WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
The camshaft chain sprockets must be oriented correctly.
Fig 1: Installing Lower Chain Sprocket And Camshaft Sprocket
Courtesy of FORD MOTOR CO.
Install the lower chain sprocket and the camshaft sprocket.