Ford 2003 Mustang Workshop Manual page 1291

53. Remove the RH and LH timing chain tensioner (RH shown, LH similar).
1. Remove the bolts.
2. Remove the timing chain tensioners.
3. Remove the timing chain tensioner arms.
54. CAUTION: Unless otherwise instructed, at no time when the timing chains are
removed and the cylinder heads are installed is the crankshaft or the camshaft to be
rotated. Severe piston and valve damage can occur.
CAUTION: Do not remove the special tool from the camshafts.
Remove the LH and RH timing chains and the crankshaft sprocket.
Remove the RH timing chain from the camshaft sprocket.
Remove the RH timing chain from the crankshaft sprocket.
Remove the LH timing chain from the camshaft sprocket.
Remove the LH timing chain from the crankshaft sprocket.