Mercury inline 6 compression

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  • May 5, 2018 at 5:13 pm #9836
    bsplit
    Participant

      I just dug out an inline six that I’ve had in storage for several years. I think it’s between 85 and 115 horsepower….probably 1980’s vintage. I tested the compression and it reads: 155, 168, 160, 160, 165, 160. I never knew that the compression was that high on those motors. Is that normal? It is a short block. I removed the inspection covers, and the pistons look like new. Anyway, I’ll probably be selling it somewhere down the line.

      Any comments will be appreciated.

      Thanks,
      Jim

      May 5, 2018 at 5:19 pm #75399
      jeff-register
      Participant

        US Member - 2 Years

        Jim,
        Very good comp & normal, Look on the very top cylinder for I.D. numbers.
        Jeff

        May 5, 2018 at 5:22 pm #75400
        bsplit
        Participant

          Thanks, Jeff…..how have you been. I sold you a motor a few years ago….I think it was a Firestone or Scott.

          May 5, 2018 at 5:28 pm #75401
          bsplit
          Participant

            I just checked the numbers on the top cylinder. It looks like 852 7738

            May 5, 2018 at 5:34 pm #75402
            bsplit
            Participant

              Someone onEbay is asking $1300 for a short block with the same casting numbers on the top cylinder

              Jim

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