Ford 2003 Mustang Workshop Manual page 1323

46. Position the RH (outer) timing chain on the crankshaft sprocket, aligning the copper (marked)
link with the timing mark on the sprocket.
47. Install the RH timing chain on the camshaft sprocket, aligning the copper (marked) link with the
timing marks on the sprocket.
48. Position the RH timing chain tensioner arm on the dowel pin and install the RH timing chain
tensioner.
49. Remove the retaining clip from the RH timing chain tensioner.