What are the causes of engine air leakage?

[Joel]

The causes of engine air leakage are: 1. Failure of the parking solenoid fuel inlet valve; 2. The fuel tank suction valve is not opened; 3. Blockage in the fuel supply line or diesel filter; 4. Air in the fuel supply system; 5. The fuel transfer pump does not supply fuel; 6. Faulty fuel injection pump; 7. Incorrect fuel injection timing; 8. Leakage in the cylinder head gasket; 9. Poor sealing between the valve and valve seat; 10. Insufficient or broken valve spring tension; 11. Damage to the cylinder liner and piston rings; 12. Piston rings stuck in the piston ring groove due to carbon deposits; 13. Air leakage at the fuel injector installation hole. The solutions for engine air leakage are: 1. Clean carbon deposits in the cylinder; 2. Readjust the valve clearance; 3. Replace the valve or valve seat ring.

[McElle]

Engine air leakage is no small issue, and I've encountered it several times myself. The most common cause is worn piston rings. Over time, they can deform, allowing gas to escape from the cylinders, leading to reduced compression and noticeably weaker performance. Valve-related problems are also frequent, such as aging valve seals or carbon buildup on the valve stems, which prevent the valves from closing tightly. A damaged cylinder head gasket is another major culprit, as it can crack and leak under high temperature and pressure. Other issues like scratches on the cylinder walls or aging seals, such as a faulty crankcase gasket, can also cause gas leaks. When there's a leak, the engine loses power, fuel consumption increases, and sometimes blue smoke appears. It's crucial to address these issues promptly to prevent more severe damage. Regular maintenance and inspection of these components can effectively prevent such problems.

[StIsabel]

After decades of driving, I've found that engine air leaks are mostly related to wear and tear. Over time, piston rings wear thin and deform, reducing compression efficiency; valve issues are also common, especially with damaged valve seats or failed seals; cylinder gasket erosion frequently occurs in high-temperature engines, allowing gases to escape through gaps. These issues not only make the engine feel sluggish and lack power but also lead to excessive exhaust emissions and smoke. Additionally, in turbocharged vehicles, aging or cracked sealing rings can also cause air leaks. Early detection and replacement of these components can save fuel and ensure safety.

[SanMolly]

There are several basic reasons for engine air leakage. If the piston rings are damaged, compression leaks occur; if the valves do not close tightly, gas escapes; and if the cylinder gasket cracks, it will also leak gas. These issues can cause the engine to lose power and increase fuel consumption. Regular inspection and maintenance are crucial.