Hardened Oil Pump Drive Shaft

Small Block Mopar Engine

  1. blewbyoutobad

    blewbyoutobad Well-Known Member

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    I have a couple of used oil pump shafts. Is there a way to tell if they have the hardened shaft?
    Thanks FABO
     
  2. RustyRatRod

    RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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    Yes. Where it necks down to the hex that drives the oil pump. If it's a sharp 90* edge there, it's not hardened. If it smoothly transitions into the hex, it is. That's done to relieve that area of any sharp changes in shape to reduce the possibility of fracturing.
     
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    • gzig5

      gzig5 FABO Gold Member FABO Gold Member

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      Running a good file over the area should give you a good idea if it has been hardened or not. If it is hard, the file won't cut.
       
    • brian6pac

      brian6pac Well-Known Member

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      Top picture non hardened SB, Bottom picture hardened but BB

      non hardened.jpg

      hardened shaft.JPG
       
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      • blewbyoutobad

        blewbyoutobad Well-Known Member

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        Thanks guys, I have two in good shape but they are not hardened so probably not worth selling?
         
      • RustyRatRod

        RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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        Free to advertise them. If somebody needs one and they're not running a high volume oil pump, then they might want it.
         
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        • AJ/FormS

          AJ/FormS 68 B'cuda fb, Form S clone ... 367/A833/3.55s

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          If the edges are still sharp, then they are re-useable. Whether or not somebody will trust their engine to one is another matter.
           
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          • diymirage

            diymirage HP@idle > hondaHP@redline

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            They make great primers as well, a quick cut and a weld and done

            People may even want them for that
             
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            • 4spdragtop

              4spdragtop CONGRATS NORTH AMERICA!

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              Yep good for priming engines like DIY said.
               
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              • famous bob

                famous bob mopar misfit

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                U can cut the teeth off of the gear and use an old big screw driver blade in a drill even.
                 
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                • MOPAROFFICIAL

                  MOPAROFFICIAL Well-Known Member

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                  Yep, tapers w/dark blue 'from hardening' end. I've heard guys saying they lathed the lip on stockers and torched them..
                  I tell'em no thanks I'll spend the 55.00
                   
                • blewbyoutobad

                  blewbyoutobad Well-Known Member

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                  Yes they are good as primers. I have one with the teeth cut off. Anyone wants one $10.
                   
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                  • perfacar

                    perfacar Well-Known Member

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                    also, the hardened shafts have a roll pin holding the gear on, others do not! like you said, the transition is tapered on hard shafts.
                     
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