TN 27 or TN 28 power head rebuilt

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  • November 14, 2020 at 10:09 pm #220865
    genetoo
    Participant

      There were many of these manufactured & still many still out there but it seems none with good compression ,still good runners . (It must run& start easy).Now I,m told there are no rings available for this outboard anymore ? I want one of these for nostalgic reasons. Is there a member out there that is capable, if I was to send you a power head to rebuild it, or has one that they would do for us ? Will pay all the shipping,cost of the rings & your labor. Already have all the other good components, just need the powerhead new rings ,hone the cyls done etc eugeneschreiber@frontier.com

      November 15, 2020 at 2:57 pm #220898
      lloyd
      Participant

        US Member

        Most of them still have good compression because they ran on 16:1 fuel oil mix and the primer seals went bad before the cylinders and rings wore out. What compression does your motor have? If it has 70-75 PSI it will start run and idle AOK. Best I ever measured on one was 77 PSI. I have some new old stock rings but never needed to use them. I don’t want to rebuild a powerhead, but I have the rings if you need them.

        November 17, 2020 at 7:51 pm #221091
        genetoo
        Participant

          Lloyd
          Both TN 28 that I have were below 60 lb on both cyl. This is a outboard that I definitely want to be a good runner ,will be used by the Wife & I,also by the Grand kids. I have dug into the power head,waiting on rings and already have technical questions. Power heads have never been my expertise.The cylinders,crankshaft,wrist pins are all very good,but assembly is a issue right now. Geneee

          November 17, 2020 at 11:18 pm #221103
          lloyd
          Participant

            US Member

            Not just one but TWO TN’s with BELOW 60 PSI on BOTH cylinders???? I can honestly say that I have never seen any TN with less than 65-67 PSI. But you have two with less than 60PSI on BOTH cylinders??? I strongly suspect that your compression checks were inaccurate. Compression gauge wrong? Incorrect procedure to check compression? Rings stuck from sitting too long? I am a slow typist. Give me a call and maybe I can help you out. 231-929-7479

            November 18, 2020 at 4:10 am #221118
            Mumbles
            Participant

              TD-TN motors use the same rings as later 5.5 and 6 horse motors. Current P/N 378432 for two rings.

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