Home Forum Ask A Member Johnson TN28 Carbon Seal Upgrade

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  • #254967
    Buccaneer
    Participant

      US Member

      I made the retainer I needed today, making the OD a .003 press / tap fit,
      so the top of the retainer was just below the bottom of the crankshaft.
      I put a little Loctite around it for good luck.

      The upgrade seems like a good thing, then again, I was pretty much
      clueless what I was doing.
      The one service bulletin upgrade diagram was to scale, so it was pretty
      easy to calculate the dimensions of the retainer, knowing that the driveshaft
      is 7/16″.

      I drilled the center hole through the retainer one drill size lager than the driveshaft,
      which is .016 larger.

      The powerhead is now reinstalled. The motor seems to turn over stiff with a
      box end wrench. I hope my center hole in the retainer was big enough.
      Theoretically, the power head bolts should align center the powerhead
      onto the lower unit perfectly centered.
      As per the bulleting the shift cable tube and water tube may need bent slightly
      for clearance, and they did.
      It feels more like the water pump impeller has excess friction. I hope
      I put the correct one in.
      If I get the flywheel on tomorrow, I’ll see how it feels pulling over via a rope.
      I don’t know if I have the gumption to pull it all apart again.

      The good news is that the neutral shift works after some cable adjustment.

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      Prepare to be boarded!

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