusion abrasion resistance, corrosion resistance, defoaming, emulsion oxidation resistance and cleaning functions to the foundation. Embarrassed, these additives have the same function as the so-called engine protective agent sold in the market ... It seems that there are only 5-7 known oil additive suppliers in the world.
Most engine brands that bought oil additives have never been heard of since. Is it really safe to clean the engine with these additives? If you really want to clean it again, just change the oil twice each time. The "engine cleaning" recommended by 4S shops and repair shops is generally cleaning without disassembly, that is, cleaning the engine surface and cleaning up carbon deposits.
Cleaning of gasoline catalyst residue. Of course, there are more comprehensive engine deep cleaning, that is, cleaning after disassembly, such as nozzle cleaning, throttle cleaning, exhaust system cleaning and so on. Specific projects, each repair shop or 4S regulations are different. Cleaning the engine is by physical or chemical means.
Cleaning up the carbon deposit in the pipeline and the debris, deposits and impurities caused by mechanical friction during engine operation, the ultimate goal is to improve the working efficiency of the engine, improve the engine power, reduce fuel consumption and prolong the engine life. The most common method is to disassemble and clean the intake air, and the carbon deposit in the intake system will affect the consumption of the engine.
Therefore, it is necessary to clean up the carbon deposit at the air inlet. Another method is to remove carbon deposits with hanging bottles. Now there is dry ice cleaning. Dry ice is ground into powder and blown to the place where it needs to be cleaned, and the heat absorption, carbon deposition and shrinkage carbon deposition of dry ice are blown away. However, these methods can only clean up the carbon deposits at the air intake, throttle and piston top.
The carbon deposited in the combustion chamber of engine cylinder is heavy, and it has accumulated hard for many years. Clean it thoroughly. Compared with the previous engine combustion, it produces fewer particles, which will not affect the performance of the engine for a period of time and does not need cleaning at all. But for diesel engines, the particulate emissions it produces are more serious than those of gasoline engines.
After adding new engine oil and running for half an hour or an hour, the engine oil will turn black and the particle content will be much higher. Compared with gasoline engines, it has the functions of lubrication and cleaning, and there is no need to clean the engine, so long as it is maintained in time, there is no problem. If the diesel engine has not been maintained for a long time, such as a year or so, I suggest you do an engine cleaning.
Because the oil is not changed for a long time, there will be emulsified and diluted oil, which will affect the effect of oil. But when you open the cover of the machine, you will see how thick the dust is, indicating that the owner is careless; And most importantly, more and more dust will definitely have a bad influence on the engine and affect the wiring in the engine compartment.
Especially for air filters, a clean engine room will suck more dust, leading to faster congestion. When the car is for sale, open the lid to make it clean and pleasing to the eye. You will know that the owner of the car is also a car lover, and the car is definitely good and will definitely make more money.
The cleaning of the computer room, every time the 4S shop does maintenance, the master in charge will blow it with a high-pressure air gun. This is the best cleaning method, but we personally don't have this condition, so I basically wipe the car with a cloth every time, and then rinse it with water.