Question about 1993 Pontiac Grand Prix

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I replaced my alternator and don't know how to get my serpentine belt back on

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Most serpentine belts mount so the groved side of the belt wraps around the grouved pulleys and the smooth side wraps against the smooth pulleys (usually the tensioner). When you figure out the path of the belt, then release the tensioner tension and install the belt. then reapply the tensioner tension. Some tensioners are the alternator. Some tension with the Power Steering Pump. But most, nowadays, just have a spring loaded tensioner that can be held in the untensioning position with a socket wrench or open end wrench untill the belt is on then you just let the spring apply the tension to the belt and remove the wrench and you are done. If you have to tension the belt with the alternator or another component in the belt path, the tension usually needs to be such that light pressure (5-10#) on the belt will cause it to deflect no more than an inch over a 10" or so span between pulleys. If when started, it slips then tighten it a little more. Start it up and check for slipping, and repeat the process until it does not slip any more. It is important to make sure that the belt and pulleys do not have grease or oil on them causing the slipping. I can cause premature bearing wear if the belts are too tight.

Posted on Sep 08, 2010

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  • 2

    Follow the serpentine (outer) belt to the three pulleys lined up vertically near the front of the engine compartment. Locate the middle pulley, which is the tension pulley for the belt.

  • 3

    Loosen the bolt on the middle pulley with a socket wrench by turning counter-clockwise. Do not remove the bolt, just turn it a couple of times. Loosen the tensioner bolt on the side of the of the pulley, facing the front of the vehicle.

  • 4

    Remove the serpentine belt and then loosen the bolt on the alternator. With the alternator loose, move it forward so that the alternator belt loosens up and then remove belt from the pulleys.

  • 5

    Install the new alternator belt by placing it over both inside pulleys. Tighten the tension on the alternator belt by moving the alternator back and keeping tension on it by holding it back with a long screwdriver. While the alternator belt is tight, use a socket wrench to tighten up the bolt on the alternator.

  • 6

    Place the serpentine belt back on the pulleys and then use a socket wrench on the bolt on the front of the tension pulley. Once the serpentine belt is tight, tighten up the bolt in the middle of the tension pulley.

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    Start the Mitsubishi Lancer's engine to test the alternator belt and make sure it is working properly. Once you have verified it is working, turn the engine off.

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    Altenator


    Unplug the alternator remove ground to motor.
    Remove serpentine belt.
    remove 2 bolts which hold alternator.
    replace reverse of removal.
    4 out of 10 difficulty.
    Only special tool you will need is a wrench long enough to pull back the tensioner.
    See the radiator support for location of tensioner and serpentine routing.
    While its off, i would suggest replacing the belt too.

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