Is Valve Noise Related to Engine Oil?
1 Answers
Valve noise is related to engine oil. The following are the related reasons: 1. Insufficient engine oil: When the engine oil level is insufficient and drops to a certain extent, air enters the hydraulic tappet along with the oil passage, creating a gap and causing valve noise. 2. Sludge in the oil passage: During engine operation, engine oil circulates in the hydraulic tappet. When sludge forms in the engine, it can block the oil passage, causing the hydraulic tappet's automatic gap adjustment function to fail, resulting in valve noise. 3. Incorrect oil viscosity selection: When the engine is severely worn, using oil with too low viscosity (e.g., 20 or 30 viscosity oil) can also cause valve noise. In such cases, switching to higher viscosity oil (e.g., 40 or 50 viscosity oil) can eliminate the valve noise.