Sounds like your technician is not doing it properly-See below
NOTE: Engines are assembled with black composite cam covers.
Remove Positive Crankcase Ventilation (PVC) valve hose.
Remove cam cover fasteners.
Remove the cam cover assembly.
NOTE: Inspect the cam cover isolations for cracks. Replace the isolators if deterioration exist. Gaskets over one year old may take a set and should be replaced. Gaskets under one year old do not need replacement. A small drop of RTV must be installed at the two T-joints whenever the cam cover is installed.
Install new cam cover gaskets, if removed.
Install the cam cover assembly.
Install the PVC valve hose.
Images (Click to enlarge)
Saturday, March 19th, 2011 AT 3:46 AM