Hole in Engine

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  • Dsand
    • Apr 2026
    • 4

    • MN

    • 2004 SV211

    #1

    Hole in Engine

    Hello all. I am a first time Natique owner with a 2004 SV211 (had an older mastercraft a few years ago) and found a brass plug in a cup holder which sent me on a search for where it went. I subsequently contacted the seller who told me it was an "extra" that he had bought last year. However during my search I found a threaded hole that seems like it should have something in it and I was hoping for your expertise (no local dealers with expertise near me). When I ran it there was no leaking and it ran great but it does seem like something was in there.

    Hopefully you can see from the pictures, but it is on the starboard side of the engine and behind and above the oil pressure sending unit and the T that goes in the block there. Thanks for your help and I hope this isn't going to cause me problems with my new (old) boat! Click image for larger version  Name:	PXL_20260418_133716563.jpg Views:	12 Size:	182.3 KB ID:	690028 Click image for larger version  Name:	PXL_20260418_133724205.jpg Views:	12 Size:	141.0 KB ID:	690029
    Attached Files
  • SilentSeven
    1,000 Post Club Member
    • Feb 2014
    • 2157

    • Bellevue WA

    • 2004 Nautique 206

    #2
    Looks like an unused factory mounting point in the block.

    99% sure your right side block drain is what I've circled here. You'll know right away if you are missing any engine drain plugs when you run the engine as you see water building quickly in the bilge.

    Click image for larger version

Name:	PXL_20260418_133716563.jpg
Views:	77
Size:	176.8 KB
ID:	690032
    Attached Files
    2004 206 Air Nautique Limited - Black with Vapor Blue (family style)
    1997 Masters Edition Nautique - Zephyr Green - gone (amazing ski wake)
    1982 Mastercraft Powerslot - gone (a primitive but wonderful beast)
    Bellevue WA

    Comment

    • bturner
      1,000 Post Club Member
      • Jun 2019
      • 1732

      • MI

      • 2016 200 Sport Nautique

      #3
      Kind of surprised there's no knock sensor on the drain plugs if this is a 2004.

      Comment

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