What are the symptoms of valve leakage?

1 Answers
Devon
07/28/25 5:40pm
Automotive valve leakage manifests as weak vehicle performance, difficulty in starting/accelerating, decreased engine power leading to increased fuel consumption, and over time, noticeable carbon buildup in the engine system. The following are the manifestations of valve leakage: 1. Reduced sealing between the valve and valve seat due to valve erosion. 2. Poor grinding of the valve sealing ring during maintenance. 3. Valve clearance adjusted too small, resulting in incomplete valve closure. 4. Foreign objects causing poor sealing when the valve is installed into the valve seat. 5. Carbon buildup on the conical surface of the valve and valve seat. 6. Pitting, scratches, stains, burns, or dents on the valve working surface. 7. Excessive runout of the valve and valve stem. 8. Excessive coaxiality deviation between the valve guide hole and seat hole.
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