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oil leak from pin hole on lower unit

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  • oil leak from pin hole on lower unit

    I have a NS55B (Nissan) outboard and it seems to be leaking oil out of a small hole on the bottom of the lower unit.. This is my first boat and I have only had it three weeks and want to get it on the water.. It has a drink coaster size puttle on the drive way..The oil is clear with a light yellow tent and smells like machine oil. Its coming from a pin hole that is recessed in the bottom left of the bottom unit. The hole belongs there but why is it leaking? How can I find a manual on my outboard? Nissan dosent have my motor listed on their web site...Thank you for any advice you can give..


  • #2
    Re: oil leak from pin hole on lower unit

    You have a bad seal in the lower unit. It just happens to be escaping through a drain hole. The owners manuals are available as a free download from www.nissanmarine.com.
    Elvin
    My answers are like Zen...It may not be the answer you want, but it is generally the answer you need.

    The 3 Rules:

    1) Look in your service manual first...Then ask me if it is correct.
    2) Understand that your desire to repair your engine does not mean that you have the ability to do so.
    3) If you are confused, take your engine into a dealer..Then let them be confused...At least, in theory, they sent someone to outboard 101.

    Comment



    • #3
      Re: oil leak from pin hole on lower unit

      I have looked all over nissanmarine's web site and they dont seem to have the manual for the NS55B.. At closer look at the hole it seems there might be a small dab of JB Wield on the pin hole..I guess the guy I got the boat from knew this..pluss when I spin the prop it has a slight wobble like the shaft (?) is bent..?..Is this bad? Will it hurt it? How can I fix it? Can you tell this is my first boat?

      Comment



      • #4
        Re: oil leak from pin hole on lower unit

        The 50 C, 55 B, 60 A and 70 A all have the same owners manual. If the shaft is bent it needs to be replaced.
        Elvin
        My answers are like Zen...It may not be the answer you want, but it is generally the answer you need.

        The 3 Rules:

        1) Look in your service manual first...Then ask me if it is correct.
        2) Understand that your desire to repair your engine does not mean that you have the ability to do so.
        3) If you are confused, take your engine into a dealer..Then let them be confused...At least, in theory, they sent someone to outboard 101.

        Comment



        • #5
          Re: oil leak from pin hole on lower unit

          Model Comment FileSize ApproximateDownload Time(at 28.8) NSF4A 1MB 5 min. NSF4A2 1.7MB 8 min. NSF4B 2.5MB 11 min. NSF5A 1MB 5 min. NSF5A2 1.7MB 8 min. NSF5B 2.5MB 11 min. NSF6A 1MB 5 min. NSF6A2 1.7MB 8 min. NSF6B 2.5MB 11 min. NSF8A 3.4MB 15 min. NSF8A3 3.8MB 16 min. NSF9.8A 3.4MB 15 min. NSF9.8A3 3.8MB 16 min. NSF9.9A 2.3MB 11 min. NSF9.9B 2.1MB 10 min. NSF9.9B2 2.4MB 11 min. NSF15A 2.3MB 11 min. NSF15B 2.1MB 10 min. NSF15B2 2.4MB 11 min. NSF18B 2.1MB 10 min. NSF18B2 2.4MB 11 min. NSF25A Carbureted Model 2.9MB 13 min. NSF25B EFI Model 3.7MB 16 min. NSF30A Carbureted Model 2.9MB 13 min. NSF30B EFI Model 3.7MB 16 min. TLDI MODELS Model Comment FileSize ApproximateDownload Time(at 28.8) NSD40A 1MB 5 min. NSD40B 1.7MB 8 min. NSD50A 1MB 5 min. NSD50B 1.7MB 8 min. NSD70A2 1MB 5 min. NSD70B 1.7MB 8 min. NSD90A 3.4MB 15 min. NSD90A2 3.4MB 15 min. NSD90B 2.3MB 11 min. 2-STROKE MODELS (Carbureted) Model Comment FileSize ApproximateDownload Time(at 28.8) NS2.5A 964K 4 min. NS3.5A2 Forward Only 964K 4 min. NS3.5B Forward/Neutral 973K 4 min. NS3.5B2 Forward/Neutral 964K 4 min. NS5B Internal Tank 955K 4 min. NS5BS External Tank 955K 4 min. NS8B 1.1MB 5 min. NS9.8B 1.1MB 5 min. NS9.9B 1MB 5 min. NS9.9C 1.2MB 5 min. NS9.9D2 2MB 10 min. NS15B 1.2MB 5 min. NS15C 1MB 5 min. NS15D2 2MB 10 min. NS18C 1.2MB 5 min. NS18D 1MB 5 min. NS18E2 2MB 10 min. NS25C 2.1MB 10 min. NS25C3 1.2MB 5 min. NS30A 2.1MB 10 min. NS30A4 1.2MB 5 min. NS40C 2-Cylinder 1.9MB 10 min. NS40D 3-Cylinder 1.5MB 7 min. NS40D2 3-Cylinder 5.6MB 25 min. NS50D 3-Cylinder 1.5MB 7 min. NS50D2 3-Cylinder 5.6MB 25 min. NS60B 3-Cylinder 2.5MB 12 min. NS60C 3-Cylinder 4.5MB 21 min. NS70B 3-Cylinder 2.5MB 12 min. NS70C 3-Cylinder 4.5MB 21 min. NS90A 4.5MB 21 min. NS120A2 4.5MB 21 min. NS140A2 4.5MB 21 min. there not listed..

          Comment



          • #6
            Re: oil leak from pin hole on lower unit

            sorry for the trouble...I took it out on the water yesterday and it ran great.exept I thought the motor sounded rough and kinda shakey at low speeds but I know nothing of boats..I feel kinda stupid, I stared at the depth gage the whole time..my lake is only at an advrage of 8ft right now from drought..

            Comment



            • #7
              Re: oil leak from pin hole on lower unit

              Looks like they stopped offering that manual. Contact them and they will direct you to someone who has them.
              Elvin
              My answers are like Zen...It may not be the answer you want, but it is generally the answer you need.

              The 3 Rules:

              1) Look in your service manual first...Then ask me if it is correct.
              2) Understand that your desire to repair your engine does not mean that you have the ability to do so.
              3) If you are confused, take your engine into a dealer..Then let them be confused...At least, in theory, they sent someone to outboard 101.

              Comment



              • #8
                Re: oil leak from pin hole on lower unit

                The Tohatsu website (same motor as the Nissan)does have a manual for the 50C / 60A / 70A2 (www.tohatsu.com) under the "technical info" section. The manual doesn't mention that it is for the 55hp model but if Elvin says it's the same, it must be true :-)

                Comment



                • #9
                  Re: oil leak from pin hole on lower unit

                  Elvin
                  My answers are like Zen...It may not be the answer you want, but it is generally the answer you need.

                  The 3 Rules:

                  1) Look in your service manual first...Then ask me if it is correct.
                  2) Understand that your desire to repair your engine does not mean that you have the ability to do so.
                  3) If you are confused, take your engine into a dealer..Then let them be confused...At least, in theory, they sent someone to outboard 101.

                  Comment

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