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Disconnect the battery.remove the serpentine belt.Unbolt the pulley.
purchase a pulley remover and installer tool, then write baack when you have it.
The tension pulley should have a bolt that holds it on, allowing you to replace the unit.
there is a special took that you can purchase that you have to insert into the tensioner and pull it up slowly and take off the belt, do the reverse to put it on
replace 1996 nissan 200sx se 1.6 tension pulley
Loosen bolt in tension pulley, then loosen tension bolt. Replace belt. Tighten tension bolt. Last, tighten bolt through pulley.
Replace the tensioner assembly as one piece.
Call the parts store. They will be able to tell you if the pulley is available separately or not.
There should be a "square" cut into the pulley bracket that fits either a 1/2 inch or 3/8 inch ratchet or breaker bar to allow you to remove tension from this pulley allowing you to replace the serpentine belt.
with a 9/16 socket and ratchet
I used a breaker bar for the tension pulley to relieve the tension to remove the belt, I think there are three bolts that hold the tension pulley on, just remove them and reverse the procedure to install. Follow the diagram that is either on the inside of the hood or on the radiator cover on how to thread the belt back on the pulleys.
replace the belt with a goodyear bet