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Crankshaft alignment ("run-out")

Discussion in 'Early CJ5 and CJ6 Tech' started by Stout, Sep 29, 2012.

  1. Sep 29, 2012
    Stout

    Stout Member

    Quakertown, PA
    Joined:
    Nov 1, 2010
    Messages:
    958
    Section E-40 of the FSM explains how to check the "crankshaft alignment." I followed the directions but I'm not exactly sure what it is proving or disproving. I started with the center journal as explained and put a dial indicator on it, spun the crank and noticed that the needle moved .001". I then did the front and then the back as explained. They both moved .002". The FSM says the "maximum allowable run-out is .002". But what does this mean? Does it mean I'm in spec or did I misunderstand the instructions? I'm not concerned about it, I'm merely curious.

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    Stout, Sep 29, 2012
    #1
  2. Sep 30, 2012
    Jeepenstein

    Jeepenstein Me like Jeep.. 2024 Sponsor

    North Central FL
    Joined:
    Jun 15, 2003
    Messages:
    2,156
    You are basically checking to see if the centerline of your crank journals are straight, they all run on the same centerline.. Also if the journals are round as a byproduct, but the intent is looking for a bent crank.. And yeah, at .002, you are fine..

    Bubba
     
    Jeepenstein, Sep 30, 2012
    #2
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