How to judge whether the valve oil seal is damaged ？

There are several ways to determine whether the valve seal is damaged, and a detailed analysis can be conducted in combination with specific performance:

1. Observe fuel consumption: 

If the engine oil consumption is abnormal, especially if it continues to increase, it may be that the valve seal fails and oil enters the combustion chamber. Check the oil level and oil volume changes regularly. If you find that you need to refuel frequently, you should pay attention.

2. Check exhaust smoke: 

When accelerating or idling, observe the color of the smoke in the exhaust. If blue smoke appears, especially when the vehicle is accelerating, this is usually a sign of valve seal damage, which means that the oil enters the combustion chamber and burns with the fuel.

3. Engine idle jitter: 

If the engine jitter increases at idle, or the operation is unstable, it may be due to valve seal leakage, resulting in abnormal oil volume in the cylinder, affecting combustion efficiency.

4. Check the spark plug: 

Remove the spark plug for inspection. If you find oil stains or obvious carbon deposits on the spark plug, this usually indicates that the oil has entered the combustion chamber and the valve seal may have failed. The color change of the spark plug can also reflect the combustion situation.

5. Perform a pressure test: 

Use a compression tester to detect cylinder pressure. If the pressure of a cylinder is significantly lower than that of other cylinders, it may be caused by a valve seal leak. In addition, a vacuum test can also help identify cylinder sealing problems.

6. Observe cold start performance: 

During a cold start, if the engine makes an abnormal sound or runs unsteadily after starting, and gradually returns to normal after driving, it may be that the valve seal has failed and oil has seeped into the cylinder.

Prevention and maintenance

• Regular maintenance: Regularly replace the engine oil and filter to keep the engine clean and reduce the risk of oil seal damage.

• Regular inspection: Check the status of the valve seal during routine maintenance to detect potential problems in time.

• Pay attention to driving habits: Avoid frequent sudden acceleration and high-speed driving to reduce wear on the valve seal.

Timely detection and replacement of valve seal damage can effectively prevent engine damage and extend the service life of the vehicle.