Running Engine On Land?

Discussion in 'General Discussion' started by wyrman, Apr 8, 2020.

  1. wyrman

    wyrman Well-Known Member

    Jul 12, 2012
    Tri-Cities, Wa
    2007 310 Sundancer
    Twin 350's, V drives
    1994 18' Bluewater bowrider
    I have v-drives and would like to change my oil before putting it back in the water.
    Is there a way to run the engines to warm up the oil while on the trailer?
     
  2. KevinC

    KevinC Well-Known Member

    Feb 25, 2011
    Long Island, NY
    2004 340 Sundancer
    Twin 8.1 V-drives
    Close your seacock to the strainer. Pop open the cap and feed it water with a garden hose.

    I use a small scrap piece of hose with a garden shutoff valve to regulate the flow. When I use full flow it will over run the pull of my 8.1s and overflow. By backing down the flow I can find an equilibrium.

    It helps to have someone at the strainer and someone at the helm starting the engines.

    -Kevin
     
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  3. Golfman25

    Golfman25 Well-Known Member

    Sep 12, 2009
    IL
    281
    V8
    If Kevin's method won't work, you can take the intake hose off the sea cock. Then feed a five gallon bucket with a hose and put the intake hose in the bucket. Regulate the flow so you have equilibrium.
     
    Chris-380 likes this.
  4. wyrman

    wyrman Well-Known Member

    Jul 12, 2012
    Tri-Cities, Wa
    2007 310 Sundancer
    Twin 350's, V drives
    1994 18' Bluewater bowrider
    Thank you guys.
     
  5. play dough

    play dough Active Member

    316
    Aug 29, 2011
    Mackinaw City, Michigan
    1997 330 Sundancer, 7.4L MPI V-Drive
    7.4L MPI Mercruiser
    When I had a trailer boat with the through hull water pickup, I used a device called "fake-a-lake" that went over the pickup on the hull and attached to a garden hose. Google it for a source. It's sold by all the marine suppliers.
     
  6. KevinC

    KevinC Well-Known Member

    Feb 25, 2011
    Long Island, NY
    2004 340 Sundancer
    Twin 8.1 V-drives
    While this may be suitable for a smaller trailer boat with poor access to the water intake - I would not recommend it for a larger cruiser with inboards and v-drives. I feel you are better to stay in visual contact with the water flow at the strainer as if attachment gets knocked off for any reason then you will quickly burn up you impellers in the water pump.

    Optimally, a Tee'd in supply port on the intake side for a direct hose connection would be the best/easiest but you would also need to make sure to follow the recommendations on the water shutdown after turning off the engine to not over run the exhaust and hydrolock the engine.

    @mnm99 described and installed such a system here: http://www.clubsearay.com/index.php?threads/new-flush-system-installed.87193

    -Kevin
     
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  7. JimG

    JimG Well-Known Member SILVER Sponsor

    Nov 4, 2008
    Southern WV
    2007 310 DA
    Kohler 5ECD
    Twin 350 Mags
    Raw Water Cooled
    V-Drives
    Mine (same boat as wryman) has a flush port... it came with a snap in fitting that connects to a water hose. I've never ran the motors this way, but I assume I can? Anybody have similar fittings?
     
  8. Golfman25

    Golfman25 Well-Known Member

    Sep 12, 2009
    IL
    281
    V8
    I would not do any type of flush connection for fear the the hose pressure would flood the engine. Let the water pumps do their job.
     
  9. wyrman

    wyrman Well-Known Member

    Jul 12, 2012
    Tri-Cities, Wa
    2007 310 Sundancer
    Twin 350's, V drives
    1994 18' Bluewater bowrider
    I have something that looks like some kind of hose connection on top of the engines.
     
  10. Bt Doctur

    Bt Doctur Well-Known Member

    Aug 21, 2010
    New Jersey
    Ex SRV 240 Weekender twin
    in between
    You may fill up the mufflers but you wont flood an engine . For my inboard customers I remove the hose from the strainer, slide in a garden hose , turn on the water, start the engine, you introducing water before the impeller and it cant flow thru unless the impeller is turning.
    Pushing water into an engine after the impeller will flood the mufflers and it can back up into the cylinder

    Some have removed the cap of the strainer and installed a threaded hose conection directly into the cap and shutoff for flushing
     
    Chris-380 likes this.
  11. DWABoat

    DWABoat Well-Known Member

    614
    Aug 13, 2019
    S Louisiana
    2001 280 Sundancer
    1989 220CC Cuddy Cabin
    Twin 4.3 w/Alpha Ones
    5.7 Mercruiser Alpha One
    I also pull the strainer cap off and run a hose into the strainer. Be sure to turn off the sea cock. If you are on the trailer, just take your plug out and any overflowing water will drain out the bilge. I run my generator this way as well.
    I have run my generator, 4.3’s, and Cummins diesel QSB 5.9’s and 6.7’s this way for years with no issues.
    Take your time. Secure the hose with nice large clamps first. Let the water run while watching your hose to make sure it will not flop out on you. After you know it will stay in place, start your engine. Then keep an eye on the hose connection.
     

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