TFL Caldwell breaks prop shafts

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  • Doctorplumb
    Junior Member
    • Oct 2023
    • 8

    #1

    TFL Caldwell breaks prop shafts

    I purchased a brand new TFL Caldwell will Not even run a full pack without breaking the prop shaft every time(3), i’ve tried new bearings.
  • 1coopgt
    Senior Member
    • Feb 2019
    • 417

    #2
    I'm guessing you have the washer and drive dog jammed up against the drive(not sure what its called) There should be a space between the washer and the drive at a minimum the thickness of the flex shaft. They shrink as you get on the power. Make sure the flex is greased well also.

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    • KnotFast
      Junior Member
      • Nov 2025
      • 27

      #3
      Are you referring to the TFL caudwell F1 tunnel hull boat with the outdrive? I have the scale outboard version and the gears will not hold so I replaced the scale outboard with a TFL CNC aluminum outboard leg. Running on 4s with a 42mm 1.6p prop.

      as 1coopgt stated above be sure the drive dog isn’t butt up against the washer. Also yes be sure to have plenty of grease. Here’s a video of my caudwell. Oh the struggles.

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