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lower unit small hole

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  • lower unit small hole

    hi there I replace my lower unit because was crack, I replace the water pump on my new lower unit and the question is in the lower unit at the front of the housing is a small hole, before I never see water coming out of that small hole is that normal and what is that hole for? thanks

  • #2
    Re: lower unit small hole

    I assume you are referring to a Mercruiser... The small hole low on the front of the lower unit is a drain, nothing more. The reason your old unit cracked, was because that drain was blocked and allowed salt/ali corrosion to 'grow' inside the cavity.

    Chris..........
    xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
    The world takes on a whole new perspective when viewed from 100 below.
    1972 Bertram Bahia Mar 20
    2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
    (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


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    • #3
      Re: lower unit small hole

      and it looks like this when on the hose...



      next time ya go after your impeller. clean this cavity out. both the used drive i have gotten have had this cavity plum full of sand and other stuff. very hard pack.... i used a long screwdriver + a small hose attatched to my vacum cleaner.... a small wire thru the hole after ya clean it out....
      'Lime Time'
      1975 AristoCraft Nineteen
      Mercruiser 165hp (chevy 250 L6), MC-1 drive

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      • #4
        Re: lower unit small hole

        hi there thanks crack because I hit a rock but the problem is that I replace the water pump and when I turn the motor with the hose I have water coming out of that hole is that normal?

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        • #5
          Re: lower unit small hole

          Normal and a good thing... it shows the drain cavity is clear....
          xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
          The world takes on a whole new perspective when viewed from 100 below.
          1972 Bertram Bahia Mar 20
          2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
          (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


          Comment


          • #6
            Re: lower unit small hole

            by the way I forget to put back 1 of the screws on the water pump that will cause problems right?

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            • #7
              Re: lower unit small hole

              i has only has 4. i wouldn't be happy knowing there were only 3.... this is the sorce of where the water comes from to cool your engine.... i'd go put it back if it were me.... use proper torque values on the bolts... next time, i would guess you won't forget that screw....
              'Lime Time'
              1975 AristoCraft Nineteen
              Mercruiser 165hp (chevy 250 L6), MC-1 drive

              Comment


              • #8
                Re: lower unit small hole

                yes I see is 4 I only put back the 3 and start the motor with the hose and was overheating a little bit.

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                • #9
                  Re: lower unit small hole

                  Ayuh,.....

                  You just Can't leave out pieces,+ expect anything to Last.....

                  You can either Fix it Now,...
                  Or you'll be Fixing it Later,....
                  And probably alot more than Just a Screw if you wait for Later.....

                  Comment


                  • #10
                    Re: lower unit small hole

                    hi there the screw that i forget is in the fig #7

                    http://www.iboats.com/mall/image/view/2/7/594b_2.jpg

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                    • #11
                      Re: lower unit small hole

                      It doesn't matter one bit which one you forgot. It needs to be fixed before you take it out on the water.
                      It's just that simple.
                      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.

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                      • #12
                        Sign up today
                        Re: lower unit small hole

                        hey thanks to everybody for the help tomorrow Im going to take it apart I will take some pics and see how will work thanks.

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