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  1. #1
    2017 RXT-X 300 zone 5's Avatar
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    Why does engine need to run during flushing?

    As 4 tecs are closed cooled, all you are flushing is the I/C and exhaust manifold. Just wondering how water could get into the engine as it could/can on open loop cooling.


  2. #2
    My new toys at work bruinsrme's Avatar
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    The pressure of the water is strong enuf to back fill the engine with water.

    The engine is closed loop but the exhaust is not. the exhaust and intercooler are cooled by the lake, river or ocean.

    this is the same reason why if you are being towed the exhaust cooling water supply hose needs to be crimped. (refer to owners manual Towing the Watercraft in Water)

    This will prevent the exhaust cooling
    system from filling which may lead to
    water being injected into and filling the
    engine. Without the engine running
    there isn't any exhaust pressure to carry
    the water out the exhaust outlet.
    CAUTION:
    Failure to do thismay result
    in damage to the engine. If you
    must tow a stranded watercraft in
    water and do not have a hose pincher,
    be sure to stay well below the
    maximum towing speed of 24 km/h
    (15 MPH).

    To ease access to the hose, the vent
    tube can be temporarily removed.
    Last edited by bruinsrme; 11-04-2007 at 10:53 PM.

  3. #3
    Yeah, there's the danger of the hose pressure pushing water up the exhaust into the block and hydrolocking the cylinders.

  4. #4
    2017 RXT-X 300 zone 5's Avatar
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    When I winterized it, and poured antifreeze into the hose from the I/C to the exhaust manifold, I had antifreeze run out the exhaust onto the ground. Is this correct?

    But if I run hose pressure to it, that is far greater pressure than just pouring antifreeze into it, so it can back up into the actual exhaust and not just the water jacket?

  5. #5
    My new toys at work bruinsrme's Avatar
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    the hose has a lot more pressure than pouring

  6. #6
    2017 RXT-X 300 zone 5's Avatar
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    Quote Originally Posted by bruinsrme View Post
    the hose has a lot more pressure than pouring
    so the antifreeze coming out is okay and correct?

  7. #7
    My new toys at work bruinsrme's Avatar
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    yes it is the normal flow of the flush

  8. #8

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    I don't think it so much has to do with water pressure so much as it has to do with water backing up into the system. If you look in the back of the ski you'll see that one of the exhaust hoses has a section that rises above the exhaust manifold. Without the engine running, the water will fill the water box, and flow into the engine via the exhaust manifold before it is able to flow out of the exhaust. When the engine is running the exhaust pressure blows the water out through the hose. If you saw antifreeze flow out the back of the ski with the engine off and pouring the correct amount, it probably came from the bypass and not from the actual exhaust system.

  9. #9
    2017 RXT-X 300 zone 5's Avatar
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    Quote Originally Posted by Brian_GP1200R View Post
    If you saw antifreeze flow out the back of the ski with the engine off and pouring the correct amount, it probably came from the bypass and not from the actual exhaust system.
    I assumed that its coming from the bypass hose. There is one on top, and one on the bottom. with the bottom one clamped, no antifreeze comes out. with it unclamped, the antifreeze comes out on top of the ride plate.

    I'm just trying to make sure that is what is supposed to happen, and that the exhaust manifold has enough antifreeze in it. As I'm putting it in from the bottom, and its coming out the bottom, that was my concern that there isn't any on top.

  10. #10
    My new toys at work bruinsrme's Avatar
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    Quote:
    don't think it so much has to do with water pressure so much as it has to do with water backing up into the system. If you look in the back of the ski you'll see that one of the exhaust hoses has a section that rises above the exhaust manifold. Without the engine running, the water will fill the water box, and flow into the engine via the exhaust manifold before it is able to flow out of the exhaust. When the engine is running the exhaust pressure blows the water out through the hose. If you saw antifreeze flow out the back of the ski with the engine off and pouring the correct amount, it probably came from the bypass and not from the actual exhaust system. UnQuote

    Ok that makes sense, pict below is for the 3 seater SC enginers
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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