Engine Flush

Discussion in 'Winterizing' started by menos22, Nov 16, 2018.

  1. menos22

    menos22 Member

    68
    May 26, 2009
    Colonial Beach, VA
    1994 Sea Ray 350 Express Bridge
    Twin 454 Mercruiser With V-Drives
    Need some expert advice. I made a engine flush kit by drilling out a spare strainer cap to allow for a garden hose to be connected. I plan on closing the sea cock valve, removing the strainer cap and put the modified cap on, connect a garden hose to the cap and put the other end in a bucket of pink stuff, start the engine and wait for pink to flow out the exhaust. My question is since the sea cock is closed when I start the engine where will the water that is being sucked up by the impellers go, the boat is in the water. Will it build up too much pressure or damage the impellers? Any advice would be appreciated. Thank you. 7.4l 454ci bluewaters. 1994 350 express bridge.
     
  2. cfd95

    cfd95 Member

    294
    Nov 5, 2013
    Northport Long Island
    2002 310 Sundancer
    350 Horizons
    V Drives
    Ive never had a problem with it sucking the antifreeze out of the bucket.
    You could use a small funnel and fill the hose with antifreeze then stick it in the bucket if you have a problem with it drawing in the antifreeze.
     
  3. Sublimetime

    Sublimetime Active Member

    523
    Oct 22, 2007
    clifton nj
    420 da
    454
    Closing the sea cock and adding modified cap will do exactly as you said (priming the hose before you drop it in bucket like the last post says is a good idea, it starts the flow faster).

    your question- where does the water go, I think you mean the pink stuff your sucking in , where does that go???
    With sea cock closed your not sucking from "the water" any more.
    When the pink stuff starts to flow it will go out the exhaust like normal cooling water goes out.
     
    WV 320 Dancer likes this.
  4. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor

    Apr 21, 2009
    PA
    Various
    Various
    I think you may be thinking too much. As mentioned above, there are no issues doing it the way you are talking about. The IMPELLER builds the pressure to push the AF through the system and out the exhaust as normal. There will be no "extra" pressure built up. Do you have canister mufflers? If so, drain those.

    Try to drain what you can, first. Even just closing the seacock and opening the strainer for a while will drain some of the water. It would be good to drain your heat exchanger.

    Don't forget to fog - it can only help. Have you been running treated (Startron, for example) fuel?
     
  5. menos22

    menos22 Member

    68
    May 26, 2009
    Colonial Beach, VA
    1994 Sea Ray 350 Express Bridge
    Twin 454 Mercruiser With V-Drives
    Thanks guys, will prime hose before putting in the bucket. Yes the fuel is treated and yes I have canister mufflers, will drain those. I understand where the pink stuff goes was wondering where the sea water goes when I start the engine; Answering my own question, (it goes nowhere with the seacock closed]. The impellers are still turning while the engine is running so I guess they are sucking the pink stuff out of the bucket and pushing it through the engine via the impeller. Think I got it. Thanks for the comments and advise. Happy Thanksgiving to all. Mike
     
  6. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor

    Apr 21, 2009
    PA
    Various
    Various
    Yes, you got it. The impeller will suck whatever is in the strainer. It does not matter "how" the particular fluid gets into the strainer - whether it's via the seacock or by you pouring something into it (could be actually pouring or feeding via a hose).
     

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