3.0L And 4.0L Engines
Disconnect the negative battery cable.
With the vehicle in neutral, position it on a hoist.
Remove the splash shield.
Rotate the accessory drive belt tensioner clockwise for 2001-2004
models and counterclockwise for 2005-2006 models. Remove the belt.
To install, reverse the removal procedure.
All Navajo and B Series Pick-up
engines utilize one wide-ribbed V-belt to drive the engine accessories
such as the water pump, alternator, air conditioner compressor, air
pump, etc. Because this belt uses a spring loaded tensioner for
adjustment, belt replacement tends to be somewhat easier than on engines
where accessories are pivoted and bolted in place for tension
adjustment, such as the MPV. Basically, all belt replacement involves is
to pivot the tensioner to loosen the belt, then slide the belt off of
the pulleys. The two most important points are to pay CLOSE attention to
the proper belt routing (since serpentine belts tend to be "snaked" all
different ways through the pulleys) and to make sure the V-ribs are
properly seated in all the pulleys.
Fig. Belt routing diagram-3.0L engines
Fig. Belt routing diagram-4.0L engines
Although belt routing diagrams have been included in this section,
the first places you should check for proper belt routing are the labels
in your engine compartment. These should include a belt routing diagram
which may reflect changes made during a production run.
Take a good look at the installed belt and make a note of the
routing. Before removing the belt, make sure the routing matches that of
the belt routing diagrams. If for some reason a diagram does not match
(you may not have the original engine or it may have been modified,)
carefully note the changes on a piece of paper.
Disconnect the negative battery cable for safety. This will help
assure that no one mistakenly cranks the engine over with your hands
between the pulleys.
For tensioners equipped with a
inch square hole, insert the drive end of a large
breaker bar into the hole. Use the breaker bar to pivot the tensioner
away from the drive belt. For tensioners not equipped with this hole,
use the proper-sized socket and breaker bar (or a large handled wrench)
on the tensioner idler pulley center bolt to pivot the tensioner away
from the belt. This will loosen the belt sufficiently that it can be
pulled off of one or more of the pulleys. It is usually easiest to
carefully pull the belt out from underneath the tensioner pulley itself.
Once the belt is off one of the pulleys, gently pivot the
tensioner back into position. DO NOT allow the tensioner to snap back,
as this could damage the tensioners internal parts.
Now finish removing the belt from the other pulleys and remove it from the engine.
While referring to the proper routing diagram (which you
identified earlier), begin to route the belt over the pulleys, leaving
whichever pulley you first released it from for last.
Once the belt is mostly in place, carefully pivot the tensioner
and position the belt over the final pulley. As you begin to allow the
tensioner back into contact with the belt, run your hand around the
pulleys and make sure the belt is properly seated in the ribs. If not,
release the tension and seat the belt.
Once the belt is installed, take another look at all the pulleys to double check your installation.
Connect the negative battery cable, then start and run the engine to check belt operation.
Once the engine has reached normal operating temperature, turn the ignition
and check that the belt tensioner arrow is within the proper adjustment range.
Hope helps (remember rated and comment this).