1993 G30 Van alternator belt squealing

Disconnect the negative battery cable.
Loosen adjusting bracket nut or bolt and the bottom bolt, then loosen the long adjusting bolt while pushing down on the alternator. Remove the belt.
Unplug wire from top of alternator.
Unbolt the wire from the rear of alternator. Completely remove upper and lower bolt from the alternator. Pry the alt away from the brackets. You may have to use a hammer to tap the spacer back in its hole about 1/4 inch. This is located in the hole where the large bolt went through. Reverse procedure to install.

I have been having the same problem with the alternator belt squealing, most noticeably, when using the heater fan , accelerating, turning the headlights on. I have a 1997 Toyota Tercel CE 1.5L 4cyl with no A/C. I just tightened the belt tight enough that there is no give to the belt and it does not squeal anymore.

I also used a Goodyear Gatorback from Napa belt which seems to be nice and quiet when tight enough.

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BELT ADJUSTMENT
MANUAL BELT TENSIONER
Loosen rear mounting bolts of idler pulley or power steering pump (if equipped). Loosen power steering pivot
bolt and lock nut (if equipped). Turn adjusting bolt to tighten belt to specification. See BELT ADJUSTMENT
SPECIFICATIONS table. Tighten bolts and lock nut to 20 ft. lbs. (27 N.m). For serpentine belt routing, see
For the routing just draw a picture befor romoving the belt. There are 4 different routings and I don't have enough info for yours. Without the proper tool the adjustment spec won't do you any good so before you take off the old belt get a feel of how thight it is and try to match the new one. best thing to do it make it loose enough so it squals when turning the steering
wheel to the extream or stop then tighten the belt little at a time till it doesn't squeal then just go a little bit more. If the belt is too tight it will wear out bearings in water pump,Alt, pullys ect. If its too losse it will squeal and wear out the belt so take your time on the adjustment.

There is a curved bracket that the alternator is bolted to. This allows you to adjust the belt tension. Loosen this bolt and locate the other bolt that mounts the alternator to your engine. Loosen this one, as well. Now swing your alternator in the direction that will allow you to free the belt and remove it. Put the new belt on and swing the alternator to get good tension on the belt. Tighten both of the bolts on the alternator, but leave them loose enough that you can still adjust the belt's tension. Now use a bar to pry the alternator in the direction that will increase the tension on the belt a little bit and tighten the bolt on the curved bracket with your free hand. Now, tighten the other bolt. Start the car and verify that the belt has decent tension and does not slip (this will cause premature wear, squealing and bad charging). If everything is good, you should be all set. If it is too tight or too loose, you will need to readjust the tension of the belt.

Hope this helps,
matt

Try to spray some Anti-Squeal belt dressing on the belt and see if that helps, if not you must likely have a pulley or tensioner thats going bad.

You need to first take off youre serptine belt. Inspect that and generally its a good idea to replace. Next there is a electrical connection on the alternator. DISCONNECT the battery FIRST!!!!!!!!!!!!!!!!!!!!!!!!! then disconnect the connection on the alternator, there are a couple of bolts that attach the alternator to the engine. and then simply bolt on the new one, re-attach the electrical connection and then re-install the (new) belt.

Disconnect the negative clamp on the battery. Remove the bolt on the adjustment arm (the one with the slot) of the alternator. Loosen the pivot bolt at the bottom of the Alt. Swing the alt inward to loosen the belt. Take the belt of the pulley. Take off the wires noting where they attach. Remove the pivot bolt. You should be able to take the alt off now. Reverse the sequence but when adjusting the belt tension pry the side of the alternator with a bar so the belt can only be deflected about three quarters of an inch. Tighten the adjustment bolt. Don't over tighten the belt. It'll prematurely wear your bearings. Don't under tighten. It'll squeal.

Hi,
I found these 3000GT/Dodge Stealth DOHC Serpentine belt diagrams on the link below...
http://www.stealth316.com/2-ac-compressor.htm

If you are re-using the drive belt, be sure to install it in the same orientation as it had before removal (same side facing the wheel well). Insert the belt from above. Turn it "sideways" to fit it in between the alternator pulley and the AC pipe. Correctly tension the drive belt using its tensioner pulley. Before installing the plastic covers and wheel, temporarily install the IC pipes and battery negative cable and start the engine to check the belt operation. If the belt squeals it is either misaligned or too loose. I found that my old belt squealed when installed "backwards" from how it was removed. It did not squeal when installed in the same orientation. If you have messed with both drive belts, spray a little water on one belt at a time to see which is squealing. A misalligned belt will stop squealing for a very short time after water is sprayed on it, but the squealing quickly comes back louder than before. If the belt is loose, the squealing will immediately get louder. Also note that there is just a little play in how the alternator bolts in. If misalignment is a problem, loosen all four bracket mounting bolts (this may require again removing an IC pipe), reposition the alternator, and tighten the bolts to see if this helps. Do not tighten the belt too much because this can lead to shaft bearing failure over time.

Here are some links concerning drive belt adjustment.
http://www.gates.com/brochure.cfm?brochure=1026
http://www.ridgeautoparts.com/tips/the_charging_system1_2.htm
http://www.utfleets.com/library/features/accessory_drive_belts.htm


Your Pal,
Annulusgear

right size belt ? cheap belt ? have battery tested