How to solve abnormal sound of engine camshaft

The abnormal sound of the engine camshaft won't open. Camshaft bearing noise refers to the noise between camshaft bearing and shaft when the engine is working. This is a rhythmic and dull metal tapping. When the idle speed is slightly higher, the noise is more obvious at each camshaft bearing. The causes of abnormal sound of camshaft are: 1, and the wear of camshaft journal and bearing makes the fit loose; Camshaft bending deformation; 2. The sounding part on the camshaft side changes slowly. When the throttle is idling, the noise is clearer. At medium speed, the noise is obvious. When the speed is high, the noise becomes messy or weakened or even disappears, which may be the abnormal sound of the camshaft. 3. Remove the valve cover, press the camshaft with a metal rod, and listen to whether the noise has changed, that is, the camshaft ring; 4. Touch the metal bar or stethoscope near the cylinder bearing. If there is strong sound and vibration somewhere, it can be preliminarily concluded that the log is ringing.