Valve Train Analysis - Engine Off, Valve Spring Retainer and Valve Spring Retainer Keys

WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.

Check for correct seating of the valve spring retainer key on the valve stem and in valve spring retainer.
Check for correct seating on the valve stem.