Before working on the hydraulic lash adjusters, remove the cylinder head cover(s) and
Rocker Arm(s), take note of where everything is positioned for reassembly if kept or reused. After that, take out the lash adjuster(s). Ensure the lash adjuster is filled with at least some oil before installing, telling you it is ready when the plunger travels slightly. When everything is done, install the rocker arm(s) and cover the cylinder heads again.