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a slight wable is common on many of these. I would be more concerned with the belt tensioner and belt. But the crank pully can be done in your driveway. You will need to go to parts store and rent the pulley removal tool that is specific to this engine.
is it a loose fan belt this will make a scretching noise thats the cheapest thing expensive things if its a manuel could be a thrust bearing on the gear box or worse still an imput shaft bearing on gear box but i think it will be just the fan belt screeching
The water pump is directly behind your fan clutch. Most probably, it's the pump. Shaft seal is already worn out (maybe because of damage bearing). You have to replace the whole assembly or replace the shaft, seal, and bearing. These items are within the repair kit that you can buy in parts store.
If your belts are in good shape and tension is proper, you should take off the belts and srin each pulley or tensioner that turns with the belt. I think that you will find that a bearing is going bad. Try to do this when the engine is cold for that will usually make the noise more pronounced.
Now its a couple of things that may be wrong...1 is your waterpump may be bad, and the shaft is wobbling back and forth...2. it could be your fan clutch...or 3. it just maybe the fan blade itself..sometimes they wear out, because they are made up of plastic...however you can easliy see that, and move it around..and make sure all the bolts are tight..
So. check the waterpump, by tring to shake the fan up and down and side to side, and see if the shaft move, then its the waterpump...the clutch really wont give you too much play, it just wont spin as fast, with the engine running, Or the blade..basically it will look like its fallen off....
This problem may be very easy to fix. It may be your belt on the motor, could be the alternator belt, main serpentine belt etc. Check all your belts, you should only have about an inch of play in all the belts, any more than that the belt will slip across the pulleys causing them the squeal.
If it is the water pump bearing, check and see if your fan that is mounted to the water pump is loose, or moving all over the place. You will see the pulley that the fan is mounted to moving likes its about to fall off. In that case you will need a new water pump. Hope this helps!
When you have the belt off, spin that idler pulley and see if it turns easily or makes noise. Check if the bearing feels good and smooth or if it wobbles any. While you are at it, check the fan and fan clutch to see if they turn smoothly also. There should be some resistance to the fan clutch, and make sure the fan isn't rubbing on anything.
Replacing the idler pulley is usually done as a unit since the bearing is part of the pulley.
remove the 4 nuts in front of fan,,, pull fan off ... then fun part... gotta jar it up and down all the while pulling... shake it even!! but watch how much pressure you have or you will smash fingers on ac condensor when it does give lol then the pullies will easily pull off leaving i think 3 bolts holding the mount on.