Generator Water Ingestion

Discussion in 'General Maintenance/Repair Questions' started by wyrman, Jun 9, 2019.

  1. wyrman

    wyrman Well-Known Member SILVER Sponsor

    Jul 12, 2012
    Tri-Cities, Wa
    2007 310 Sundancer
    Twin 350's, V drives
    1994 18' Bluewater bowrider
    My Kohler EC5 has water in both cylinders. It's river water, if I close the seacock, I can get the water out, but once I open it, it fills back up.
    There's not water in the oil, and the compression is 195 and 210.
    Any suggestions?
     
  2. wyrman

    wyrman Well-Known Member SILVER Sponsor

    Jul 12, 2012
    Tri-Cities, Wa
    2007 310 Sundancer
    Twin 350's, V drives
    1994 18' Bluewater bowrider
    I was doing a little reading, and someone had theirs fill up from running with the seacock open. Said something about a bad pick up.
    I hadn't started mine this season, just opened up the seacock, and have gone out once or twice since.
     
  3. Sublimetime

    Sublimetime Active Member

    673
    Oct 22, 2007
    clifton nj
    420 da
    454
    Check the vacuum breaker on the cooling water hose, its located between where it enters the exhaust elbow.
     
  4. hottoddie

    hottoddie Well-Known Member

    Jan 11, 2012
    Boston/Cape Cod
    1986 Sea Ray 390 EC
    Garmin 4212 Chartplotter
    Garmin 24 HD Radar
    Garmin 546s Plotter
    454 Crusaders
    Are you saying the cylinders fill with water while sitting at the dock or when underway? I know that Westerbeke states in their owners manual to "NOT" install a scoop style pickup on the intake for this very reason.
     
    dwna1a likes this.
  5. wyrman

    wyrman Well-Known Member SILVER Sponsor

    Jul 12, 2012
    Tri-Cities, Wa
    2007 310 Sundancer
    Twin 350's, V drives
    1994 18' Bluewater bowrider
    I really don't know. I opened the seacock, and have been out once since then.
    I didn't try starting it until later.
     
  6. wyrman

    wyrman Well-Known Member SILVER Sponsor

    Jul 12, 2012
    Tri-Cities, Wa
    2007 310 Sundancer
    Twin 350's, V drives
    1994 18' Bluewater bowrider
    OK, will do that. Thank you.
     
  7. hottoddie

    hottoddie Well-Known Member

    Jan 11, 2012
    Boston/Cape Cod
    1986 Sea Ray 390 EC
    Garmin 4212 Chartplotter
    Garmin 24 HD Radar
    Garmin 546s Plotter
    454 Crusaders
    Is this boat new to you? Is this a recent development or have you owned the boat for a while and this just developed recently?
     
  8. wyrman

    wyrman Well-Known Member SILVER Sponsor

    Jul 12, 2012
    Tri-Cities, Wa
    2007 310 Sundancer
    Twin 350's, V drives
    1994 18' Bluewater bowrider
    This is my second season with it.
    The plugs fouled last year because the batteries were bad, and I had a no start.
    Once I replaced the batteries and plugs, it worked great.
     
  9. Sublimetime

    Sublimetime Active Member

    673
    Oct 22, 2007
    clifton nj
    420 da
    454
    If the vacuum breaker is not functioning correctly it will allow a siphon to be started- water supply at the thru hull is siphoned up and over into the exhaust elbow. This causes the muffler to fill with water, but being a canister muffler it can not drain out overboard unless motor is running, so it fills up and then back into the motor
     
  10. wyrman

    wyrman Well-Known Member SILVER Sponsor

    Jul 12, 2012
    Tri-Cities, Wa
    2007 310 Sundancer
    Twin 350's, V drives
    1994 18' Bluewater bowrider
    I sure hope that's it. I have to wait until Friday to check it out.
    How would one check to see if it's working?
    I did a search on it, and very little comes up.
     
