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Thread: Alternator pulley size

  1. #1
    Join Date
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    Alternator pulley size

    Just bought a replacement alternator for my D1 3.9 1994 build date
    The replacement has a smaller pulley and the tensioner cannot apply adequate tension to the serpentine belt to avoid slipping when the air conditioner is running
    Im considering swapping the pulley with the original alternator.

    Question 1
    Is their a trick to undoing the pulley nut.
    Question 2
    Is the pulley nut right or left to undo

    PS
    The alternator failed after performing a jump start of another car and the tacho stopped working
    After replacing the alternator the tacho still does not work
    Any thoughts on the tach o issue

    Thanks in advance
    Stewie

  2. #2
    Join Date
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    Quote Originally Posted by right View Post
    The alternator failed after performing a jump start of another car and the tacho stopped working
    After replacing the alternator the tacho still does not work
    Any thoughts on the tach o issue
    Stewie
    Your vehicle takes its tachometer signal from the alternator, not the coil. Look for a white wire with a slate tracer. If it is properly attached, make sure it is tight and not loose. If lose, tighten the connector by squeezing it a bit with a pair of needle nose.

  3. #3
    Join Date
    Jan 1970
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    A way to undo the alternator nut is to get an old belt, wrap it around the pulley, place the belt tightly in a Vice so that the pulley cannot move by holding the alternator tightly above the vice and pulling the belt tight with the vice partially closed , fully close the vice and undo the nut.
    It may vary but I have found most to be conventional thread direction.
    Regards PhilipA

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