Brake Drum Wear Limit

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  • 30th October 2023 at 2:17 pm #34115
    Nigel Watling
    Participant

      Does anyone know what the max dimension the front brake drum can be skimmed out too please on a 1951 Light 15.

       

      Nigel

      1st November 2023 at 8:01 pm #34485
      Bernie
      Participant

        The manual, operation 120.17, states …

        Do not increase by more than 2 mm. the original drum dia. which is 255mm. (10 inch drums) or 305mm. (12 inch drums).

        B….

        1st November 2023 at 8:17 pm #34487
        Bernie
        Participant

          Oops …

          Correction to above – it is workshop manual operation 120.16c.

          B…..

          2nd November 2023 at 8:19 pm #34791
          Nigel Watling
          Participant

            Thanks Bernie, I missed this first time looking in the manual, just awaiting delivery of internal micrometer from fleabay to now check.

             

            Nigel

            14th December 2023 at 2:56 pm #35947
            Chris
            Participant

              Following on, I would think that the dimension that matters is the remaining thickness. I wonder what thickness 255 or 305mm equates to.

              I suspect more of us have a 25mm external micrometer than have a 250mm internal one.

              14th December 2023 at 3:43 pm #35949
              Bernie
              Participant

                For those without access to a large internal mic, the solution is to adjust a pair of ordinary internal callipers to the id of the drum and then measure that setting with a suitable external measuring device.

                However, as any necessary rectification will almost certainly entail seeking the sevices of an engineering workshop with appropriate measuring facilities, I would simply take the drum(s) there to be checked in the first place.

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