Diesel generator pull cylinder failure is a striped, colored damage that appears along the direction of piston movement on the surface of the cylinder and piston ring. When the diesel generator set fails to pull the cylinder, the wear of the cylinder liner is very severe, which can reach dozens or even hundreds of times of normal wear. Failure phenomenon of cylinder pull of diesel generator set

1. The external characteristics of the diesel generator set after the cylinder is pulled is that the sound changes, and the exhaust emits black smoke.

2. The working surfaces of the piston, piston ring and cylinder liner are damaged, the gas seal fails, the oil consumption and blow-by gas volume increase rapidly, making the engine unable to run normally, even in a short time, due to the piston, piston ring and cylinder liner Bite and stop. Causes of cylinder failure of diesel generator set

1. The main reason for pulling the cylinder is actually that the surface of the piston, piston ring and cylinder liner is “welded” and damaged due to high temperature. That is, the dry friction between the piston and the cylinder liner is not caused by the interruption of the oil film. The hot frictional heat causes the metal to melt and adhere, and tears the nearby metal points.

2. The most fundamental reason for the cylinder of diesel generator set is the oil film interruption. According to the requirements of gas sealing, the gap between the piston ring and the cylinder liner should be as small as possible, which makes their lubrication conditions very unfavorable. When the contact surface is overloaded, the cylinder liner surface and the piston ring working surface are severely rubbed due to direct contact, generating a large amount of frictional heat, which causes the temperature of the working surface to rise sharply. Causes strain.

It can be seen that poor oil supply conditions, severe blow-by gas, and excessive contact stress of parts destroy the oil film, which is the main reason for the cylinder. In addition to lubrication, fit clearance, and part manufacturing quality, improper use may also cause failure of the cylinder of the diesel generator set. Specifically, there are the following points:

1. The fit clearance between the piston and the cylinder liner is too small, or it has not undergone a good running-in before it is officially loaded.

2. Poor lubrication, such as small clearance, thin oil or no oil during assembly.

3. Diesel engine is overheating.

4. The body is not clean or the piston is too dead during assembly.

5. Poor piston and piston ring quality.