How To Stop Alternator Belt Slipping. If they get on the belt it may cause slipping and damage to the belt surface. Test the tension at the area where the belt is the longest.
You have to find the tensioner pulley and move it enough so the belt slips off. What i did was add more belt area to the alt. Removing the alternator belt from the pulley can be tricky.
Grab this center point and try to move the belt; Faulty or worn out tensioners will also be solved by regular maintenance and especially by using quality parts. My plan is to first loosen the pivot bolt on the bottom of the alternator, then loosen the set block bolt and use some leverage (instead of the adjusting bolt/screw) against the a/c compressor and hopefully get more appropriate tension on the alternator belts so they are equally tensioned and don't squeal.
I used an old vortech idler and bolted it just off to the side of the main alt bolt. I was able to make the belt work and fit with the factory tensioner and clear the water pump, but it still slipped. If they get on the belt it may cause slipping and damage to the belt surface.
Turning off your engine is the very first step, do not let the engine sit and run while you apply soap to your car. It can be purchased at any auto shop; What i did was add more belt area to the alt.
Also, check the alignment of the belt on the pulleys, they should line up straight. Inspect the pulleys by looking for any buildup of deposits or worn spots where the belt could catch and become damaged. I wonder if the alternator pulley slot profile matches the engine pulley and the water pump pulley.
If it doesn't hold after that, you need to look at bent brackets or lock nuts. Reverse the ratchet direction and hold. Then offer it into the pulley.