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  • Omc drain plugs

    Where are the water drain plugs on omc 120 hp with omc 400 sterndrive

  • #2
    bottom of intake manifold - probe port with a screw driver
    bottom of engine block, port side - probe port with a screw drive
    remove large hose and drain - may need a hose pic to remove hose.
    Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

    1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

    Past Boats
    1970 Wooster Hellion - Merc 9.8
    2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
    1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

    What’s behind you doesn’t matter.Enzo Ferrari

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    • #3
      Originally posted by C3KNIGHT View Post
      Where are the water drain plugs on omc 120 hp with omc 400 sterndrive
      Ayuh,..... Welcome Aboard,....... As Scott says,.....

      You'll find the manifold drain on it's bottom, 'bout center, or slightly aft of center,.....
      It'll either be a 1/8" pipe plug(7/16" wrench), or 1/4" pipe plug(9/16" wrench),......

      Just below it at the bottom of the block, just above the oil pan, is the block drain, a 1/4" pipe plug,.....

      'n pull the big hose off the circulatin' water pump on the front of the motor,.....
      It hides 'tween a pint to a quart of water,.....

      The drive,..?? Lower it,....

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      • #4
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        If you did a lot of boating in muddy shallow water, make sure the lower foot drain holes are clear.

        If the drain holes are not clear, you may have to pull the outdrive, and separate the halves to clean out the cavity
        Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

        1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

        Past Boats
        1970 Wooster Hellion - Merc 9.8
        2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
        1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

        What’s behind you doesn’t matter.Enzo Ferrari

        Comment

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