Where do I find the tension pulley so I can remove the belt associated with the alternator - my BMW is a 2001, CP/330 ci

Nissan xterra alternator removal and installation - YouTube

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How to Change an Alternator : Removing the Serpentine ...

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Dec 14, 2012 - 10 posts - ‎3 authors

adjust ur belt by following steps
now that you know where the components are these components are driven by a belt. So when you turn your AC on there’s a belt that’s driving the AC compressor, when you turn the stirring wheel and you have that nice that easy feel of turning the stirring wheel when you’re parallel parking your car that’s the power stirring pump doing its job. Your alternator is keeping the battery charged, the lights on and the engine running. So I want to show you where the belts are, what they look like, how to adjust them and how to tell a bad belt from a good belt. As you can see these are your drive belts, this is the AC drive belt it drives the AC compressor, this is the alternator drive belt it drives the alternator, if you look down here you can see this is where the adjustment is on that AC compressor belt, if you look right here this is the top adjusting bolt for adjusting the alternator either up or down to tighten or loosen the belt. There’s a bolt down here that locks the alternator in place and this bolt is the pivot bolt for the alternator. So if you’re going to let’s say remove your alternator belt you’d have to remove these covers, loosen this bolt, loosen this bolt that’s underneath this cover and adjust this bolt to either lower the alternator or raise the alternator, if you’re belt was too loose you’ll pull up on the alternator, if the belt was too tight you’ll

I believe you are referring too the Accessory Drive Belt for the Alternator...See attached drawing



To Remove:

1. Raise and support the vehicle.
2. Remove the engine splash shield.
3. Rotate the drive belt tensioner clockwise to release the drive belt tension.
4. Remove the drive belt from the alternator.
5. Slowly release the drive belt tensioner.
6. Remove the drive belt from the accessory drive pulleys.

To install:

1. Install the drive belt to the accessory drive pulley.
2. Rotate the drive belt tensioner clockwise.
3. Install the drive belt to the alternator.
4. Ensure the drive belt is properly aligned and seated into the grooves of the accessory drive pulleys.
5. Slowly release the drive belt tensioner
6. Install the engine splash shield.
7. Lower the vehicle....saailer

I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

You don't adjust the tension. The tensioner on that serpentine belt is spring loaded and never needs adjustment.
On a 2001 with normal miles (~125k), you should be on your second tensioner pulley and your third serpentine belt by now.

you need to push back the tensioner then it will be the right length.Dosent the engine or the underside of the hood have a diagram?

it is likely hooking on somthing or you forgot to remove the drive shaft

Removal & Installation

1. Raise and support the vehicle.
   
2. Remove the engine splash shield.
   
3. Rotate the drive belt tensioner clockwise to release the drive belt tension.
   
4. Remove the drive belt from the alternator.
   
5. Slowly release the drive belt tensioner.
   
6. Remove the drive belt from the accessory drive pulleys.
   

To install:

1. Install the drive belt to the accessory drive pulley.
   
2. Rotate the drive belt tensioner clockwise.
   
3. Install the drive belt to the alternator.
   
4. Ensure the drive belt is properly aligned and seated into the grooves of the accessory drive pulleys.
   
5. Slowly release the drive belt tensioner
   
6. Install the engine splash shield.
   
7. Lower the vehicle.
   

Accessory drive belt routing—1.5L engine


Accessory drive belt routing—2.0L engines


Accessory drive belt routing—2.4L engines


Accessory drive belt routing—2.5L and 2.7L engines


Accessory drive belt routing—3.0L and 3.5L engine

the tesioners (a/c and alternator) are where you will release the tension on the belts. usually the will be a 16mm hex that you can turn and hold to release the spring pressure from the belt.

If you are just replacing the pulley and not the tensioner itself, use a small flat blade screw driver to pry off the dust cover. Before removing the belt loosen the bolt in the center of the pulley. It is usually a 6mm allen bolt.

Here you go.. I looked up the same belt you did, it should be right.