How Many Kilometers Should the Exhaust Valve Be Replaced?
2 Answers
Exhaust valves are generally replaced every 100,000 to 150,000 kilometers. Working principle of the exhaust valve: The exhaust valve, also known as the oil separator or pressure control valve, is installed between the compressor outlet and the condenser inlet. It improves heat transfer efficiency in the condenser and evaporator through separation. The high-pressure gas (gaseous working medium and lubricating oil) from the compressor enters the exhaust valve and passes through the guide vanes, forming a spiral flow. The lubricating oil is separated from the working medium gas by centrifugal force and gravity, flowing down along the inner wall of the cylinder. The working medium gas is discharged from the center pipe of the exhaust valve through multiple baffles. The separated lubricating oil accumulates at the bottom of the oil separator and can be periodically drained or automatically returned to the compressor's crankcase via a float valve. Symptoms of a damaged exhaust valve: Difficulty starting, engine shaking, unstable idle, weak acceleration; blue smoke from the exhaust pipe when the car burns oil; the engine fault light on the dashboard illuminates.
From my experience in car repair, the PCV (Positive Crankcase Ventilation) valve is a component in the vehicle's engine that manages the emission of crankcase gases. If it's not replaced for too long, it can clog the intake system or cause rapid oil contamination. Generally, it's recommended to inspect it every 40,000 to 60,000 kilometers, and it's best to replace it with a new one. However, the exact interval depends on your car's type and usage habits. For example, if you frequently drive short distances or operate in high-pollution environments, you should replace it earlier. I've seen many car owners wait until the engine emits white smoke or has unstable idling before coming in for repairs—these are symptoms caused by a faulty valve. Not only does this waste fuel, but it can also damage engine sensors. Addressing it early saves money and hassle, which is why I always emphasize the importance of regular maintenance.
