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Ooops. Water in the exhaust header (intentionally)

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    #1

    Ooops. Water in the exhaust header (intentionally)

    Ok - we'll get this out of the way first - I'm an idiot.

    Now on to the problem. Dumped the boat in the lake Saturday and it ran fine all day long, dump it in yesterday and it's over heating. Pull it out and park it in the driveway. I replaced the impeller, though I think it was fine (though not by the time I got it out), and started pulling hoses and flushing lines with a garden hose to check for flow. In an idiot moment I flushed back into the header, and not just a little - to the point where I could hear it filling up. And to continue the brainless moment I did the same thing to the other side! About 10 minutes later I had an Oh **** moment. Needless to say I've not started it.

    So the question.... what now? Pull the plugs and manually turn over the engine? Then change the oil a bunch of times? Or?

    I am assuming I just dumped all that water into the cylinders? Correct? So I've got a bunch of water sitting on top and as soon as I turn it over it'll dump in? Or maybe I'm making the wrong guess and someone will tell me all is wonderful in the world

    And how do I manually turn it over. I've got a 24v with the marine power 5.7. As with everything else I'm going to assume it to be a PITA.
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    #2
    Did you remove the 4" exhaust and put water down it? If so you are in trouble pull the plugs asap and get that water out. Then keep changing the oil and running it till the milk goes away!

    If you flushed water down the coolant hose that goes to the manifold you did no damage.

    Sent from my HTC 10 using Tapatalk

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      #3
      Also do not turn it over until the plugs are out... You will cause lots of damage....

      Sent from my HTC 10 using Tapatalk

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        #4
        Yup - the big pipe. When I go stupid I don't half *** it. Can I pull all the plugs at once? Or should I do 1 at a time? 1 side then the other?

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          #5
          Yes, you can AND MUST pull all of the spark plugs at the same time. Then if it was me, I'd manually turn the crank a few rotations (ratchet on the crankshaft) to get the bulk of the water out. Then I'd apply the starter to get even more out.

          ChrisSnow is 100% correct that you'll "cause lots of damage" if you leave the plugs in. Presumably you know that an engine works by compressing the fuel+air mixture in the cylinders prior to ignition. Fuel+air is a compressible medium; fluid (read: water) in the cylinders is NOT compressible. This means if you force the engine to crank, that pressure will go somewhere and start damaging expensive things. Instantly.

          You need to move quickly. Don't waste time. The rusting has already started. Get those plugs out and start using the pistons to evacuate the water. Manually, then with the starter, and then put the plugs back in and get the engine started to finish clearing the water. Then change the oil, run the engine, change the oil again, and keep this up until the oil coming out looks as clean as the oil going in.

          Report back!

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            #6
            This is making me really nervous as we just bought a boat and it over heated in the fist 15 min and we didn't pull the plugs for 2 days.. Also the guy who is working on it did turn it over after putting plugs back in it. The water pump impeller went out and likely trashed the head gaskets.

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              #7
              Overheating isn't the same as filling the cylinders with water. Your engine may survive overheating. It won't survive being filled with water and then being cranked.

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                #8
                There was water in the cylinder, pulled plugs and water came out. Likely head gasket failed at the same time..

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                  #9
                  Pulled plugs, hand cranked engine until no more water came out, spun the starter a few times, plugs back in, ran for 10 min or so. Now to swap the oil a few times. Thanks for the instructions. I'm sure this cluster also probably magically fixed my overheating issue/non issue as well.

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                    #10
                    Originally posted by IDBoating View Post
                    Yes, you can AND MUST pull all of the spark plugs at the same time. Then if it was me, I'd manually turn the crank a few rotations (ratchet on the crankshaft) to get the bulk of the water out. Then I'd apply the starter to get even more out.

                    ChrisSnow is 100% correct that you'll "cause lots of damage" if you leave the plugs in. Presumably you know that an engine works by compressing the fuel+air mixture in the cylinders prior to ignition. Fuel+air is a compressible medium; fluid (read: water) in the cylinders is NOT compressible. This means if you force the engine to crank, that pressure will go somewhere and start damaging expensive things. Instantly.

                    You need to move quickly. Don't waste time. The rusting has already started. Get those plugs out and start using the pistons to evacuate the water. Manually, then with the starter, and then put the plugs back in and get the engine started to finish clearing the water. Then change the oil, run the engine, change the oil again, and keep this up until the oil coming out looks as clean as the oil going in.

                    Report back!
                    Ya - I know water won't compress very well so I at least stopped the idiocy before I got to that point. Thanks for the instructions.

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