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Thread: Half of one engine running hotel

  1. #1
    Join Date
    Jan 2008
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    Default Half of one engine running hotel

    Good morning. Iím at my wits end. I have twin v8ís. One hundred percent raw water cooled.
    Half of my port engine is running substantially hotter. Iíve replaced circulating pump. Replaced pump impellers on raw water pumps. New manifolds and elbows and hoses. Donít think itís a head gasket no water in the oil. Any ideas?

  2. #2
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    Walney, near Cumbria UK
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    Default Re: Half of one engine running hotel

    Some of the waterways clogged with salt, mud and possibly rust.
    It really is quite difficult to build an ugly wooden boat.

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  3. #3
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    Pleasant Valley NS Canada
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    Default Re: Half of one engine running hotel

    Possibly an obstruction in the internal coolant passages in the head. How long since the engine cooling system has been flushed?
    Hope for the best, but plan for the worst.

  4. #4
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    Default Re: Half of one engine running hotel

    When I took my raw water cooled 283 apart, I found amazing amounts of blockage. Ended up having the block boiled - but still had to manually clean up passages going to the heads.
    "If it ain't broke, you're not trying." - Red Green

  5. #5
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    Default Re: Half of one engine running hotel

    Quote Originally Posted by Garret View Post
    When I took my raw water cooled 283 apart, I found amazing amounts of blockage. Ended up having the block boiled - but still had to manually clean up passages going to the heads.
    The old boys around here used to boil the head and calender blocks in washing soda.
    It really is quite difficult to build an ugly wooden boat.

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  6. #6
    Join Date
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    Northern NSW Australia
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    Default Re: Half of one engine running hotel

    Replace the thermostat.
    '' You ain't gonna learn what you don't want to know. ''
    Grateful Dead

  7. #7
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    Apr 2010
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    Default Re: Half of one engine running hotel

    Try a different Hotel

  8. #8
    Join Date
    Jul 2013
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    USA
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    Default Re: Half of one engine running hotel

    Must be a small hotel...maybe one of those "boutique"ones...

  9. #9
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    Default Re: Half of one engine running hotel

    Quote Originally Posted by PeterSibley View Post
    Replace the thermostat.
    That too replaced. only left 1/2 of the engine getting hot.

  10. #10
    Join Date
    Mar 2006
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    La Conner, WA
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    Default Re: Half of one engine running hotel

    I am guessing that one of the risers from the manifolds is plugged and not passing exhaust water, it should show a lot hotter temp from an infrared temp sensor.

  11. #11
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    Default Re: Half of one engine running hotel

    Quote Originally Posted by Paul Schweiss View Post
    I am guessing that one of the risers from the manifolds is plugged and not passing exhaust water, it should show a lot hotter temp from an infrared temp sensor.
    As stated in the opening post. Raw water cooled. All manifolds and elbows changed out.

  12. #12
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    Default Re: Half of one engine running hotel

    What is the engine?

  13. #13
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    Mar 2007
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    East Quogue,NY
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    Default Re: Half of one engine running hotel

    Is it a Mercruiser? The exhaust flapper installed in the downtube/ Y tube on that side may be installed backwards, retaining exhaust gas.

    Kevin
    There are two kinds of boaters: those who have run aground, and those who lie about it.

  14. #14
    Join Date
    Mar 2001
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    FL
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    Default Re: Half of one engine running hotel

    Assuming full water delivery is getting to the engine...Pulling a head off will likely hint whether its a debris restriction or salt buildup. I'd guess crystallized salt in the water passages. If so, you could try running oxalic acid though it without much effort or cost. Oxalic will dissolve salt and not harm the other parts. I've done it on two gas sailboat engines with ok results. Get the engine warm. Disconnect the raw water intake end and put the end into a 5 gal bucket of oxalic acid...powder or crystals mixed in water. Suck the bucket down and shut the engine off with the block full of that water. Let sit overnight and do it a couple times. It may help and you will be amazed how much crud comes out the exhaust.

  15. #15
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    Default Re: Half of one engine running hotel

    You have mentioned replacing both the circulating pump and the impellers on the raw water pumps. This implies something other than "raw water cooling".

    The symptoms described indicate little or no coolant flow on one side of one engine.

    A diagram of your specific setup can likely be found online.

  16. #16
    Join Date
    Jan 2002
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    RI ,USA
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    Default Re: Half of one engine running hotel

    A friend of mine had that issue on a 350. Turns out the riser or manifold ports were way undersized by design. He reamed them out some how, he may have eventually replaced them. They were clogged with rust

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