Kia Optima Lash Adjuster makes the sedan valve train very quiet and efficient by adjusting the optimal gap between each lobe of the cam and its corresponding valve. The Lash Adjuster resembles a mini hydraulic pump and works with engine oil pressure to inflate an internal plunger, removing clearance and allowing the valves to open and close smoothly and precisely. Earlier Optima engines applied solid Lash Adjuster components which required regular feeler gauge adjustments; however, subsequent Kia power plants applied hydraulic Lash Adjuster components which automatically self-corrected as the oil flowed, eliminating the need for periodic adjustment by the owner and reducing valve train wear. Fitted to overhead valve layouts with pushrods or in designs with double overhead cams where the bucket style Lash Adjuster elements are fitted directly underneath the cam, the aim remains the same: friction is reduced and the life of the component is extended. Kia also experimented with roller lifters across the Optima family, but hydraulic units remained the choice, providing an easier and lighter route to reliable performance.
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