Nissan 240SX Valve Stem Oil Seal protects the combustion chamber from oil while allowing a small amount to slide down the valve guides, retaining power and minimizing smoke. Surrounding each valve stem is a Valve Stem Oil Seal that meters oil to the intake and exhaust valves, allowing them to open and close cleanly as the lobes of the camshaft drive the valvetrain. The Valve Stem Oil Seal allows the cylinders to maintain proper compression by preventing an excess of oil, which is important for the 240SX four-stroke cycle of intake, compression, power, and exhaust. The presence of blue smoke in the exhaust and fouling of the spark plugs may result from failing Valve Stem Oil Seals, which allow oil to leak past the engine's guides as the engine heats up and the rubber hardens over time. Although the valves of various production years have similar core designs, the similarity is that both overhead valve and overhead cam layouts have the same oil sealing philosophy. The only change is how the lifters, pushrods, or rocker arms transmit motion to the valves. The oil control principle of the Valve Stem Oil Seal doesn't change. Replacing tired Valve Stem Oil Seal restores crisp valve action and prevents oil-burning problems. Replace tired seals in your Nissan 240SX to help it keep running for many more miles while upholding Nissan factory emissions standards.
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