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  1. #1
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    Unhappy Need Help!!.. Large amount of water in oil sump (350chev)

    Hey guys, sorry for posting a new thread, i searched previous ones for abit but couldn't find one suited to my problem.
    I recently purchased a skicraft boat with an inboard 350chev. It has a high rise edelbrock manifold with a holley 650 double pump carby. Im not very knowledgable about these engines, but will be purchasing a manual soon.

    We took it for a spin in the lake for only 15 minutes, only to come back in and find a milky explosion under the engine cover. The oil cap on the rocker cover blew off and sprayed milky oil all over the motor. The breather hose on the other cover (which isnt restricted) blew milky oil all over the other side of the motor. I drained the oil , and was horrified that i would estimate 2litres of warm water came out first before any oil decided to come out. The engine was running fine (plenty of power, no sputtering or coughing) , but i brought it in as it began to lose oil pressure and was running very rough. The motor does not overheat, temperature only rises slightly when idiling in the water, but goes down when starting to accelerate.

    What could cause so much water to enter the sump in such a short amount of time. The water was definitely not in the sump before i took it out.
    I did notice one of the exhaust pipe caps at the back of the boat had lost a bolt, and it was not closing one of the exhaust pipes properly.

    Any help would be much appreciated
    Last edited by Nevenm; 08-11-2017 at 12:50 PM.

  2. #2
    Do you ever leave? paulzig's Avatar
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    Maybe headgasket(s) blown ... You have a sump full of water, oil pressure dropping, I'd be pulling the engine and tearing it down to see if there is any damage.

  3. #3
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    Blown head gasket or corrosion or both. When you strip the engine down you'll find it, pretty common for salt water lake boats. If there is much corrosion in the heads turf them and rebuild others.

  4. #4
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    Thanks for the reply guys, I pulled the inlet manifold cover off and the gasket was pretty stuffed. Where the closed ports on on the manifold especially. There is signs of saltwater corrosion that has especially corroded the gasket away. The port inside the head is corroded but hasn't worn through the block. I'm hoping to replace this gasket flush the block with diesel and do a full service. Just hoping No damage done to the bottom end. It's a freshwater boat but the last owner said he took it out in the salt a fair few times

  5. #5
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    Pull the heads off. Worst case is a pair of gaskets and a half days work. Cheap insurance.

  6. #6
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    Yeah ok I will, thanks.. I was told the head gaskets are not common to go unless the engine was overheated.

  7. #7
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    Different story on a salt water boat. Might be fine but you are halfway there and will give you a chance to inspect better.

  8. #8
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    Yeah true salt is nasty. if only it was flushed properly...Thanks for the replies

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