What should I do if the valve sound of Haval h2 engine is loud?

Sometimes we will meet our own car engine valve with a particularly loud sound. What should we do? Methods/Steps Air leakage of the valve leads to air leakage outside the valve chamber. It is more obvious at high load and low speed, and the noise increases with the increase of load. The main reason is that when the valve seat is hinged, 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 and air leakage. Solution: Remove the cylinder head, grind the valve, check the valve spring force and readjust the valve clearance. When the engine is running at idle speed, the valve knocking sound occurs continuously between the end of the valve stem and its driving part, which increases with the increase of speed, and the sound remains unchanged when the engine temperature changes or shuts down. Main reasons: (1) The valve clearance after adjustment has changed (the locking is not firm, the valve stem and the driving part are worn), and the valve adjustment is not good. (2) The valve adjusting screw is worn, the locking nut is loose, and the valve clearance is too large or inconsistent. (3) valve spring retainer wears the groove, and the valve stem and guide tube are excessively worn. Treatment: Re-adjust the valve clearance. If the lock nut on the adjusting screw is loose, lock it and replace the seriously worn parts. If the basket is broken, replace the seat ring; If the seat ring falls off, it means that the surface of the valve seat ring is rough and the machining accuracy is unqualified; If the interference of the seat ring is not properly selected, it will loosen; Improper material selection and excessive deformation after heating; Or the assembly process of the valve seat is not satisfactory. Treatment: reassemble the valve seat according to the assembly process requirements, with the upper end face flush with the plane of the valve body and the higher part leveled.