How to Deal with Valve Abnormal Noise?
3 Answers
Valve abnormal noise can be addressed by readjusting the valve clearance. If the lock nut on the adjustment screw is loose, it should be securely tightened, and severely worn components should be replaced. The function of the valve is to input air into the engine and expel exhaust gases after combustion. Structurally, valves can be divided into intake valves and exhaust valves. The intake valve draws air into the engine to mix with fuel for combustion, while the exhaust valve expels the burned gases and dissipates heat. The valve consists of a valve head and stem. The valve head operates at high temperatures and is subjected to gas pressure, the force of the valve spring, and the inertial force of the transmission components. Due to poor lubrication and cooling conditions, the valve must possess sufficient strength, stiffness, heat resistance, and wear resistance.
As an experienced driver, I've encountered quite a few valve noise issues. Usually, the noise comes from excessive valve clearance or insufficient lubrication. I would first start the engine to listen for the location, then open the hood to inspect the valve assembly clearance. If the clearance isn't right, adjusting the shims or replacing the valve stem is necessary; when oil pressure is low, adding some high-quality lubricant can solve the problem. Sometimes, the noise is caused by wear on the valve stem or aging springs, which requires disassembly for repair or replacement of parts. I recommend regular engine maintenance to avoid dust clogging; don't delay when encountering noises, address them early to prevent more severe engine damage, such as valve deformation or increased fuel consumption. Last year, my car required a major repair due to ignoring the noises, costing me unnecessary money—a profound lesson. For safety, checking the car when parked at night is somewhat safer.
With decades of experience in auto repair, the first step in addressing valve noise is diagnosis. Listen for the sound source while the engine is running, and check the gap manually or with a feeler gauge. In most cases, the gap is too large, requiring adjustment with a specialized wrench or replacement of the shim. For lubrication system issues, check the oil pressure gauge and replace the oil or clean the oil passages if necessary. If the valve stem is worn, disassembly, cleaning, or installation of new parts is required. Valve noise is more common when the engine temperature is high, so pay extra attention to cooling during summer driving. Prevention is key—regular oil changes and valve system maintenance can extend engine life. Last year, while helping a friend fix a noise issue, we discovered a faulty oil pump, and addressing it together saved costs. Avoid disassembling parts randomly; professional shops offer precise, efficient, and safe diagnostics.
