Some have a indent that fits 3/8 ratchet on base of arm
If it is a drive belt and not a serpentine belt is has no tensioner. You manually adjust the tension by normally adjusting tension by moving the alternator. Loosen to bolts holding the alternator in place and then adjust the tension. Tighten the bolts when the tension is right. If it is serpentine belt if you follow the belt around the the engine you will see the tensioner.
To adjust the tension pulley on a 1991 Chevrolet Cavalier, first, ensure the engine is off and cool. Locate the tensioner pulley, which is typically near the serpentine belt. Use a wrench or socket to turn the tensioner bolt counterclockwise to relieve tension on the belt, then adjust the pulley as needed. Once adjusted, make sure the belt is properly aligned and retighten the tensioner bolt to secure it.
If it has a serpentine belt it should have an automatic belt tensioner If it doesn't have a serpentine belt then alternator should be the adjustment/pivot point
The zd30 has a hydraulic tensioner using an idler pulley to automatically tension the serpentine belt.
if it is a serpentine belt, there is a tension pully that keeps it tight if is a v blet , u generally adjust the tension by moving the alternator
On a 1994 Jeep Grand Cherokee with a 5.2 V8 engine, the serpentine belt tensioner is located on the front of the engine, near the center. It is typically positioned above the crankshaft pulley and to the right of the alternator. The tensioner is a pulley mounted on a spring-loaded arm, which maintains tension on the serpentine belt. To adjust or replace it, you may need to use a wrench to relieve tension before removing the belt.
To adjust the belt tensioner on an Isuzu pickup, first, locate the tensioner pulley, typically found near the front of the engine. Use a wrench or a socket to turn the tensioner counterclockwise, which will relieve tension on the serpentine belt. If your model has a manual tension adjustment, adjust the tensioner according to the specifications in the owner's manual, ensuring the belt has the correct tension. After adjustments, double-check the belt alignment and tension before reassembling any components.
Serpentine belts have an automatic tensioner, which cannot be adjusted. But your problem sounds like poor alternator performance, have it checked, at your local parts store most do it for free.
There are a few different ways to adjust the drive belt or V-belt tension in a vehicle. The most popular used nowadays is a serpentine belt that connects to and activates every pulley in the engine. These serpentine belts require no tension adjustment as they incorporate an automatic belt tensioner. This type of tensioner has an internal pre-set spring and applies the correct amount of tension to the belt. Some older vehicles and some imports may use a combination of V-belts and serpentine belts in offset pulleys still controlled by the crankshaft pulley. Most often, there are belt tensioners on these vehicles that allow proper tension to be adjusted.
The alternator is usally on an adjustable slide mounted to the engine. If you adjust the alternator on that slide to take the tension off the belt you should be good to go to put the new belt on. The routing diagram for routing the serpentine belt should be on a placard mounted under the hood on the frame. It should also be in your user's/maintenance manual. Make sure to adjust the alternator properly on its slide mount so that there is sufficient tension in the belt.
The serpentine belt tensioner on a 2002 Ford Ranger with a 3.0-liter engine is located on the front of the engine, near the center. It is mounted on the engine block and has a pulley that maintains tension on the serpentine belt. To access it, you may need to remove any components obstructing your view, such as the air intake duct. Use a wrench or a ratchet on the tensioner bolt to relieve tension when removing or installing the serpentine belt.
Assuming you have a serpentine belt on that 3.3L engine, the tension on the alternator would be controlled by the idler (tension) pulley. The alternator is stationary.