This process is elaborate and some specialized equipment is used, more so, the engine has to be pulled out of the car. This type of repair can be particularly dangerous in case of a mistake, therefore it is always important to complete such a repair with prior experience. This should be done by first lowering the engine and fixing it on an engine stand to work on it. Hold the camshafts and crankshaft with aid of the special tools to bring the engine to TDC, and for 2001 and later models, remove the intake manifold, fuel rails, and valve covers. Then, replace the lower oil pan cover, the oil pump pickup tube and the crankshaft reinforcement section or merely the bolts through the timing cover. Lift off the front cover of the engine block-it is worth knowing that in this engine, the camshaft timing chains and the oil pump are driven by the jack shaft. The left and right cylinder bank camshafts are connected through chains; the front of the jack shaft powers while the rear powers the right camshaft; four-wheel drive models have a balance shaft assembly linked to the crankshaft sprocket. Take off the jack shaft chain tensioner and guide, take also the jack shaft sprocket and the chain. If not already done, extract the top cassette bolt and the camshaft sprocket, the next is the lower cassette-to-block bolt and finally extracting the assembly casset, chain and the jack shaft sprocket. For the correct camshaft chain, unscrew and locate the large plug at the rear of the jack shaft; replace with new plug when rebuilding. Special wrench Torx bolt and spacer off, then the cassette bolt, chain and cassette off. You should also turn the engine over by hand at least twice before the ignition is switched on in order to check whether there is any stiffness when the crankshaft is being turned. Make sure that there is number one piston at top dead centre, then fit the left cylinder head camshaft timing chain cassette and wrap the remain chain with a rubber band before tightening the rear jack shaft sprocket bolt. Fit the proper camshaft chain and cassette, hook the jack shaft chain down over the sprocket and engage this in to the crankshaft sprocket. Loosen the jack shaft sprocket bolt, put on the jack shaft chain guide and tensioner, remove the debris before putting on a new gasket reinforced with RTV sealant. The rest of the removal process is done in the reverse manner; the timing procedure must be done without fail using special tools and in the end running of the engine to check for oil or coolant leaks.
Posted by FordPartsGiant Specialist 
