How do i tighten power steering belt on a 1991 Nissan sentra

SOURCE: power steering reservoir for 2008 Nissan Sentra 2.0 S

I had this question initially. However, the Nissan Sentra (starting in 2007) has an electric Power Steering. It DOES NOT need any power steering fluid. The electric power steering is suppose to give you better fuel efficiency and lower maintenance cost.

SOURCE: Power steering leak --a lot

Three areas of concern. A leaking steering rack: By looking under the car, look for the rods which tie the left and right wheels together in the center. By turning the steering wheel fully to the left or right, you can look behind the front wheels 1/2 way down and you will see the rod I am referring to. Following the rod to it source of attachment, it will have a rubber bellows type cover surrounding is as it gets near the center of the car. If the rubber is torn and has oily residue, that is where you are loosing your power steering fluid. It is a leaking power steering rack. A fairly expensive repair, best left to a professional. Buying a used one is a real crapshoot because they are very prone to failure as they get older.
2. The high pressure hoses will leak on these cars. It is difficult to see these without putting the car on a lift because the pump is on the firewall side of the engine. If you notice the fluid dripping near the pump, it is a higher probability than not that it is the high pressure hose than the pump. Also look at the return hose coming from the reservoir, Sometimes the clamps aren't that tight and it will cause a leak, but your description sounds like a leak under pressure.

SOURCE: I WOULD LIKE A NISSAN SENTRA 2008 BELT ROUTING DIAGRAM

THERE SOULD BE A DIAGRAM UNDER THE HOOD ON A WHITE STICKER SOMEWHERE IN THE FRONT OF THE MOTOR.HOPE THIS HELPS. LET ME KNOW. GOOD LUCK

SOURCE: 1996 nissan sentra

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.

SOURCE: 2005 Nissan Sentra 1.8S, with AC - how to replace belts?

first of all you don't have to loosen the pulley,this will no solve the problem,well you already loosen the adjuster,good,bot thing you have not done i will tell you now,on the power steering pump where the belt pass there is also a bolt that hold it ,you must loosen that also,then after you will see the pump moving on the two position that means you will see the belt loosen on 1 position an d the position it will tight the belt,try that man.............