Use hose one end in ear, other to poke around to listen where the sound is coming from. If really from bottom end this engine has bad rod bearing = overhaul time. If from top of engine may be valve tappet noise. Not good either.
Usually that's a wrist pin.
SOURCE: engine noise
You have the 5.4 3 valve engine in your Navigator, Ford has had various problems with noise from this motor. The cost of repair will vary because this noise cam come from different places, such as cam phasers, valve lash adjusters and sometimes the ticking noise is actually coming from the injectors which is considered normal. I would have it checked out by the dealer. -Jared
SOURCE: Noise in right bank of V6 engine
this engine produces timing chain noises at aprox. 50.000 miles (80000kms) depending oil service intervals
SOURCE: The blower motor in my 2005 GMC Sierra won't turn
passenger side under dash by blower there is a thermistor that is fried remove it from housing and replace
SOURCE: The rear a/c is making a clicking sound/2003 Lincoln Navigator
you have a bad blend door actuator the clicking sound you hear is the plastic gears inside it slipping the panels covering rear unit can be removed once removed cut a/c on once clicking starts you should be able to tell which one it is they are about the size of a cell phone usually twoo or three screws holding on to air box and one small electrical connector remove and call ford dealership with part# listed on the actuator and purchase new one these are not available aftermarket that i know of
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