A little movement is normal,
a lot of movement can cause fuses to blow, or burn up things like computer, radio, and backup camera. It should 've no more than 14.5 volts. Also look tension on pulley to loose can give same results.
SOURCE: Engine replacement 1996 Chevy Blazer
I just replaced my engine in my 1996 blazer myself. Body need not come off, but what an ordeal if its a 4 X 4.
SOURCE: how do I release the belt tension pully to replace serpentine belt
You can run down to your local auto parts store and buy a serp belt tool. Or you can take a 3/8 drive ratchet, locate the 3/8 square hole in your tensioner and put the ratchet in the hole. For more leverage I put a deep socket over the ratchet handle and put a long 3/8 extention in the deep socket. This will provide ample leverage and will save buying more tools you do not need. Simply move the tensioner to the direction that takes pressure off of the belt.
SOURCE: how do you check the idler pully to stop squealing?
NO ADJUSTMENT IS PROVIDED FOR, THE BLET NOISE MAY BE DUE TO A DEFECTIVE IDLER
SOURCE: Serpentine belt diagram for 2003 chevy cavalier 2.2l ohc
That pulley is the tensioner pulley. It is either manual or automatic. If it is a manual tensioner, the bracket that it is attached to it should have a square hole located on it bracket somewhere. This whole will look inoculous, but will be offset from the pulley. If you have a 3/4" socket wrench, you'll notice it fits nicely into this hole.
You use this hole (and the wrench) to twist the whole bracket and apply tension while you tighten the bracket itself down.
An automatic tensioner will have a spring inside and would pretty much work by itself when a belt of the proper length is installed. Your Hanynes manual would have already alerted you to how to adjust an automatic tensioner.
I hope that helps.
BTW, the tensioner pully usually rests on the back (flat) side of the belt and has no device attached to it.
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