![]() The labor cost typically falls between $200 and $2000. The valve seals are cheap, and you can expect a cost of $50 to $100 for all of them. ![]() The average valve seal replacement cost is between $250 and $2100 for all valve seals, depending on the car model and labor costs. IN order to reach them, you may have to remove the valve springs, as well. They are located under the valve springs, so you might have to remove the valve cover to see them. The valve seals are located in the cylinder head, under the valve springs, installed around and sealing the valves. Valve seals seldom go bad on modern engines, but it can happen in some rare cases. The valve seals are made of a metallic outer ring and a high heat-resistant rubber sealing against the valve. It prevent oil oil from going into the cylinders and out through the exhaust. The valve seal aims to separate the intake flow and the exhaust flow entering the crankcase. The Function of a Valve Seal A Valve seal around the valve shaft This can cause a heavy performance issue with your car, and it can feel much slower than usual, especially if your catalytic converter is clogged. The valve seals can also be so bad that the valves, spark plugs, and catalytic converter get clogged with burnt oil. If you experience rough idling together with blue smoke, it is definitely time to check your valve seals. It can also be caused by oil clogged on the spark plugs, caused by bad intake valve seals. The car engine is often susceptible to holding a steady low, idling RPM.īecause of this, when a valve seal is bad and there is oil going into the combustion chamber, you might notice rough idling, or you might even stall sometimes. Rough IdlingĪ defective valve seal is easily noticeable when your car is idling. Increased crankcase pressure can result in external oil leaks from different engine sealings, and even cause sealings to pop out completely from the engine. If you have a turbocharged car, the turbo pressure can go past the intake valve seals if worn, which causes the pressure in the crankcase house to increase. If you notice bad oil consumption together with any of the other symptoms here, it is a good time to give your car to a mechanic for a look. ![]() Bad Oil ConsumptionĪs we discussed before, both a leaking intake and exhaust valve will cause the engine oil to pour out into the exhaust pipe.Ī normal engine contains around 4 liters of engine oil, and if you keep driving your car with leaking valve seals, you may notice the oil level going down. This oil is most likely coming from a leaking intake valve sealing or a failed turbocharger. This oil will burn into the spark plug and create clay, which will stay there. If you recently replaced your spark plugs and noticed that there was some strange clay on the spark plug tips, it is most likely coming from burnt oil after the combustion. You will notice that the blue smoke lasts longer than before and does not disappear, even at high speeds. It can also be an exhaust valve seal leaking, which will push oil directly out to the exhaust pipe, causing it to evaporate.Īs the problem worsens, the smoke becomes worse and worse. This can be caused by a leak in the intake valve seal, which causes the engine to consume and burn oil inside the combustion chamber. The most common symptom of a bad valve seal is blue smoke from the exhaust pipe. Here is a more detailed list of the signs of a bad or failing valve seal to look for: 1. ![]() External oil leaks, bad fuel consumption, or rough idling are other signs to look for when your valve seals are bad. You may also notice oil on the spark plugs if you inspect them. The most common symptom of bad valve seals is blue smoke from the exhaust pipe. Valve Seal Replacement Cost Symptoms Of A Bad Valve Seal
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