1. Smear of butter
The main effect of butter is lubrication and sealing. Therefore, some repair workers in the process of maintenance, will be coated on the cylinder pad butter, think this can increase the sealing performance of the diesel engine. But it's really wrong. Because if butter is applied to the cylinder gasket, some of the butter will flow into the cylinder when the cylinder bolts are tightened. The remaining outside butter will cause a certain gap between the cylinder pad, the cylinder head and the plane of the body after being affected by the high temperature. In this way, the original seal of the cylinder pad is reduced.
Two. Never change the oil
The role of oil in construction machinery is particularly great, and many repairmen attach great importance to it. They are added completely according to the standard requirements. But many repairmen forgot about the oil quality check and the replacement of the oil. For a long time, only adding but not changing the oil will cause many parts of the engine to work in a poor lubrication environment, resulting in much more wear and tear than normal. Moreover, in the process of diesel engine operation, a lot of dirt will also enter the oil. If the oil is not replaced regularly, it is easy to cause accidents such as burning and holding shaft.
Three, cylinder liner and piston 名媛直播 are not assembled or installed.
Many repairmen believe that new 名媛直播 should be standardized when repairing. Therefore, in the face of new cylinder liner and piston 名媛直播, often do not look at the specific size. This will cause many times when the cylinder and piston 名媛直播 are not matched. When the maximum size cylinder is fitted with the smallest size piston, the gap between the two is too large to compress.
Four. Heat piston with open fire
In the process of installing piston pin, the piston should be expanded by heat. Many maintenance personnel directly put them on the open flame for heating purposes. However, because the thickness of each part of the piston is uneven, heating on the open flame will cause uneven heat and finally cause deformation. Therefore, the correct way of heating is to put the piston into the hot oil for heating.
Five. Abrasive cloth grinding axle bush
Scraping is a relatively high technical content in the maintenance of engineering machinery. Many repairmen will wear it directly in the process of scraping because of their own technology. However, when the abrasive cloth is used for grinding, the sand grains on the sand cloth are very easy to be embedded into the alloy so as to accelerate the wear of the diesel engine journal.
Six. Tighten the bolt
In the process of construction machinery maintenance, it is not the tighter bolt safety. This is mainly because many parts are required for the torque of bolts. However, many repairmen do not think so. They will tighten them as tightly as possible, which will easily cause bolts to break or thread slips.
Seven. The tire pressure is too high
In the process of inflating the tire, many repairmen do not pay much attention to tire pressure. This will easily lead to the occurrence of tire blowout in summer.
Eight. Open water tank and cold water
When the engine is overloaded and the heat is not good, it will cause the water tank to boil. The first reaction of many repairmen is to add water. However, if this time adding cold water will cause the cylinder head and cylinder to blow up, so the engine should be stopped at this time, and water will be added after its natural cooling.
Nine. Inaccuracy in cylinder measurement
Measuring cylinder clearance should be measured in the direction of piston skirt perpendicular to piston pin hole. However, many repairmen do not pay attention to other directions when they are measuring. However, because the skirt section is elliptical, the cylinder clearance is not equal.
