The Jeep Liberty Valve Stem Seal is a tight but flexible gate that prevents engine oil from entering the combustion chambers while allowing the valve stem to move around. The Valve Stem Seal helps maintain compression, reduce smoke, and enables the valves in a Jeep engine to quickly open and close due to camshaft lobe action by hugging the stem. As miles add up and heat builds, the seals can get worn and allow burning oil to pass, increasing oil consumption and fouling the plugs, making good seals just as important as good springs and lash control in any Liberty powerplant. Since the production run, Jeep has fitted overhead valve designs with lifters, pushrods, and rocker arms on early Liberty models, then heads with overhead cam and buckets on later editions, but both designs still generally rely on a correctly sized Valve Stem Seal to keep oil apart from the air fuel flow. Regarding the Valve Stem Seal, no alternate styles were applied, only changes in size to suit the heads. Its purpose remained the same for every Jeep Liberty. The fifth and final Valve Stem Seal illustrated its purpose.
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