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Mercruiser 3.0 in colder weather

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  • Mercruiser 3.0 in colder weather

    I’ve had my boat (bayliner 175 with mercruiser 3.0) for 13 years and typically winterized by this time (nov) here in Southern Ontario, however this year I’m pushing the season longer to do more fishing. Boat stays in attached (to house) garage (not heated, 2 insulated walls) when not in use. Plan is to get out on the water in close to freezing temps but won’t go if well below freezing. When pulling out of water, will drain with 2 blue hoses at the launch and lower outdrive a few times, tow home into garage, wet/dry vac the drains to ensure all water is out, pull 3 black hoses and fill with antifreeze (yes each time I go out), I believe one fills the block, the other the manifold and the lowest tube to the lower end and intake/pump etc, and then for insurance have purchased a bilge heater and a blanket to put over the engine compartment blocking the vents when not in use.
    Have been reading A LOT online to get more familiar with the boat engine.
    Has anyone done this? Am I missing anything that could cause damage? Thanks!

  • #2
    Sounds like you got it, only thing in the manual it discusses probing the drive holes, and crank the motor (without starting) slightly to clear water from pump

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    94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
    95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
    07 Seadoo GTX
    Merc Adults Only VP Adults Only
    G-Dad always said "First Liar doesn't stand a chance"

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    • #3
      For years here in Idaho, I have been doing frequent draining and boating trips in the fall. I pull back to the house, fire up on muffs to get warm, then pull all my 5 of my drain plugs(2 block, 2 manis and oil cooler) and the water pump hose. With the outdrive down I make sure all the drive drain holes are open and then I park it till I need it again. Had any number of nights in the teens doing this over the years. I make sure the water is all out though.
      17 Foot '90 Bluewater
      Alpha 1 3.0 Merc - repowered in 2016
      now - 4.3L Vortec - Alpha 1 GenII
      Honda BF100L kicker
      Engine custom - Transom 0D65328 - Drive 0D648864
      If you ain't fishin, then yer working too much.

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      • #4
        Originally posted by Rick Stephens View Post
        For years here in Idaho, I have been doing frequent draining and boating trips in the fall. I pull back to the house, fire up on muffs to get warm, then pull all my 5 of my drain plugs(2 block, 2 manis and oil cooler) and the water pump hose. With the outdrive down I make sure all the drive drain holes are open and then I park it till I need it again. Had any number of nights in the teens doing this over the years. I make sure the water is all out though.
        Ayuh,...... Durin' the few years I chased Muskies up on the big river, in the high teens, low 20s,......

        I did all of this, At the boat launch,...... As soon as it was on the wagon, 'n shut-down,......

        You'll never have a problem, so long as ya get the water Out of it, 'n drainin', done right, does the job,.......

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        • #5
          Thanks guys,
          so when turning the engine over without starting, is it better to pull the kill switch so there no chance of the engine starting. Or just turn it over quickly making sure it’s not enough to start?

          Thanks Rick, I wasn’t considering starting it back up in the driveway but I’ll have to give that some thought. I was debating fogging the engine on the way out at the launch just in case the next outing isn’t for a while. We have a few boat options for fishing (my buddies all have outboards!)

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          • #6
            so when turning the engine over without starting, is it better to pull the kill switch so there no chance of the engine starting. Or just turn it over quickly making sure it’s not enough to start?
            I'm just passing manual info along and yes that would work.

            Listen to Rick and Bondo they have you covered
            94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
            95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
            07 Seadoo GTX
            Merc Adults Only VP Adults Only
            G-Dad always said "First Liar doesn't stand a chance"

            Comment


            • #7
              Originally posted by Bondo View Post

              Ayuh,...... Durin' the few years I chased Muskies up on the big river, in the high teens, low 20s,......

              I did all of this, At the boat launch,...... As soon as it was on the wagon, 'n shut-down,......

              You'll never have a problem, so long as ya get the water Out of it, 'n drainin', done right, does the job,.......
              Yer right! I'm not smart enuf to have the tools settin ready to go when I get out. Your method makes a lot of sense, particularly since the ramp is normally nekid of people in the fall. Open it up, drive home and park it.
              17 Foot '90 Bluewater
              Alpha 1 3.0 Merc - repowered in 2016
              now - 4.3L Vortec - Alpha 1 GenII
              Honda BF100L kicker
              Engine custom - Transom 0D65328 - Drive 0D648864
              If you ain't fishin, then yer working too much.

              Comment


              • #8
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                Awesome. The ramp we use on the Niagara River gets very busy with fishermen and there’s only one ramp on the Canadian side of the entire river which is crazy! But there’s room to pull out quickly and then off to the side where I’m hoping to drain the engine in about 15 min and then get back to the garage to pull hoses and fill with antifreeze

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