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Did i burn my motor? Water in my oil / no comperssion in one cylinder

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  • Did i burn my motor? Water in my oil / no comperssion in one cylinder

    Hello I have a 1984 Formula 23SC with an I/O Mercruiser 228 5.0L V8. The boat was running fine until I notice oil/water mix coming from my bilge pump. At this point I knew I had and oil leak somewhere. I begin to monitor my oil more often and adding a quart every month or so (I use my boat 4 times a week). Now this is the big problem: The leak got worst, while I was in the water the bilge pump just would not stop pumping that milky stuff (water/oil mixture). I soon turn the boat on and head back to my marina. In my way back the engine felt jumpy and rough to the point that it just stalled and die. I then was able to turn the boat back on but at this point the engine begin to make a real bad clanking noise, I know at this point that I had no oil. I check the dipstick and it was completely dry plus it had water marks on it. I then pour a gallon of oil and still have no reading plus a lot more water marks on the dipstick. The oil leak is not that intense to leak a gallon in less than 5 minutes. I believe I have water in my oil and the mixture of oil/water in the pan does not allow me to get a reading on the dipstick. Is that possible? Long story I got a tow back to the marina. I did a compression test on each cylinder, see the results below:

    Cylinder # 1 = 120 lbs
    Cylinder # 2 = 125 lbs
    Cylinder # 3 = 120 lbs
    Cylinder # 4 = 120 lbs
    Cylinder # 5 = 120 lbs
    Cylinder # 6 = 20 lbs (problem cylinder)
    Cylinder # 7 = 110 lbs
    Cylinder # 8 = 110 lbs

    Also when I remove the spark plug from cylinder # 6 the plug was smashed (like something hit it) what do you guys think is the problem? The engine turns on but with a clanking noise plus there is water in the oil. Please I need your help!!! What should I do first? I need a good affordable mechanic in the New Haven CT area.

    Thank you!!!!

  • #2
    Re: Did i burn my motor? Water in my oil / no comperssion in one cylinder

    to iboats

    Really don't like the idea of knowingly having oil pumped into the water but I'll leave that alone.

    Sounds like you blew a hole in a piston and may have a cracked cylinder wall of head. Time to pull the engine and see if it is rebuildable.
    94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
    95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
    07 Seadoo GTX
    Merc Adults Only VP Adults Only
    G-Dad always said "First Liar doesn't stand a chance"

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    • #3
      Re: Did i burn my motor? Water in my oil / no comperssion in one cylinder

      Yuup ^^^^^^^
      The low compression and the smashed spark plug is not a good sign.

      I wouldn't even bother taking it apart in the boat.....Time to pull the motor!
      1986 21' Celebrity BR - 350 Mercrusier I/O 260 H.P....Engine Serial #B427596
      1981 18' Checkmate Eluder - Original 898 I/O engine....Replacement engine 1979-350....Serial#-Unknown
      Current..... Completed Restoration....Now on the water!
      1999 GTX Sea-Doo

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      • #4
        Re: Did i burn my motor? Water in my oil / no comperssion in one cylinder

        You can pull the intake manifold & heads to see what's going on, but it sounds like you'll need a new block.

        Where is the oil coming from? It sounds like a valve fell into the #6 cylinder and caused mayhem. Must have crushed your plug and punched a hole or crack in the block. Pop off the valve cover to see if all of your valve rods on #6 are still there & intact.

        Some pics would be interesting to see ... especially of the plug

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        • #5
          Re: Did i burn my motor? Water in my oil / no comperssion in one cylinder

          Wow I don't even know if is worth to fixed, I only pay 3k for the boat, a whole new block and or head sounds like a lot of money, plus I have to pay for labor since I am not a mechanic. I only had the boat for 6 months. Do you guys think is worth doing all those repairs in a boat that age? 1984 Any advice where to get a block or head at a good reasonable price? more advise will be appreciate!!

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          • #6
            Re: Did i burn my motor? Water in my oil / no comperssion in one cylinder

            Seems to me that if you paid only $3k for the boat and going to be needing to pay someone to do the labor, with the age of that boat I would probably not want to spend any more and try and part it out and move on.

            Mark
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            • #7
              Re: Did i burn my motor? Water in my oil / no comperssion in one cylinder

              I would use this as a good opportunity to swap in a 350 v8. The amount of time you ran your engine with water/milk/whatever has wasted the bottom end. Even if you were to get compression back up you are going to spin a bearing or throw a rod unless you repair the entire bottom end. The crank will probably be wiped and bearings gone. A 5.0 in that boat is under powered, swap in a 5.7 and learn a good lesson.

