At present, the average life of foreign diesel engine under normal conditions is above 8000h, and from the domestic use situation, there is still a certain gap to achieve the above indicators. One of the main faults is the early wear of the cylinder liner. Therefore, to solve this problem, the service life of the diesel engine can be greatly improved.

1, the correct maintenance and maintenance of air filtration system

The formation of cylinder liner wear air filtration system, the cylinder life is greatly reduced, so it has high requirements for air filter, air filter, the multistage selection.

To check and clean the components of the dust regularly, to ensure the clean inside and outside, for the damaged parts should be replaced in time, to avoid wear debris into the cylinder. Ensure the tightness of the filter and suction hose connection, and ensure that the turbocharger compressor outlet does not leak to the cylinder head.

2 、 control of machine temperature

The corrosion wear of cylinder liner depends on the working temperature of diesel engine to a great extent. Experiments show that when the temperature drops down to 40-50 DEG C, the wear of cylinder will be 5-6 times the normal amount of wear and corrosion wear, mainly, so keep working temperature of the cooling system does not exceed 90 degrees, will greatly limit the sulfur vapor condensation in the cylinder wall, so as to achieve the purpose of reducing corrosion.

3. Selection of diesel engine lubricating oil quality and viscosity

The diesel engine should select CC and CD oil according to the instruction manual, that is, according to the intensity of diesel engine and the working environment temperature.

4. Pitting and anti freezing coolant on cylinder outer circle surface

The combustion of the gas in the cylinder will cause the cylinder to vibrate severely, except for the reciprocating motion of the piston in the cylinder. At this time, the cooling water contacting with the cylinder liner generates bubbles under vibration. The long cylinder outer circle generates a lot of pitting, gradually expanded to form a cavity, leading to penetrate the wall. In order to prevent the hole corrosion of the cylinder sleeve of heavy truck fittings in Baotou north, in addition to the measures taken in the design and manufacture, the following work should be done from the point of view of maintenance and repair:

1) reduce the piston impact on the cylinder liner, in ensuring the basic lubrication conditions, the gap between the piston and cylinder should be as small as possible, while the assembly should ensure the verticality of the cylinder center.

2) pay attention to the selection and replacement of antifreeze cooling liquid, and select the qualified and qualified products with good anti-corrosion and anti-corrosion performance. The inspection should be carried out regularly, and the replacement time should not exceed two years.

5. Correct installation and use of cylinder sleeve, piston connecting rod group and crankshaft combination group

The diesel engine shall be strictly carried out according to the instructions for use of diesel engines. Ensure the cleanliness of the cylinder body and assembly clearance etc. parts and components of the first, one diesel engine piston, connecting rod of the weight should be consistent as far as possible, do not exceed the allowable error, at the same time to ensure that all kinds of bolt and nut tightening torque values.

Baotou beiben heavy truck parts crankshaft combined in use process, should pay attention to whether the failure of the torsional vibration damper, the bearing clearance is poor, to avoid the abnormal vibration of the crankshaft, accelerate the early wear of Baotou beiben heavy truck parts piston rod and cylinder group.

6. Reasonable selection of running in specifications

The diesel engine or overhauled diesel engine should be run in accordance with the instruction manual before the official use. After running in 60H, the diesel engine can be put into full load. The purpose of running in is to improve the working condition of each moving part of diesel engine, and to improve the reliability and service life. In the running in period, the load is 50%-80%, the speed is not greater than 80% of the calibration speed is appropriate, also should pay attention to don't run for a long time in idle condition. Be sure to change the oil carefully after running in. High idle speed and overload operation should be avoided in normal use.