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Your harmonic ballancer is shot.
With the engine off , key out of the ignition... grasp the belt that goes down to the engine crank and see if you can make it turn a little ... if you can , you will see that the outside of that bottom most pully turns ... while the crank does not...
Replace the harmonic ballancer with a new unit... ( used ones are 90% junk by the time you get em from a bone yard...)
There is a cut out on the passangers side to access the bolt you need to take out... it is behind the tire , so the tire must be removed to access it...
easy fix ya !
You need to check the pulley for your ac and make sure that it still turns freely, sometimes they lock up and that is what will throw the belt. But you have to take the belt in front off first then put that one on it only goes from the harmonic ballancer to the ac. but you would need to make sure the tensioner works and that is not locked up as well
One problem pops into head when I think about your description of the problem. The bolts that hold the pressure plate to the flywheel may be too long, causing the engine block to interfere with the rotation of the flywheel.
I have managed to open the harmonic damper bolt. This bolt opens in the counter clockwise rotation. A breaker bar was used with the flywheel locked in place. In order to get to the flywheel, the starter motor was removed to get access. The manual suggest removing the bell housing plate. This takes more effort and one of side engine mount also need removal. I decided to remove the starter motor instead. In order to remove the starter motor, first remove the cables from the starter motor and three mounting bolts. Secure a rod or a screw driver between the flywheel and bell housing through a hole in the flywheel. The size of the size is about 1/2". This hole was visible when the engine is set to TDC (top dead center).There could be more than one hole but I did not try to rotate the engine to find out. Once the rod or the screw driver in place in the flywheel, use the 22mm socket head and breaker bar and undo the harmonic damper bolt counter clockwise (CCW).I believe an impact air gun could do this job as well.The spec on the bolt is 100 ft lbs torque - Hendry
YES YOU DO HAVE TO HAVE A SPECIAL ADAPTER FOR THE NORMAL BALLANCER PULLER. NAPA HAS THE TOOL AND THE # IS BK700-2461. ONCE AGAIN THE ADAPTER IS USED WITH THE BALLANCER PULLER YOU ALREADY HAD. YOU HAVE TO SCREW THE EXTENSIONS INTO THE BALLANCER AND INSERT ANOTHER EXTENSION INTO THE CRANKSHAFT TO GET THE OLD ONE OFF. WHY G.M. DID THAT TO US IS STILL A MYSTERY.