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              • #8
                Re: Did i burn my motor? Water in my oil / no comperssion in one cylinder

                A reliable source of good reman'd long blocks is Rapido Marine in FL. Take a look at what they have, your era Long Block will run about $1,550 for a 5.7L

                Engines motors Long Block mercruiser OMC Volvo Penta Crusader (NO CORE CHARGE)
                Last edited by LiquidC; August 28th, 2013, 10:54 AM.

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                • #9
                  Re: Did i burn my motor? Water in my oil / no comperssion in one cylinder

                  That's really a personal question........It's your boat and you have to make the decision. Is the boat worth it to you?

                  Seeen how your not a mechanic and have to have a Boat mechanic do the work...its gona be pricey, But you could go with a used truck motor and swap over the needed marine safety parts over to the new motor.

                  You do all the leg work and drop everything off to him...Get a quote first.

                  Im in the process of restoring an 1981 boat... Spending $1000 of dollers on a 81 boat.....but i like the lines and make of the boat and its worth it to me!

                  Hope that helps and Good Luck!
                  1986 21' Celebrity BR - 350 Mercrusier I/O 260 H.P....Engine Serial #B427596
                  1981 18' Checkmate Eluder - Original 898 I/O engine....Replacement engine 1979-350....Serial#-Unknown
                  Current..... Completed Restoration....Now on the water!
                  1999 GTX Sea-Doo

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                  • #10
                    Re: Did i burn my motor? Water in my oil / no comperssion in one cylinder

                    Originally posted by gonzalez3346 View Post
                    Wow I don't even know if is worth to fixed, I only pay 3k for the boat, a whole new block and or head sounds like a lot of money, plus I have to pay for labor since I am not a mechanic. I only had the boat for 6 months. Do you guys think is worth doing all those repairs in a boat that age? 1984 Any advice where to get a block or head at a good reasonable price? more advise will be appreciate!!
                    Ayuh,.... Maybe take up Golf or something,.....

                    I can't believe the untold Gallons of Oil you've been pumpin' into the water many of Us boat, fish, 'n swim in,...

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                    • #11
                      Re: Did i burn my motor? Water in my oil / no comperssion in one cylinder

                      Well, a dropped valve will read 0 psi on compression. Regardless, #6 is inop. due to mechanical failure. Go with a 5.7 truck engine from a junkyard or get a rebuilt long block. Do it this Fall so you will be ready to go when Spring springs.

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                      • #12
                        Re: Did i burn my motor? Water in my oil / no comperssion in one cylinder

                        I notice a lot of you guys mention to go with a truck motor. Will it be a perfect fit on my boat? how can I make sure I will get a perfect match? are you guys meaning get a truck block and head and add all my current components to it?

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                        • #13
                          Re: Did i burn my motor? Water in my oil / no comperssion in one cylinder

                          The 305 & 350 blocks are identical & swap-able. Just the cylinder bore that's different.

                          Post your serial number to find out what vintage 305 we're dealing with ...

                          The cam in a truck motor works fine in a boat, and they typically come with brass freeze plugs.
                          Last edited by LiquidC; August 28th, 2013, 01:52 PM.

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                          • #14
                            Re: Did i burn my motor? Water in my oil / no comperssion in one cylinder

                            Originally posted by gonzalez3346 View Post
                            Hello I have a 1984 Formula 23SC with an I/O Mercruiser 228 5.0L V8. The boat was running fine until I notice oil/water mix coming from my bilge pump. At this point I knew I had and oil leak somewhere. I begin to monitor my oil more often and adding a quart every month or so (I use my boat 4 times a week). Now this is the big problem: The leak got worst, while I was in the water the bilge pump just would not stop pumping that milky stuff (water/oil mixture). I soon turn the boat on and head back to my marina. :
                            Did you seriously go driving around while your bilge was pumping oil into the water? Wow

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                            • #15
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                              Re: Did i burn my motor? Water in my oil / no comperssion in one cylinder

                              Originally posted by Bikeluver43 View Post
                              Did you seriously go driving around while your bilge was pumping oil into the water? Wow
                              Now guys, don't be too hard on him. You never know what conditions someone is boating in. It may not be safe to shut down in rough water or high winds. I'd sacrifice my motor or a slight environmental spill for the sake of my family's safety every time.

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