What is the method for diagnosing valve noise faults?

[AndrewDella]

The method for diagnosing valve noise faults is: Remove the valve cover, let the engine idle, and insert a feeler gauge into the gap between the valve tip and the tappet, testing each one individually. If the noise weakens or disappears when the feeler gauge is inserted into a particular valve gap, it indicates an issue. If the noise reduces but does not disappear after inserting the feeler gauge, use a screwdriver to pry the valve stem. If the noise disappears, it is caused by excessive valve clearance due to wear in the valve stem guide. When the engine ages or when oil circuit faults cause abnormal lubrication system pressure, the engine oil pressure cannot meet the required standard during operation. This prevents the valve tappet from adjusting the valve clearance properly. As a result, even when the engine reaches normal operating temperature, the valves may still produce continuous abnormal noise, indicating a fault. The function of the valves is to input air into the engine and expel exhaust gases after combustion. Structurally, the engine has intake valves and exhaust valves.

[DelJuliet]

Diagnosing valve noise issues requires a step-by-step approach. First, identify the type and location of the noise to confirm it's a valve problem rather than other components. I encountered this with my own car—the engine made a ticking sound at idle. Using a stethoscope, I pinpointed the noise near the valve cover. Next, check the valve clearance by measuring it with a feeler gauge. If the clearance is too large or too small, it could indicate worn lifters or faulty hydraulic lifters, requiring adjustment. Also, don’t overlook the engine oil condition—low oil pressure or dirty oil can also cause noise, and changing the oil may solve it. If the issue persists, it’s best to visit a professional shop for internal inspection. Addressing it early prevents engine damage, saving money and ensuring safety. I delayed once and ended up spending hundreds more on repairs.

[DeHarley]

To address valve noise, I prefer starting with the basics: first, start the engine and listen carefully to locate the noise. Normally, a rhythmic tapping sound comes from the valve cover. Then, use a feeler gauge to measure the clearance. The standard value is usually around 0.2mm—if it's too large, it means the tappet needs adjustment. This job isn't difficult; feeler gauge kits are available at tool stores, so you can practice doing it yourself. If the clearance is normal, check the oil level and pressure, as low oil or aged oil can lead to insufficient lubrication. For issues with hydraulic lifters, part replacement might be necessary. In short, don’t delay—severe noise can affect engine lifespan. I learned this trick at the garage, and it’s helped many people. Regular maintenance can prevent trouble.

[VonIker]

My car had a valve noise issue, and diagnosis requires a step-by-step approach. Listen to the noise to confirm the location, which is usually noticeable at idle. Check the gap with a feeler gauge, and adjust it if it's too large. Pay attention to the oil condition, as low or dirty oil can accelerate wear. Fixing it yourself saves money, but if not possible, take it for repair. The key is not to ignore the noise, or the engine may be ruined. Safety first, early detection and resolution are crucial.

[McWilliam]

As an experienced driver, let me teach you how to diagnose valve noise: Start the engine and listen for abnormal sounds. If there's a tapping noise coming from the valve area, it's likely a clearance issue. Last time I used a feeler gauge and found excessive valve clearance, which caused lifter wear. After adjustment, the noise disappeared. Also check the oil dipstick - low oil level or contaminated oil requires replacement, otherwise insufficient lubrication will worsen the noise. For damaged hydraulic lifters, simply replace the component. This repair isn't expensive, but prolonged neglect may lead to engine overhaul and higher costs. Always pay attention to abnormal sounds and perform regular engine checks to avoid major troubles.