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  • Anode Thread size???

    This might be a question hard to answer but I can't for the life of me figure out the right size for the anode bolt on the outdrive. I have an 89 7.5 l 460 King Cobra. I recently bought a new anode for the outdrive. However, the original anode was not there nor was the bolt to hold it in.

    It's part number 0332746 - L/P and to my luck its nowhere available online. I figured I could go and grab one at a hardware store but none of the threads match up. The 5/16 thread goes in about 1 full turn. I also tried metric (can't remember the size that fit best). What am I missing?

    Any thoughts? Check out the diagram to see which anode I'm talking about.

    Thanks Click image for larger version

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  • #2
    There are course (5/16-18 unc) and fine (5/16-24 unf) thread screws.

    5/16-18 is the most common
    5/16-24 is a “specialty” screw
    ....

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    • #3
      Originally posted by dingbat View Post
      There are course (5/16-18 unc) and fine (5/16-24 unf) thread screws.

      5/16-18 is the most common
      5/16-24 is a “specialty” screw
      Hey thanks for replying,

      I actually tried both. The 5/16-18 fit better, but only 1 rotation. The inner threads seem to be fine, no signs of previous cross threading

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      • #4
        You can try chasing the threads with a 5/16-18 tap. If that jams up you can drill it out and install a helicoil for 5/16-18. That's what I did when my mounting threads were corroded.
        Rich

        1995 Chris Craft 21 Concept (OMC 50FAPHUE)

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        • #5
          Originally posted by Horigan View Post
          You can try chasing the threads with a 5/16-18 tap. If that jams up you can drill it out and install a helicoil for 5/16-18. That's what I did when my mounting threads were corroded.
          Thanks Rich,

          I'll give that a shot

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          • #6
            Originally posted by Horigan View Post
            You can try chasing the threads with a 5/16-18 tap. If that jams up you can drill it out and install a helicoil for 5/16-18. That's what I did when my mounting threads were corroded.
            Figured I'd give an update. Used a 5/16-18 tap. Worked like a charm.

            Thanks

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            • #7
              Excellent!
              Rich

              1995 Chris Craft 21 Concept (OMC 50FAPHUE)

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              • #8
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                Great work!
                A good tip is coating the threads of all the fasteners on the drive with OMC gasket sealer, Merc Perfect Seal or Permatex Aviation. I have been doing this for years and have not had trouble with seized threads, even though my outdrive has been in salt water for 6 months out of the year most seasons.
                1988 Four Winns 200 Horizon
                4.3 OMC Cobra

                98 Jeep Grand Cherokee 4.0 Selectrac
                07 Jeep Grand Cherokee Limited 5.7 Quadradrive II

                "While air doesn't freeze....rust never sleeps"

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