Johnson Flywheel with a stripped puller hole

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  • July 5, 2018 at 12:14 pm #79061
    Buccaneer
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      US Member

      That makes more sense to have the puller holes in a steel hub!
      One stripped aluminum bolt hole is enough. I was kind of surprised
      that my heli-coil held up. When I first heard that big "bang" when
      the flywheel released, I just hoped it wasn’t something catastrophic!

      quote FrankR:

      [quote=
      OMC made a change in their Big Twin flywheels around 1958-ish. The revised hub has a flange that the puller screws into. The one in the picture is the old style where the flywheel could be pulled off of the hub. Worse, they often broke loose.

      Prepare to be boarded!

      July 6, 2018 at 4:05 pm #79119
      outbdnut2
      Participant

        US Member
        quote NJ-boatbuilder57:

        There’s always the other option of using a wide-stance puller that can clamp the outside of the flywheel.

        I tried this on an RD 35 HP Johnson once after breaking a bolt off in a puller hole (I don’t think I had hard enough bolts). I then used an automotive brake drum puller and cracked the flywheel – I quit pulling when I saw the cracking start. I now have the OMC puller and it works great.
        Dave

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