What are the symptoms of increased valve clearance?
1 Answers
Symptoms of increased valve clearance: 1. Excessive valve clearance causes impact noise between transmission components and between the valve and valve seat, accelerating wear; 2. Reduces the duration of valve opening, worsening cylinder charging and exhaust conditions; 3. Power decreases, and in severe cases, the engine may even be difficult to start. To eliminate this phenomenon, a certain clearance is usually left between the valve and its transmission mechanism during cold assembly of the engine to compensate for the thermal expansion of the valve; 4. When the engine is running, the valve will expand due to temperature rise. If there is no clearance or insufficient clearance between the valve and its transmission components in the cold state, the thermal expansion of the valve and its transmission components in the hot state will inevitably cause the valve to fail to close tightly, resulting in air leakage during the compression and power strokes of the engine.