Question about 1986 GMC G2500

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I want to remove the alternator on my 1986 GMC 2500 Van.

I can only see and reach tje top bolt. the slider one.
I am wondering what I have to remove to get at the bottom bolt

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  • road_dog64 Jan 16, 2009

    I know how to remove alt. once I get to it.>>> Not much room on full size van, DDo I need to remove ....Grll rad and shroud etc. ,

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Disconnect and label the wiring harness connections to the alternator (Painters Masking tape works very well for labeling Automotive wiring).

Loosen the alternator pivot bolt.

Remove the bolt that attaches the alternator to the adjustment arm.

Rotate the alternator to loosen the drive belt and disengage the belt from the pulley. Be careful that any spacers that are used in mounting are kept with their original bolts. This will make correct reinstallation much easier.

While supporting the alternator remove the pivot bolt.
Remove the alternator from the vehicle.

To reinstall the alternator, reverse the removal procedure.

Posted on Jan 15, 2009

  • 1 more comment 
  • Chris Hall
    Chris Hall Jan 16, 2009

    You should not have to do all that. If you loosen (or remove) the bolt you can get to, you should be able to change the position of the alternator giving you access to the second bolt.

    Chilton rates this operation at .8 hours (remore and replace).



    I'm going to pull a few books around the shop and see if I can get some more detailed information regarding any tricks that might help.



  • Chris Hall
    Chris Hall Jan 16, 2009

    The below instructions are suppose to be specific for GM Full Size Vans 1967-1986.



    REMOVAL & INSTALLATION

    See Figures 1 and 2


    Fig. 1: View of the alternator mounting locations


    Fig. 2: Loosen the alternator pivot bolts to remove the drive belt


    1. Disconnect the battery ground cable to prevent diode damage.
    2. Disconnect and tag all wiring to the alternator.
    3. Remove the alternator brace bolt.
    4. Remove the drive belt.
    5. Support the alternator and remove the mounting bolts. Remove the alternator.
    6. Install the unit using the reverse procedure of removal. Adjust the belt to have 1/2 in. (12.7mm) depression under thumb pressure on its longest run.

  • Chris Hall
    Chris Hall Jan 16, 2009

    The below instructions are suppose to be specific for GM Full Size Vans 1967-1986.



    Removal and Installation

    See figures 1 and 2







    Fig. 1: View of the alternator mounting locations







    Fig. 2: Loosen the alternator pivot bolts to remove the drive belt






    1. Disconnect the battery ground cable to prevent diode damage.
    2. Disconnect and tag all wiring to the alternator.
    3. Remove the alternator brace bolt.
    4. Remove the drive belt.
    5. Support the alternator and remove the mounting bolts. Remove the alternator.
    6. Install the unit using the reverse procedure of removal. Adjust the belt to have 1/2 in. (12.7mm) depression under thumb pressure on its longest run.

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