Lifter / Lash Adjuster: Description and Operation

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(Part 2 Of 2):

Hydraulic lash adjusters (HLA) provide automatic valve lash adjustment. The HLAs ride between the camshaft lobes and the top of the valve stems. Any clearance between the lobes and the valve stems is taken up by the hydraulic expansion of each HLA. The HLAs are designed, therefore, to maintain a 0 mm (0 inch) clearance between the camshaft lobes and the valve stems.