Restoration of 1964 Johnson JH 19A

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  • August 28, 2021 at 3:03 am #245607
    Monte NZ
    Participant

      International Member - 2 Years

      Hi All. Your help and advice again please.
      Attached are photos of the block and cylinder head that I have lapped.
      Going on the photos, do I need to do any more lapping?……..the bungs in the block are to keep the grindings from going down the bore.
      NOTE The welding repair on the water jacket………head bolt hole to be rebored

      Thanks very much in advance for any help.

      Monte NZ

      Block

      Block

      Cylinder head

      Cylinder head

      August 28, 2021 at 9:59 am #245614
      RICK EICHRODT
      Participant

        US Member - 2 Years

        Monte,
        I am no expert but the reason one laps the gasket mating surfaces is to take any warpage out of the block and head. From your pictures, you have lapping marks all over the gasket area which is what you want, I believe. I would not worry about the tiny marks that I see. The more you lap and take away material, the more you raise up compression. It looks good to me!

        Rick

        August 28, 2021 at 5:00 pm #245640
        fleetwin
        Participant

          US Member - 2 Years

          Like Rick says….

          August 29, 2021 at 2:09 am #245670
          Monte NZ
          Participant

            International Member - 2 Years

            Thanks Rick and fleetwin for your replies…….much appreciated.
            I didn’t think there was any need to go any further, but I was concerned mainly with the block having a lot of corrosion.

            Thanks again
            Monte NZ

            September 5, 2021 at 6:42 am #246143
            Monte NZ
            Participant

              International Member - 2 Years

              Hi Rick and Fleetwin and others………thought you would be interested in a progress report on the motor since my last post re lapping.
              I have bored out two stripped threads in the block and installed helicoils………my first experience with helicoils!
              The job went well. I then replaced the head using a new gasket, torqued the bolts to 70 inch lbs, fitted the flywheel and tested the compression (three times) which gave readings of 73lbs on one cylinder and 76 lbs on the other. Needless to say that I am very pleased with the results.

              Thanks again for your help.
              Monte NZ

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