  11. PlayDate

    PlayDate Well-Known Member

    Dec 25, 2006
    Washington DC
    1994 370 Express Cruiser
    454 Mercruisers
    The vacuum break has a small one way valve at the top of it that you can unscrew. When pressurized with water the valve seals. The valve opens when the pressure drops to allow air into the line so the line is not filled with water. I don't think that is the problem you are having.
    [​IMG]


    3.7.4 Siphon Break A siphon break prevents seawater entry into the generator set’s engine when the engine exhaust manifold outlet is less than 230 mm (9 in.) above the waterline of a fully loaded, docked or stationary craft. See Figure 3-9. The siphon break may malfunction when the generator set operates while the craft is in contaminated waters or saltwater. Use the following procedure to inspect the siphon break at the intervals listed in the service schedule. Siphon Break Inspection
    1. Stop the generator set.
    2. Remove the retaining cap and remove the reed valve for inspection. See Figure 3-8.
    3. Use a mild detergent to remove residue and oxidation from the reed valve.
    4. Clear blockage from the reed valve opening.
    5. Replace the siphon break if the reed valve is cracked or if the reed valve material has hardened or deteriorated.
    6. Install the reed valve into the mounting base with the valve downward.


    I would be more concerned about a cracked exhaust manifold leaking water into the cylinders. The manifold is cooled by raw water and if cracked will leak water into the exhaust ports, pass the valves and into the cylinders. Normally, the impeller holds raw water at bay but it doesn't take a lot of pressure for water to push past it.
     
  12. wyrman

    wyrman Well-Known Member SILVER Sponsor

    Jul 12, 2012
    Tri-Cities, Wa
    2007 310 Sundancer
    Twin 350's, V drives
    1994 18' Bluewater bowrider
    Is another name for the exhaust manifold the catalyst assembly?
     

    Attached Files:

  13. PlayDate

    PlayDate Well-Known Member

    Dec 25, 2006
    Washington DC
    1994 370 Express Cruiser
    454 Mercruisers
  14. Bt Doctur

    Bt Doctur Well-Known Member

    Aug 21, 2010
    New Jersey
    Ex SRV 240 Weekender twin
    in between
  15. PlayDate

    PlayDate Well-Known Member

    Dec 25, 2006
    Washington DC
    1994 370 Express Cruiser
    454 Mercruisers
    I believe they are for the same model.

    If you look at the link I posted it shows the model with an optional siphon break which is either in place or not. If it isn't....that raises a question. If it is present then it would be a good thing to check the reed valve.

    Short of that .....water can't be coming through the intake on a two cylinder engine so it has to come from the exhaust. I'm speculating ......but if it does have a siphon break I would remove the muffler feed and put a hose to it. Somehow the water is backing up into the exhaust ports. I don't know this particular generator model but the drawing shows the exhaust path and if components are cooled by raw water......it has to be there.
     
  16. wyrman

    wyrman Well-Known Member SILVER Sponsor

    Jul 12, 2012
    Tri-Cities, Wa
    2007 310 Sundancer
    Twin 350's, V drives
    1994 18' Bluewater bowrider
    I need to go to the boat and take a look again. Both the ones you and Bt Doctur linked to look really close.
    I had a picture, let me see if I can find it.
    Plus I have the manual on my work computer, I can verify it tomorrow, and print it.
    I really appreciate the help, II'm pretty mechanically inclined, but working in generators is new to me.
     
  17. wyrman

    wyrman Well-Known Member SILVER Sponsor

    Jul 12, 2012
    Tri-Cities, Wa
    2007 310 Sundancer
    Twin 350's, V drives
    1994 18' Bluewater bowrider
  18. wyrman

    wyrman Well-Known Member SILVER Sponsor

    Jul 12, 2012
    Tri-Cities, Wa
    2007 310 Sundancer
    Twin 350's, V drives
    1994 18' Bluewater bowrider
    I did notice a hose mounted high with a fitting in the middle of it when I was putting my fuel modulator back on, that has to be it.
     
  19. PlayDate

    PlayDate Well-Known Member

    Dec 25, 2006
    Washington DC
    1994 370 Express Cruiser
    454 Mercruisers
    Your picture shows the hoses going to a siphon break which is out of the picture frame so that answers that question. I would check the reed valve on the siphon break and put water through the hose that feeds the muffler to ensure there are no obstructions which is causing the water to back up.
     
  20. wyrman

    wyrman Well-Known Member SILVER Sponsor

    Jul 12, 2012
    Tri-Cities, Wa
    2007 310 Sundancer
    Twin 350's, V drives
    1994 18' Bluewater bowrider
    The siphon break seems to be working properly.
    I turned it over a few times and all that came out of the cylinders was the wd-40 that I sprayed in last time.
    I started it three times now, and so far so good.
    Could it have just been one of those things?
     

    Attached Files:

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