Is the engine valve sound related to engine oil?

2. Oil quantity:

3. When the oil reaches the oil level, air enters the hydraulic tappet with the oil passage, making the valve ring.

4. When changing oil, air enters the oil circuit:

5. When discharging oil, the oil in the oil gallery will be discharged and air will enter the oil gallery. When the engine is started, air may enter the hydraulic tappet, causing the valve to ring. In this case, after the engine runs normally for a period of time, the air will be exhausted and the valve ringing phenomenon can be automatically eliminated.

6. There are sludge and carbon deposits in the oil;

7. When the engine is working, the oil will circulate in the hydraulic tappet, and the oil circuit will be blocked when the engine produces sludge, resulting in the failure of the automatic clearance adjustment function of the hydraulic tappet and the valve ringing.

8. Wrong choice of oil viscosity:

9. When the engine is worn, if low viscosity oil (such as high viscosity oil) is added, the valve will ring. In this case, the valve ring can be removed by replacing the oil with high-viscosity oil (for example, high-viscosity oil).