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1977 Mako 20 rebuild

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  • 1977 Mako 20 rebuild

    Just picked up this 1977 Mako 20 a couple weeks ago and I've already started the rebuild. Thanks to alot of research on this site I feel ready to take it on. My plan is to repower with a Mercury 150 that I already have, replace fuel tank, repair holes a d cracks in fiberglass and paint, and hopefully get it back on the water within a year. So any advice is much appreciated!

  • #2
    Congrats on the boat! That’s a great model for inshore and near-shore, even a little off-shore if you keep an eye on the weather.

    Lots of good advice and experience is available on this site.

    I’m subscribed and look forward to watching the progress.
    M20 project-Finally Splashed!
    https://forum.classicmako.com/forum/...r-bottom-paint
    Gallery
    https://forum.classicmako.com/member...kgfisher/media


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    • #3
      I actually studied your rebuild alot! How much was your fuel tank? Did you get it from sunshine tanks?

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      • #4
        42 gallons, and yes it came from Sunshine Marine Tanks.
        M20 project-Finally Splashed!
        https://forum.classicmako.com/forum/...r-bottom-paint
        Gallery
        https://forum.classicmako.com/member...kgfisher/media


        Comment


        • #5
          Had a little free time so I started hacking away at the foam. This tank is really in there! Definitely some saturated foam with water and fuel.

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          • #6
            Finally worked the tank out of the coffin. It really doesn't look too bad, some pitting but no leaks. The foam definitely has fuel in it though so It must have been leaking from somewhere. I also talked to sunshine tanks today and Lucy was great but it ended up that shipping was going to kill the budget so she directed me to Florida marine tanks. They also have the drawings for the original aluminum tank and came in about the same price as sunshine and I can just pick it up.

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            • #7
              Worked out the fuel fill and vent lines today. Ended up cutting a hole in the step to cut the bend in the aluminum lines, might put speakers there. Ran the motor on friday,for the first time since purchasing, she fired right up. I feel like it was a really successful week! Should be getting the resin and fiberglass next week so I can start filling holes and cracks, and prepping for paint.

              Any suggestions on paint... thinking about either total boat top coat or interlux brightside.
              Attached Files

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              • #8
                Looking good.
                M20 project-Finally Splashed!
                https://forum.classicmako.com/forum/...r-bottom-paint
                Gallery
                https://forum.classicmako.com/member...kgfisher/media


                Comment


                • #9
                  Been sanding and grinding...and sanding and grinding. Really started picking the scab but It was worth it. About 80% of cracks and holes have been filled, waiting on some marine plywood so I can fill some of the bigger holes and rebuild the coffin lid.
                  Attached Files

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                  • #10
                    Keep plugging away.
                    M20 project-Finally Splashed!
                    https://forum.classicmako.com/forum/...r-bottom-paint
                    Gallery
                    https://forum.classicmako.com/member...kgfisher/media


                    Comment


                    • #11
                      Had some free time to work on the mako. Ended up replacing part of the wood core on the gunwales, super rotten from the outrigger mount and other holes. Got alot of cracks and holes filled, still need to decide if I'm going glass in the transom thru hulls. Should get my fuel tank in within a couple weeks so that's exciting! Also polished up all the marinium parts with some mothers polish and they turned out really nice!

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                      • #12

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                        • #13
                          I actually used an off brand HDPE marine board from Interstate Plastics.
                          Where are you located? I think they have a few locations scattered around.
                          M20 project-Finally Splashed!
                          https://forum.classicmako.com/forum/...r-bottom-paint
                          Gallery
                          https://forum.classicmako.com/member...kgfisher/media


                          Comment


                          • #14
                            I'm in Aiken, SC. Yeah any help would be great!

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                            • #15
                              Found one soft spot in the deck that actually needed attention so I decided to grind it out and repair with glass. Its crazy how the old poly resin bubbles up. While that was curing I decided to attack the console that needed a face lift.

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