Warm up the engine and leave it to idle until the cooling fan turns on. Increase the crankshaft speed to 2500 min for 2-3 minutes.
Make sure that there is no noise from the operation of the hydraulic tappets. If it is audible with a stethoscope, then stop the engine and remove the cylinder head cover.
Set the automatic transmission/manual transmission selector lever to the neutral position. Apply the parking brake. Rotate the crankshaft only by the vibration damper center bolt until the camshaft lobes of the cylinder being tested are in neutral.
Try to move down the cylindrical pusher using a wooden or plastic wedge (pic. 3.132).
If at the same time the free play of the hydraulic pusher exceeds 0.1 mm, then it should be replaced.
Attention! After replacing the hydraulic tappet, hold for 30 minutes before rotating the engine camshaft.