Description
Function of the Hydraulic Lifter
The hydraulic lifter (hydraulic tappet) uses oil pressure to automatically maintain zero valve lash (clearance) in the valvetrain. This self-adjusting mechanism eliminates the need for manual valve adjustments and ensures quiet, efficient valve operation. A faulty hydraulic lifter causes a distinctive ticking or clattering noise, especially on cold starts, and can lead to misfires and poor performance.
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