What faults do abnormal noises from the piston ring part of the generator set correspond to?

Frequent operationGenerator setAll our friends know that the piston ring is one of the vulnerable parts of the generator set, and the sound is an obvious sign of failure, so let us follow Haixing Power to learn and understand: What faults correspond to the abnormal sound of the piston ring part of the generator set.

Haixing Power selected three representative sound faults:

(1) Metal knocking sound of piston rings. After the engine has been operating for a long time, the cylinder wall is worn, but the upper part of the cylinder wall that is not in contact with the piston ring almost maintains the original geometric shape and size, which creates a step on the cylinder wall. If an old cylinder gasket is used or a new one is too thin, the working piston ring will collide with the cylinder wall step, 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 loud knocking sound.

(2) The sound of air leakage from the piston ring. The elasticity of the piston ring is weakened, the opening gap is too large or the openings overlap, and the cylinder wall has grooves, etc., which will cause the piston ring to leak. The sound is a 'drinking' or 'hissing' sound, and when there is a serious air leak, it will make a 'puffing' sound. The diagnostic method is to stall the engine when the water temperature reaches above 80°C. At this time, you can inject a little fresh and clean engine oil into the cylinder. After cranking the crankshaft for a few turns, restart the engine. At this time, if the abnormal noise disappears, it will start again soon. If it appears, it can be concluded that the piston ring is leaking.

(3) Abnormal sounds due to excessive carbon deposits. When there is too much carbon deposit, the abnormal noise coming from the cylinder is a sharp sound. Because the carbon deposit is burned red, the engine has symptoms of premature ignition and is difficult to stall. The formation of carbon deposits on the piston ring is mainly due to the lax sealing between the piston ring and the cylinder wall, excessive opening clearance, reverse installation of the piston ring, overlapping of the ring ports, etc., which causes lubricating oil to escape upward and high-temperature and high-pressure gas to escape downward, causing the piston to accumulate carbon deposits. The ring part burns, causing carbon deposits to form and even sticking to the piston ring, causing the piston ring to lose its elasticity and sealing effect. Generally, this fault can be eliminated after replacing the piston ring with a suitable specification.