1956 Johnson 7.5(AD-10) Cylinder Head torque sequence

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  • August 24, 2018 at 9:16 pm #10963
    silvab7232
    Participant

      I was wondering the correct way to torque the 1956 Johnson 7.5 hp Cylinder Head?

      August 24, 2018 at 10:02 pm #81724
      bobw
      Participant

        US Member

        Here’s a diagram that shows typical torque sequence and a torque specification chart for a number of OMC motors. When torquing the head bolts, go 1/2 torque value on the first pass, then 3/4 value on a 2nd pass and full torque on the 3rd pass.

        Attachments:

        Bob

        1937 Champion D2C Deluxe Lite Twin
        1954 Johnson CD-11
        1957 Evinrude Fastwin 18
        1958 Johnson QD-19
        1958 Johnson FD-12
        1959 Johnson QD-20

        “Every 20 minute job is only a broken bolt away from a 3-day project.”
        "Every time you remove a broken or seized bolt an angel gets his wings."

        August 25, 2018 at 6:25 am #81743
        dietzer
        Participant

          Great info. Have the same motor. Thanks

          August 25, 2018 at 12:59 pm #81753
          cajuncook1
          Participant

            The above information is correct, but there is one thing to add. Once the motor has been run for a bit and the engine has been allowed to get to operating tempture, turn it off and let it cool. Then go back and re-torque one it one last time per manufacture specification. This will insure adequate sealing after the metal and gasket material have been heated and then cooled.

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