Several question on power head build

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  • November 25, 2020 at 8:32 pm #221605
    genetoo
    Participant

      I know it varies from make & model of each outboard on torque specs for cyl heads ; In my case a TN 27 5 hp Johnson. Does someone have that number handy ? Is it measured in ft lbs and yes there are torque specs in ( inch lbs)

      Also when honing the cyls what should one be using for a lubricant while honing

      When completely rebuilding a power head what is a good assembly lube ? Thx Much !!

      Gene in Farmington, Mn

      November 25, 2020 at 9:32 pm #221606
      bobw
      Participant

        US Member

        Here’s a chart that covers the bolt torque values. Your TN cylinder heads would be 5 to 7 ft-lbs. or 60 to 84 in-lbs. Use an in-lb torque wrench for the best result.

        I use 2-stroke oil when honing cylinders and Lubriplate 105 assembly lube during assembly of the connecting rods. Cylinders should be well coated with 2-stroke oil when installing the pistons.

        Torque-Chart-OMC-copy

        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."

        • This reply was modified 3 years, 5 months ago by bobw.
        • This reply was modified 3 years, 5 months ago by bobw.
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