The phenomenon that the cylinder jacket is soon abraded or slot cut is called as early abrasion. The causes are usually as follows:
1. The places where the diesel is used are often very sandy. The climate conditions are very severe like the northwest of China. The air filter with superior filtration effect shall be used.
2. The surface of the piston is too rough or the flexibility of the piston ring set is too strong. Design or select piston with relatively high roughness and piston ring with modest flexibility.
3. The mark and specification of the engine oil used is in correct, or the oil is too watery or too dense, or the oil pressure is insufficient to cause the failure of the cylinder jacket obtaining good lubrication. Use the engine oil with the mark specified in the instruction manual provided by the manufacturer of the diesel.
4. During the engine oil filling, dust or impurities may be mixed into the oil sump of the combustion motor. Improve the method for Sinoteng construction machinery oil filling to avoid the mixing of the dust or impurities into the oil sump.
5. The function of the air filter on Sinoteng construction equipment is not good to cause much dust to be absorbed into the cylinder with air, reflecting a bad filtration effect, which will accelerate the abrasion of the cylinder jacket. Select filter with good filtration effect or strengthen the filtration effect. The secondary filtration can be adopted, i.e. connecting to oil batch filter or paper filter.
6. During the grinding of the cylinder jacket, the roughness fails to reach the standard. Improve the machining process and machine according to the standard process.
7. The axial clearance of the crank shaft is too big to cause the shift of the crank shaft in the front and the back. Check the axial clearance of the crank shaft. Replace the front and back thrust bearing when necessary.
8. The on-load operation is immediately carried out after cold start. The normal working temperature cannot be maintained within a long period. Change the operating method, and gradually improve the rotating speed and increase the load.
9. The engine oil filter is too dirty and maintenance and cleaning are not timely carried out. Replace the cleaner insert part according to the requirement of the instruction manual.
10. The rotating speed of the diesel is not stable. Check the speed controller of the oil pump to make the speed stable.
11. After the air filter is used to certain degree, it will send signals to request quick dust removal and maintenance, but the filter element is not timely replaced and so on. The air filter adopted by our company has two filter elements and three structures. Cylinder 4, 6, and 12 natural suction diesel adopts inertia oil-batch air filter with steel wool filter element; the boosting diesel adopts K2442XF-1 cyclone paper air filter. There is an intake resistance indicator set on K2442XF-1 air filter. When the window of the indicator turns from yellow to red and the arrow indicates 7.5kpa vacuum degree, it shows it is necessary to remove the dust and maintain this filter quickly. After maintenance, press the upper part of the indicator to reset the mark of the indicator.
As for the inertia oil-bath air filter with the steel wool filter element and without resistance indicator, it is usually cleaned every 100 hours it is operated. The interval shall be properly increased or decreased according to the concentration of the dust in the environment. During the cleaning, take out the steel wool and put it in the gasoline to clean. Also, use compress air to blow it clean. Meanwhile, clean the oil pool of the filter and then add proper amount of new engine oil. When the resistance indicator of K2442XF-1 cyclone paper air filter does not work, the air filter can still be taken out. However, the dust accumulated in the dust collection case shall be cleaned every 100 hours it is operated. Take it out every 100 to 250 hours. Gently strike the end face of the filter element or blow from the inner cavity of the filter element by using compressed air with the pressure not greater than 490kpa. Also, you can use brush to gently brush the stained surface.
However, it is strictly forbidden to use oil or water to cleaner. If it is found that the filter element is damaged or the dirt is too much to clean, replace it.