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  1. #1
    Seaman
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    May 2007
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    Default How many drain plugs on a 4.3 v6 merc

    hey guys, had my boat already winterized but took it out today for a final run. I managed to locate 4 blue drain plugs and let the water out. However cudnt see any more, just wondering if i got them all or is there another one hiding somewhere.

    Would like to get it sorted before the cold weather. its an 05 mercruiser 4.3 s/n ow325312

  2. #2
    Honorary Moderator Emeritus Don S's Avatar
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    Default Re: How many drain plugs on a 4.3 v6 merc

    Do you have a closed cooling system? or is it raw water cooled? Power steering? I can assume you don't have a service manual or owners manual?
    To answer your question, somewhere between 3 and 7
    Don S.


    Please, no PM's (Private Messages) regarding boat/engine problems.
    That is what the forums are for.
    Only forum/moderator issues will be answered in PM's.

  3. #3
    Seaman
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    Default Re: How many drain plugs on a 4.3 v6 merc

    she is raw water cooled and yes has power steering. I sucessfully removed 4 but didnt see anymore.

    What do you think ?

  4. #4
    Petty Officer 1st Class
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    Default Re: How many drain plugs on a 4.3 v6 merc

    You will want to disconnect the hose from the power steering cooler..

    Otherwise water will remain trapped in there and could burst the cooler.
    If you hear hoof beats and it looks like a horse, and it smells like a horse.... there is a pretty good chance it is a horse. So you go ahead and think "horsey", not "unicorn".

    1996 Bayliner 2050 SS

  5. #5
    Fleet Admiral Gary H NC's Avatar
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    Default Re: How many drain plugs on a 4.3 v6 merc

    Should be at least 2 on the manifolds,2 on the block,one on the steering cooler,plus pulling hoses and draining them and the engine water pump too.

    I take it a shop winterized it for you?
    It needs to be done again and the engine fogged...Let a pro do it or you will be posting here in the spring,why is my engine leaking,overheating or water in the oil....


    1981 ChrisCraft 210 Scorpion K,175 Johnson SeaHorse

  6. #6

  7. #7

    Default Re: How many drain plugs on a 4.3 v6 merc

    Dalton,
    just did this for the first time today after speaking with a technician. There are 5 on my 4.3L Mercruiser (2006 Tahoe Ski boat). Looking at the engine in from inside the boat, there are two on each side under the block and one (steering I think) in the front close to you halfway down to your left. They are blue plastic screw pins that are hand tightened. I drained them all and can still take the boat out if we get some warm days in December.

    Oil/filter change and stabilizer in the fuel - call it good for the winter. Will service the lower unit in spring when I take it off the lift at the dock.

    Nate,
    Nashville, TN

  8. #8

    Default Re: How many drain plugs on a 4.3 v6 merc

    Quote Originally Posted by dalton565 View Post
    Would like to get it sorted before the cold weather. its an 05 mercruiser 4.3 s/n ow325312
    I have the same engine, 2005 4.3L MCM, s/n ow324734. At least, I think it's the same; the s/n is very close.
    If so, you have 5. The thermostat housing on the front of the engine has a c-shaped hose on the left (side with the fuel filter). At the base, there should be another blue plug. You have to squeeze your hand alongside the serpentine belts to get to it.
    If you happen to not have one, unclamp the hose to get the water out.

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