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Thread: De-winterizing Merc 5.7

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  1. De-winterizing Merc 5.7

    So, as the topic reads.
    I winterized my engine myself, drained it of water through plugs and filled with antifreeze through thermostat housing. Now I'm thinking what's the smoothest way to get it all out? Just run the boat on land and collect it in something at the rear?

    How do you all do it?
    Boat is a 2000 20i with 5.7 MAG/MPI

  2. #2
    Join Date
    Jan 2004
    Location
    Mount Juliet, TN
    Posts
    2,598
    Boat
    Tigé
    If pink marine antifreeze you are good to go.

  3. #3
    Join Date
    Aug 2010
    Location
    Long Beach, CA
    Age
    44
    Posts
    1,091
    Boat
    2015 Z3, 1999 2100i
    Meaning you can just drop it in the lake and go, the marine antifreeze is biodegradable.
    Fixing everyone elses boat just so I can use mine...

  4. #4
    Join Date
    Jan 2010
    Location
    Lethbridge Alberta, Canada
    Posts
    184
    Boat
    2002 20i
    The crowd always likes the smoke show it produces.

  5. #5
    Join Date
    Aug 2015
    Location
    Salt Lake City, Utah
    Posts
    1,468
    Boat
    2017 RZX3, 2013 MB F24, 2000 21V
    There is just something wonderful about dewinterizing.

  6. #6
    Join Date
    Jan 2004
    Location
    Mount Juliet, TN
    Posts
    2,598
    Boat
    Tigé
    Quote Originally Posted by UNSTUCK View Post
    There is just something wonderful about dewinterizing.
    Yep, warm weather gets closer!

  7. #7
    Join Date
    Apr 2006
    Location
    Lake Wylie area, NC
    Age
    50
    Posts
    27,855
    Boat
    Back in the good ol' days a 2006 22ve
    Im always a fan of running one on a fake-a-lake prior to hitting the lake. never wanted to be that guy with the boat that wont start, while the ramp is 12 deep with other boats wanting to launch, and the trailer was already pulled away and parked.
    Mikes Liquid Audio: Knowledge Experience Customer Service you can trust-KICKER WetSounds ACME props FlyHigh Custom Ballast Clarion LiquidLumens LEDs Roswell Wave Deflector And More

  8. #8
    Join Date
    Feb 2011
    Location
    Calgary, Alberta
    Age
    40
    Posts
    1,851
    Boat
    2013 Tigé Z1 Vx
    Quote Originally Posted by chpthril View Post
    Im always a fan of running one on a fake-a-lake prior to hitting the lake. never wanted to be that guy with the boat that wont start, while the ramp is 12 deep with other boats wanting to launch, and the trailer was already pulled away and parked.
    Agreed. Start it at home, or at least be smart enough to back it in and start it before you drive off the trailer.

  9. #9
    Join Date
    Feb 2016
    Location
    Boise, ID
    Posts
    1,832
    Im in the same camp as Johnnie and Chp. Run on a fake a lake until thermostat opens and check alternator voltage. No fun having the stereo go dead then the boat go dead, or overheating after you thought you did your due diligence.

  10. #10
    Join Date
    Oct 2018
    Location
    Parker, TX
    Posts
    94
    Boat
    Tige R23
    Quote Originally Posted by freeheel4life View Post
    Im in the same camp as Johnnie and Chp. Run on a fake a lake until thermostat opens and check alternator voltage. No fun having the stereo go dead then the boat go dead, or overheating after you thought you did your due diligence.
    How do you verify thermostat opens? Just wait until temp reaches operating temp?


    Sent from my iPhone using Tapatalk

  11. #11
    Join Date
    Feb 2016
    Location
    Boise, ID
    Posts
    1,832
    Quote Originally Posted by Bamer View Post
    How do you verify thermostat opens? Just wait until temp reaches operating temp?


    Sent from my iPhone using Tapatalk
    Yup. Its a rare one but it can happen(thermostat stuck closed). If you let run on the fake a lake it will get up to temp and hold. If thermostat doesnt open it will just keep climbing. My cutoff is usually 180. No need to let it get really hot.

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