1957 Mercury Mark 10

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  • August 22, 2025 at 10:13 am #299174
    Aidan Smith
    Participant

      US Junior Member

      Hello!

      I have accepted a new challenge, a Mark 10. As someone who has only worked on OMC motors, I understand that this era of Mercs is a more difficult breed to work on.

      While it has great spark, I do know that it needs to have the impeller replaced. Would anyone be able to point me in the direction of where I need to start? Where would I be able to locate a service manual, and the correct tools?

       

      Thanks,

      Aidan

      "Shells sink, dreams float. Life's good on our boat."
      1921 Elto Light Twin
      1923 Evinrude Model N Sportwin
      1930 Johnson F-50
      1956 Johnson JW-12R
      1956 Johnson CD-13A

      August 22, 2025 at 2:58 pm #299184
      seakaye12
      Participant

        US MEMBER PAY BY CHECK

        Hi Aidan,

        I can share several PDF Mercury Manuals if you want to PM me your e-mail address.

        They are very large files;  large enough to require use of a file transfer service for me to send them to you  (They are loo large to go through most e-mail systems.)

        File transfer services are free.  I use WETRANSFER.

        Working on Automatic transmission Mercurys is easier than many people make it out  to be….yet way harder than other people make it out to be.  It would be great if:

        1. Your motor is not a salt water motor.
        2. You have someone locally to you that has done it before and can be there with you on the first attempt.
        3. You have access to the special tools that Mercury supplied for these repairs…..or are able to make your own tools.
        1 user thanked author for this post.
        Aidan Smith
        August 22, 2025 at 3:53 pm #299185
        Aidan Smith
        Participant

          US Junior Member

          Seakaye,

          Thank you for being willing to share your resources. I have some connections with more Mercury-based people who may be able to give me a hand. From what I can tell, this motor has not been a saltwater motor, as there are no visible signs of corrosion on the powerhead, or body at all. Just typical paint fading and wearing. I don’t have any tools, but if I can make them, I certainly will.

          Aidan

          "Shells sink, dreams float. Life's good on our boat."
          1921 Elto Light Twin
          1923 Evinrude Model N Sportwin
          1930 Johnson F-50
          1956 Johnson JW-12R
          1956 Johnson CD-13A

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