How To Solve The Problem Of Engine Valve Noise

Solution to engine valve noise: 1. The valve leaks. The valve leaks 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, the valve seat is skewed or the valve clearance is small due to improper operation or excessive wear of the inner hole of the valve guide, 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. 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 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: according to the assembly process requirements, the upper end face of the valve seat shall be re inserted and flush with the body plane, and the higher part shall be leveled