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loosen the alternator slide it forward to the point where you slip the belt off . then you take a 14mm wrench or socket to turn the center bolt in the pulley counterclockwise till it comes off . reverse t6he process to put thwe new one on.
Click on the following free direct Link. It has several Diagrams including the correct Serpentine/Drive Belt Diagram for your 1996 Nissan Sentra 1.6L DOHC In-Line 4-Cylinder. Included are Instructional and Directional Diagrams including how to remove/replace your Alternator Belt and set the proper Tension.
Using a short socket of appropriate metric value, and a pry bar; Push the pry bar toward the firewall to loosen the tension on the belt. It's not that hard once you buck the initial spiral spring pressure of the tensionor. I have even pryed against the tensionor with a blunt heavy bar and moved it enough to free a belt.
Disconnect
and label the wiring harness connections to the alternator (Painters
Masking tape works very well for labeling Automotive wiring).
Loosen the alternator pivot bolt.
Remove the bolt that attaches the alternator to the adjustment arm.
Rotate
the alternator to loosen the drive belt and disengage the belt from the
pulley. Be careful that any spacers that are used in mounting are kept
with their original bolts. This will make correct reinstallation much
easier.
While supporting the alternator remove the pivot bolt.
Remove the alternator from the vehicle.
To reinstall the alternator, reverse the removal procedure.
To
adjust the belt tension, leave the pivot and adjusting arms loose. Look
up the belt tension specification for the vehicle you are working on.
Using a belt tension gauge on the belt apply pressure to the alternator
until the correct belt tension registers on the gauge and tighten the
mounting and adjustment bolts to the specified torque specification.
CAUTION
Over
tightening of the alternator drive belt will cause the unit to whine
and premature failure of the alternator drive end bearing, the water
pump or the engine crankshaft.
Ok. There should be a tension pulley on the engine that the belt runs through. You can notice it because it is not attached to anything except the engine block or a support bar. You can lift if up or push it down with a wrench or socket and wrench. It moves so it can give you space to put the belt on. After the belt is on, release teh pulley and it will tighten up (tension) your belt and your done.
If by chance you do not have this tension pulley, then you have to only put one bolt in the altenator, put the belt on like normal, pry the altenator in place with the belt on it, then put the last bolt in.
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