How to Repair Valve Leakage?

[LaAlexa]

To identify the fault, it is necessary to repair, adjust, or replace the related worn or damaged components. The causes of valve leakage are as follows: 1. Poor contact between the valve head contact band or valve seat: There are spots and carbon deposits on the contact band, or the contact angle with the valve does not meet the requirements, resulting in poor sealing between the valve and valve seat and causing leakage. 2. Excessive carbon buildup on the valve stem: The reciprocating motion of the valve is not smooth, affecting the timely reset and sealing of the valve, leading to leakage. 3. The valve clearance is too small or other mechanical failures occur: This causes deformation of the valve stem, misalignment between the valve stem and its contact band, resulting in leakage. 4. Fuel injection pump failure: This leads to poor atomization of the injector and delayed fuel injection, causing damage to the contact band between the valve and valve seat, thereby affecting the valve's sealing performance.

[JudahMarie]

As a seasoned car enthusiast who often tinkers with vehicles, when encountering valve leakage issues, I first perform simple checks to confirm if it's a real fault, such as unstable idling or insufficient power during startup. Next, I inspect the leakage location by using a compression tester to measure the pressure in each cylinder; if the readings are low, it might indicate poor valve sealing. Then, I remove the cylinder head to clean the valve seat and valve surface. If the wear is minor, I purchase some lapping compound and manually grind it a few times to restore sealing; if the wear is severe, I have to replace the valve with a new one, ensuring to use the right tools to avoid damaging other components. Once, I spent half a day grinding the valves on my old car, and after testing, it ran smoothly and became more fuel-efficient. Remember to wear gloves for safety during the operation, and finally, reassemble everything and take a test drive to confirm. DIY can be fun, but don't push yourself too hard.

[DiLola]

As a long-time regular user of family cars, it's best not to tamper with valve leakage yourself—the engine internals are too delicate and prone to errors. Drive to a professional shop immediately for diagnosis; they have the equipment to pinpoint which valve is faulty, possibly due to dirty sealing surfaces or deformation. Technicians will clean or grind to repair; if the damage is severe, they'll replace parts to ensure durability. DIY repairs carry high risks, such as improper installation leading to engine failure or safety hazards. Last time I had leakage, it caused a sharp 10% increase in fuel consumption, but after professional repair, performance recovered significantly. Safety always comes first—leave it to the experts for peace of mind, effort savings, and long-term vehicle stability.

[Juan]

From my car repair experience, the core of dealing with valve leakage lies in diagnosing and fixing sealing issues. First, remove the cylinder head to check for wear on the valve seat and valve stem; if it's minor, use grinding tools to restore surface smoothness; if severe, replace with new parts. During the process, adjust the valve clearance properly to avoid subsequent abnormal noises. Pay attention to cleaning all components during assembly, and after reassembly, test the compression to ensure no leaks. This requires high technical skills—non-professionals should not attempt it; finding a reliable repair shop is more convenient, reliable, and durable.