Causes of Abnormal Valve Noise of Diesel Generator Set
2022-10-25
After the diesel generator set has been running for a period of time, the abnormal sound of the valve will sometimes occur. At this time, everyone need not panic, but should stop the machine immediately to check, find the source of the abnormal sound of the valve, and solve it in time to ensure the normal production of the enterprise. Next, Raines makes a simple analysis on the causes of abnormal valve noise of diesel generator set for reference.
1. The valve leaks
The valve leakage noise is outside the valve chamber, which is more obvious at high load and low speed. The noise increases with the increase of load.
The main reason is that when reaming the valve seat, due to improper operation or excessive wear of the inner hole of the valve guide, the valve seat is skewed or the valve clearance is small, resulting in valve ablation, which causes the valve to close loosely and leak.
Treatment method: remove the cylinder head, grind the valve, check the spring force of the valve, and readjust the valve clearance.
2. The valve knocks
When the engine runs at idle speed, there is a continuous knocking sound between the tail end of the valve stem and its driving parts, which increases with the speed. The sound does not change when the engine temperature changes or the engine is cut off.
main cause:
1) The adjusted valve clearance changes (the locking is not firm, the valve stem is worn with the driving element, and the valve is not adjusted properly.
2) The valve adjusting screw is worn, the lock nut is loose, and the valve clearance is too large or inconsistent.
3) The valve spring seat is worn and grooved, and the valve stem and guide are excessively worn.
Treatment method: readjust the valve clearance. If the locknut on the adjusting screw is loose, lock it firmly and replace the severely worn parts.
3. The valve spring is broken and should be replaced.
4. The valve seat sounds and the seat ring falls off
The surface of the valve seat ring is rough, the machining accuracy is unqualified, the interference of the seat ring is not properly selected, causing looseness, the material is not properly selected, and the deformation is too large after being heated, or the fitting process of the valve seat is unqualified.
Treatment method: Reassemble the valve seat according to the assembly process requirements. The upper end face shall be flush with the body plane, and the higher part shall be leveled.
Through simple analysis, it is not difficult to find that a large part of the causes of abnormal valve noise of diesel generator set are improper daily operation or inadequate maintenance. Raines reminded that relevant enterprises should pay attention to the safe operation and maintenance of diesel generator sets. If conditions permit, a special person can be established to take charge of the system to ensure the safe operation of diesel generator sets.
1. The valve leaks
The valve leakage noise is outside the valve chamber, which is more obvious at high load and low speed. The noise increases with the increase of load.
The main reason is that when reaming the valve seat, due to improper operation or excessive wear of the inner hole of the valve guide, the valve seat is skewed or the valve clearance is small, resulting in valve ablation, which causes the valve to close loosely and leak.
Treatment method: remove the cylinder head, grind the valve, check the spring force of the valve, and readjust the valve clearance.
2. The valve knocks
When the engine runs at idle speed, there is a continuous knocking sound between the tail end of the valve stem and its driving parts, which increases with the speed. The sound does not change when the engine temperature changes or the engine is cut off.
main cause:
1) The adjusted valve clearance changes (the locking is not firm, the valve stem is worn with the driving element, and the valve is not adjusted properly.
2) The valve adjusting screw is worn, the lock nut is loose, and the valve clearance is too large or inconsistent.
3) The valve spring seat is worn and grooved, and the valve stem and guide are excessively worn.
Treatment method: readjust the valve clearance. If the locknut on the adjusting screw is loose, lock it firmly and replace the severely worn parts.
3. The valve spring is broken and should be replaced.
4. The valve seat sounds and the seat ring falls off
The surface of the valve seat ring is rough, the machining accuracy is unqualified, the interference of the seat ring is not properly selected, causing looseness, the material is not properly selected, and the deformation is too large after being heated, or the fitting process of the valve seat is unqualified.
Treatment method: Reassemble the valve seat according to the assembly process requirements. The upper end face shall be flush with the body plane, and the higher part shall be leveled.
Through simple analysis, it is not difficult to find that a large part of the causes of abnormal valve noise of diesel generator set are improper daily operation or inadequate maintenance. Raines reminded that relevant enterprises should pay attention to the safe operation and maintenance of diesel generator sets. If conditions permit, a special person can be established to take charge of the system to ensure the safe operation of diesel generator sets.