The purpose of the Jeep Wagoneer Valve Stem Seal is to prevent engine oil from leaking by the valve guides into the combustion chambers. This helps preserve engine power and keep smoke out of the exhaust. The tiny rubber lip encircles each stem and allows passage of only a thin lubricating film, shutting off the surplus flow. The Valve Stem Seal cuts down on valve guide wear and helps lifters, pushrods, rocker arms, springs, and cam-driven valves maintain compression and prevent misfire due to plug-fouling. The same successful Valve Stem Seal design appears on classic and modern Jeep versions as it already provides free stem movement with effective sealing. Irrespective of whether the SUV uses an early OHV block or a later OHC head, each Wagoneer will benefit when the Valve Stem Seal retains its pliability and the accompanying springs snap the valves shut. The heat, mileage, and growing lash will harden the seal and allow oil to sneak by. Timely replacement of the Valve Stem Seal helps restore the crisp throttle response owners expect from a Jeep Wagoneer powerplant to keep each Wagoneer rolling cleanly for faithful Jeep fans.
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