Whenever servicing and repairing the lifter and lash adjuster for in-vehicle camshafts, first remove the cylinder head cover, then the
Rocker Arm and then each hydraulic lash adjuster one at a time. If you want to reuse the lash adjusters, mark each one for correct use and servicing as a set. Before putting in each hydraulic lash adjuster, check that engine oil almost touches the plunger as the lifter is depressed; then attach each adjuster and its rocker arm, repeating this process with each adjuster and install the cylinder head cover last.