Views: 0 Author: Site Editor Publish Time: 2021-07-31 Origin: Site
We hope to use any equipment as long as possible, even for diesel engines. However, the diesel engines currently in use are still far away from the normal conditions with an international average life of more than 8000h. One of the main faults in the early wear of diesel engine cylinder liners.
Diesel engine service life
How to keep diesel engines last longer?
Reasons for the durability of diesel engines
The valve life of a normal diesel engine is 20,000 hours, and the valve life of the main engine is about 50,000 hours. As long as the angle and the thickness of the degree layer are qualified, the grinding can be continued, and the current technology can still be processed.
Diesel engines have a simple structure and low internal running resistance. Diesel engines have unique advantages, and their service life is more than twice that of the same gasoline engines.
Correctly maintain and maintain the air filtration system
Failure of the air filtration system will cause the wear of the cylinder liner, which will greatly reduce the life of the cylinder liner. Therefore, there are higher requirements for air filtration, and multi-stage efficient air filters should be selected.
Always check and clean up the dust on each part to ensure that it is clean inside and outside. Damaged parts must be replaced in time to prevent abrasive particles from entering the cylinder liner. Ensure the tightness of the connection between the filter and the suction hose, and ensure that there is no air leakage between the turbocharger compressor outlet and the cylinder head.
Machine temperature control
The corrosion and wear of the cylinder liner largely depend on the operating temperature of the diesel engine. The test shows that when the coolant temperature drops to 40-50℃, the wear of the cylinder liner will be 5-6 times the normal wear, and it is mainly corrosive wear, so keeping the cooling system working temperature not exceeding 90℃ will greatly limit Sulfur-containing vapor condenses on the cylinder liner wall to reduce corrosion.
Selection of lubricating oil quality and viscosity
Diesel engines should select oils above CC and CD according to the operating instructions, that is, according to the enhanced strength of the diesel engine and the working environment temperature.
Cavitation on the outer surface of the cylinder liner and antifreeze coolant
The gas in the cylinder is combusted, and the piston will swing from side to side in addition to the reciprocating linear movement in the cylinder, causing serious vibration of the cylinder liner. At this time, the cooling water in contact with the cylinder liner generates bubbles under vibration. Many pits were formed on the outer circle of the cylinder liner for a long time, which gradually expanded to form cavities, resulting in penetrating the cylinder wall.
To prevent cavitation of the cylinder liner, in addition to taking measures in design and manufacturing, the following work must be done from the perspective of use, maintenance, and repair:
1) Reduce the impact of the piston on the cylinder liner. Under the condition of ensuring basic lubrication, the gap between the piston and the cylinder liner should be as small as possible, and at the same time, ensure the verticality of the cylinder liner center during assembly.
2) Pay attention to the selection and replacement of antifreeze coolant, choose products with good anti-corrosion and anti-corrosion performance, and check frequently during use, and the replacement time should not exceed two years.
Correct installation and use method
The use of diesel engines should be carried out in strict accordance with the provisions of the diesel engine manual. First of all, ensure the cleanliness of the cylinder liner and the body and other components， and the assembly gap of each component. The weight of the pistons and connecting rods of the same diesel engine should be as consistent as possible, not exceeding the tolerance, and the tightening torque of various bolts and nuts should be ensured value.
During the use of the crankshaft combination group, pay attention to whether the torsional vibration damper fails and whether the matching clearance of each bearing is out of tolerance to avoid abnormal vibration of the crankshaft and accelerate the early wear of the piston connecting rod group and the cylinder liner.
Reasonable choice of running-in specifications
Before the new engine or the overhauled diesel engine is officially used, it must be run according to the instructions of the user manual. Generally, it can be put into full-load use after 60 hours of running-in. The purpose of running-in is to improve the working conditions of the moving parts of the diesel engine and improve the reliability and service life.
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