6 cylinder inline Mercs

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  • September 8, 2026 at 5:28 pm #328044
    silver42
    Participant

      What 6 cylinder inline Mercurys from the 1950’s used a 7/8” diameter driveshaft? I’m trying to mate an early Speedmaster lower unit with a 7/8” driveshaft to an appropriate 6 cylinder inline Merc.  The Mark 75 shaft is too small as is the Merc 700 direct reverse model. I believe the Merc 700 full gearshift model has a 7/8” driveshaft but need this confirmed.

      Thanks,

      Frank McCarthy

      September 9, 2026 at 9:34 am #328075
      Tubs
      Participant

        Try contacting Joe Poole at – http://www.fergusonpoolemarine.com/

        A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.

        September 13, 2026 at 8:01 pm #328391
        mercguy
        Participant

          Lifetime Member

          The 1960 800 direct reversing motor would be the first.  The 700 gearshift has it as well.

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