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Rust Problem, Maybe?

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  • Rust Problem, Maybe?

    My 1979 Seaswirl (OMC 120 HP with Stringer 400) is still overheating. I was wondering if it is even possible that rust could be clogging the manifold. I pulled one of the drain plugs today and brown water came out. Has anyone heard of something like this?

  • #2
    Ayuh,.... Welcome Aboard,..... Anything is possible,....

    Pull the riser off the manifold, 'n have a look,....

    The water has to get In, so a new impeller is important,...
    'n water has to be able to get out, so ya, check the riser connections,...

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    • #3
      did you replace the raw water pump? on a stringer, I normally replace the whole pump assembly
      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 - http://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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      • #4
        I replaced the impeller last year. It pumps water but still overheats. Even after I pulled the thermostat.

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        • #5
          pulling the thermostat actually makes it worse because the water is moving too fast. without a thermostat, you need a restrictor plate.

          with the boat in the water (on the trailer). disconnect the line from your transom and put in a 5-gallon bucket. you should fill the 5 gallon bucket in about 15 seconds. if you do, you have good flow to your motor. if not, look at your drive/intermediate, etc. for a restriction

          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 - http://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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          • #6
            I just pulled the riser. There's a lot of sediment.

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            • #7
              I pulled the riser and there's a lot of sediment. Flush ?

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              • #8
                Sure, whatever it takes,....

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                • #9
                  Appreciate the input. Not a lot of local advice. The manifold was packed also so I'm getting some descaler and running it thru the block. I'll let you know what happens.

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                  • #10
                    If you knock out the core plugs and remove the water pump you will be able to get a lot of the slag that is in the block by using a pressure washer or even a garden hose.
                    Kenner, Louisiana 1980 Donzi 18'. 2+3 6.2 MPI Alpha 1

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                    • #11
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                      Normally raw water cooled manifolds and risers have to be replaced in salt water every 5-7 years, but even in fresh water you can get corrosion that clogs up the water passages if the water is corrosive enough. Flushing out the block with the water pump removed it a good idea, if you don't remove the core plugs at least open the engine block drains.
                      1988 Four Winns 200 Horizon
                      4.3 OMC Cobra

                      98 Jeep Grand Cherokee 4.0 Selectrac
                      07 Jeep Grand Cherokee Limited 5.7 Quadradrive II

                      "While air doesn't freeze....rust never sleeps"

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