The Valve Stem Oil Seal in a Nissan Sentra will prevent oil from leaking through the valve stems into the combustion chambers. It will restrict the flow to the combustion chambers but will allow enough oil to slip past to lubricate the guides. The small ring is fitted around each stem in synchronization with the constant opening and closing by the camshaft lobes. This allows the valves on every Nissan Sentra engine to seal tightly, build solid compression, and prevent smoky exhaust. When the Valve Stem Oil Seal is unfit, an increased clearance from worn lifters, pushrods, or rocker arms allows oil to be sucked into the cylinders, encouraging carbon, misfire, and the overheated exhaust valves described in factory literature. Because of the positioning differences in camshafts for overhead valve and overhead cam designs, the Valve Stem Oil Seal must work equally effectively when motion travels through pushrods and rocker arms as well as when it drops directly from cam to bucket followers. The Valve Stem Oil Seal meters lubricant to assist valve springs in retaining the seat pressures for which they were designed, protecting against float that could cause piston/valve strikes. Thus, an inspection of the Valve Stem Oil Seal is good measure for any driver that wants a long-lived Nissan Sentra powerplant.
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