Water in cylinders and oil. Help!
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Water in cylinders and oil. Help!

  1. #1
    Junior Member Cap-n-Carl's Avatar
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    Default Water in cylinders and oil. Help!

    This doe's not concern what I would call a Performance boat, I'm just trying to help a freind. 2008 Volvo Penta 496 with raw water cooling, cast manifolds and thru prop exhaust. The owner forgot to put the cap back on the flush port, took the boat out for a spin and within five minutes the engine over-heated. The pick-up pump was most likely sucking air thru the flush port. After the temp went down, He tried to restart the engine to find it would not turn over and the breaker would kick out. The boat gets towed in. As it turns out, the pistons were hydro-locking! Water in the cylinders on both sides and milk shake for oil! What the hell happend? We can't figure out how water got in both cylinder banks and how did water get in the oil as well? I told my buddy, the first thing I would do would be a compression test then take it from there.
    Does anyone out there have a clue as to what might have happend. How could this all be linked together? Thanks for the help!

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    New here Beer:30's Avatar
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    Quote Originally Posted by Cap-n-Carl View Post
    This doe's not concern what I would call a Performance boat, I'm just trying to help a freind. 2008 Volvo Penta 496 with raw water cooling, cast manifolds and thru prop exhaust. The owner forgot to put the cap back on the flush port, took the boat out for a spin and within five minutes the engine over-heated. The pick-up pump was most likely sucking air thru the flush port. After the temp went down, He tried to restart the engine to find it would not turn over and the breaker would kick out. The boat gets towed in. As it turns out, the pistons were hydro-locking! Water in the cylinders on both sides and milk shake for oil! What the hell happend? We can't figure out how water got in both cylinder banks and how did water get in the oil as well? I told my buddy, the first thing I would do would be a compression test then take it from there.
    Does anyone out there have a clue as to what might have happend. How could this all be linked together? Thanks for the help!
    Sounds like double blown head gaskets. At least one side, but likely both. The extreme heat warps the surfaces between the heads and block. This allows all of the passages (coolant, oil, piston/cylinders) to share with one-another.

    Are you sure it doesn't have CLOSED COOLING? The raw water would then just circ through the coolers and heat-exchanger. The exchanger and motor would have actual coolant/anti-freeze inside the cooling passages. Thus, the coolant would be what was hydro-locking the motor?
    Last edited by Beer:30; 10-21-2012 at 09:32 PM.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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    Junior Member Cap-n-Carl's Avatar
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    Quote Originally Posted by Beer:30 View Post
    Sounds like double blown head gaskets. At least one side, but likely both. The extreme heat warps the surfaces between the heads and block. This allows all of the passages (coolant, oil, piston/cylinders) to share with one-another.

    Are you sure it doesn't have CLOSED COOLING? The raw water would then just circ through the coolers and heat-exchanger. The exchanger and motor would have actual coolant/anti-freeze inside the cooling passages. Thus, the coolant would be what was hydro-locking the motor?
    No, definitly raw water cooled. My budd claims he shut down as soon as the buzzer went off so I doubt he cooked the engine. Two head gaskets at the same time? What are the odds! We are doing a compression test today, wondering what we will find!

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    New here Beer:30's Avatar
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    Quote Originally Posted by Cap-n-Carl View Post
    No, definitly raw water cooled. My budd claims he shut down as soon as the buzzer went off so I doubt he cooked the engine. Two head gaskets at the same time? What are the odds! We are doing a compression test today, wondering what we will find!
    All of the V-P 8.1 versions I see / have seen are all closed cooling with the large tube-like heat exchanger up front. Did your friend take OFF the closed-cooling?

    Again....just a guess on both. Your first post makes it sound pretty bad, so I am shooting for worst-scenario. Although cracks in the block and heads are also possibilities from severe overheat. He/you won't know much until a compression test is done to determine which cylinders have compression and which don't.

    If a cylinder is compromised between another cylinder, there will be zero compression in both of those holes. When one tries to make compression, it will bleed into the other. OR, they may bleed into the water jackets instead of each other. In which case, there will be air pressure breathing out through the water system when the motor is turned over.

    You would also find out if a piston/rod or more of those were hurt with the hydro-locking. Hard to do with just the starter motor, but all of those components tend to get bent when the engine tries to fire with one or more cylinders full of a substance that does NOT compress.
    Last edited by Beer:30; 10-22-2012 at 08:07 AM.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

  7. #5
    deckboat owner rschap1's Avatar
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    Default riser gaskets??

    I got my motor hot last summer.
    Riser bolts stretched and let gaskets leak after I re-started with new impeller.
    That would account for the hydro-lock.
    Maybe tried so hard to start it after that it pushed the water past rings into oil...

    BUT, I would suspect head gaskets too.

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