Causes and Maintenance of Diesel Engine Cylinder Failure
With the development of agricultural mechanization and the improvement of people’s living standards, more and more farmers have purchased tractors. When using tractors, it will inevitably lead to some breakdowns, especially if the diesel engine malfunctions make the driver more troublesome. Pull the cylinder failure, introduce its causes and maintenance. The pull cylinder is a kind of adhesive wear between the piston and the cylinder liner. The wear surface temperature is too high, causing them to melt and bond with each other. With the reciprocating motion of the piston, the sticky part is pulled apart, resulting in the cylinder liner and Damage to the piston surface. First, the threat of pulling the cylinder 1. The diesel engine speed decreases, the power decreases, and when it is serious, it will stop by itself; it is difficult to shake the car after parking or shake the car. 2. The diesel engine emits a heavy abnormal sound. 3. The cooling water temperature, cylinder temperature, and oil temperature increase significantly. 4. Smoke in the crankcase can smell the smell of oil. Second, the reasons for the occurrence of cylinder 1. The cylinder sleeve lubrication is poor. Cylinder sleeve lubricating oil is insufficient, the oil viscosity is too large or too small, and the piston with the clearance is too small and other reasons, will make the surface of the cylinder sleeve due to local lubrication, friction and severe temperature and high. 2. The cylinder liner and piston are overheated. Because the diesel engine is overloaded for a long time, the amount of cooling water is insufficient or interrupted, the piston ring is seriously leaking, the injection timing is too late to cause post-combustion, and the cylinder sleeve and the piston are overheated, resulting in a cylinder accident. 3. Misalignment of the piston rod set or bending deformation of the connecting rod. Due to improper installation, the centerline of the piston connecting rod group offsets too much from the centerline of the cylinder liner, or the connecting rod deforms along the direction of the piston pin, causing the piston to be biased to one side or skewed, causing serious local surface friction and excessive temperature. 4. Bad running-in. After a newly installed or repaired diesel engine, empty running must be carried out in order to eliminate machining tool marks on the surface of the parts and then to increase the load operation. If the running-in is unsatisfactory, the machining tool marks on the surface of the part are not eliminated, and the load operation is increased, which may cause the local surface to generate heat due to increased friction, resulting in the occurrence of a pull cylinder accident. Third, pull cylinder failure maintenance diesel engine cylinder pull failure, first of all reduce the load, reduce the throttle, if necessary, remove the load of the diesel engine, and then stop. After parking, drain the cooling water, open the valve with a pressure relief device, shake the handle to rotate the flywheel, and discharge the gas in the cylinder. At this time, do not fill the cooling water tank with cold water to prevent the piston from being stuck in the cylinder. . Finally, the piston connecting rod group was lifted to check the wear of the surface of the piston and cylinder liner, which can be polished with the fine sand layout part. Find and eliminate the cause of cylinder pull before driving.
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