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Replacing freeze plugs

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  • Replacing freeze plugs

    I have an 89 model OMC 5.0L that is missing two freeze plugs. I replaced one with the expandable rubber seal type, but the other one is behind the motor mount and the gap is too small to get the freeze plug into. I figure I am going to have to pull the motor to get to it unless someone on here has a better suggestion.
    East Texas newbie jumping into the deep end...

    1989 OMC Sterndrive Model 502BPRMED

  • #2
    Any idea why these freeze plugs are not in there now ?------Best to check this engine out carefully before launching.

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    • #3
      I do not know. Boat sat at least 10 years without being run before I bought it. I got the engine running yesterday and it purrs like a kitten, starts right up no issues at all. I stuffed a rag in the hole to stem the flow of water a little bit just to see if it would run. Now that I know it runs I would like to address the freeze plug issue.
      East Texas newbie jumping into the deep end...

      1989 OMC Sterndrive Model 502BPRMED

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      • #4

        they are not "freeze" plugs, they are core plugs to get the core sand out of the casting at the foundry.

        GM 5.0 or Ford 5.0?

        if its a GM 5.0 and the core plugs are pushed out, most likely the block is cracked

        if its a Ford 5.0 and the core plugs are pushed out, 50/50% chance the block survived

        core plugs should not come out
        Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

        1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

        Past Boats
        1970 Wooster Hellion - Merc 9.8
        2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
        1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

        What’s behind you doesn’t matter.Enzo Ferrari

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        • #5
          You might have some luck by un bolting the lag screws and with a small bottle jack you will be able to lift the engine just enough to remove the mount from the side of the engine and install the rubber plug.
          Just like Scott said the Ford engines are a lot stronger because they are cast from Nodular iron. I have never seen a GM engine push out a core plug without being cracked.
          Kenner, Louisiana 1980 Donzi 18'. 2+3 6.2 MPI Alpha 1

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          • #6
            also, the only reason core plugs come out of a boat motor is from lack of winterization.
            Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

            1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

            Past Boats
            1970 Wooster Hellion - Merc 9.8
            2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
            1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

            What’s behind you doesn’t matter.Enzo Ferrari

            Comment


            • #7
              Originally posted by kenny nunez View Post
              You might have some luck by un bolting the lag screws and with a small bottle jack you will be able to lift the engine just enough to remove the mount from the side of the engine and install the rubber plug.
              Just like Scott said the Ford engines are a lot stronger because they are cast from Nodular iron. I have never seen a GM engine push out a core plug without being cracked.
              I didn't use a bottle jack, but I did accomplish the task as you described with a large tow strap. It is a Ford 5.0 and the block seems to have survived. I have had it running and no water in the oil. I took the boat to the lake for a little test run and the engine was popping and backfiring when I put a load on it so I have some work to do there. I just toodled around near the dock for 5 minutes and put it back on the trailer. No water in the boat and nothing blew up, I am considering it a win! But I still have a ways to go before she is truly resurrected.
              East Texas newbie jumping into the deep end...

              1989 OMC Sterndrive Model 502BPRMED

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              • #8
                Sign up today
                consider yourself lucky on the motor.

                now lets hope you are that lucky with wet foam. late 80's vintage OMC branded boats (yes OMC owned many boat companies) are not known to last this long without issues
                Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

                1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

                Past Boats
                1970 Wooster Hellion - Merc 9.8
                2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
                1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

                What’s behind you doesn’t matter.Enzo Ferrari

                Comment

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