What are the fault problems corresponding to abnormal sound response in the piston ring of the generator set?

Friends who often operate generator sets know that the piston ring is one of the vulnerable components of the generator set, and the sound is a sign of a problem. So let’s follow Haixing Power to learn and learn about what problems correspond to abnormal sound responses in the piston ring of the generator set.

Haixing Power selected three representative sound failures:

(1) The metal hitting sound of the piston ring. After the engine is working for a long time, the cylinder wall is worn, but the upper part of the cylinder wall cannot contact the piston ring almost maintains the original geometry and dimensions, which creates a step for the cylinder wall. If the old cylinder gasket is used or the new cylinder gasket is thin, the piston ring at work will collide with the cylinder wall steps, making a dull 'puff' metal impact sound. If the engine speed increases, the abnormal noise will also increase. In addition, if the piston ring is broken or the gap between the piston ring and the ring groove is too large, it will also cause a larger knocking sound.

(2) The sound of air leakage in the piston ring. The elastic force of the piston ring is weakened, the opening gap is too large or the opening overlaps, and the cylinder wall is pulled with grooves, etc., which will cause the piston ring to leak. Its sound is a 'drink' or 'hiss', and when there is a serious leak, it makes a 'puff' sound. The diagnosis method is to turn off the engine when the engine water temperature reaches above 80℃. At this time, a little fresh and clean engine oil can be injected into the cylinder. After turning the crankshaft for several turns, the engine will be restarted. If the abnormal noise disappears at this time, but it appears again soon, it can be concluded that the piston ring is leaking.

(3) An abnormal sound of excessive carbon accumulation. When there is too much carbon deposit, the abnormal noise from the cylinder is a sharp sound. Because the carbon deposit is burned red, the engine is a bit prematurely ignited, and it is not easy to turn off. The formation of carbon deposits in the piston ring is mainly due to the lack of tight sealing between the piston ring and the cylinder wall, the gap between the openings is too large, the piston ring is installed and the ring ports overlap, causing lubricating oil to flow upward, high-temperature and high-pressure gas to flow downward, and combustion at the piston ring, resulting in carbon deposits or even sticking to the piston ring, causing the piston ring to lose its elasticity and sealing effect. Generally, after replacing the piston ring with appropriate specifications, this fault can be eliminated.