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Nissan 15 hp lower unit removal

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  • Nissan 15 hp lower unit removal

    I need to pull my lower unit to replace the impeller. I've removed the four nuts and the shift linkage pins. The unit will not drop-- the back side is free but not the front. The parts diagram shows a stud possibly in the front but I can't find it. Anyone able to solve my mystery?!?!

  • #2
    First, we need your actual model.
    You only need to pull one pin from the cam rod.
    There are 4 studs; one for each nut.
    Odds are the drive shaft splines are stuck in the crank shaft. Wedges and patience will get it out.
    Don't replace just the impeller; do a complete wp kit; works better, and lasts longer.
    Paul
    Buffalo NY USA

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    • #3
      Plastic or wooden wedges and patience are needed to pull lower leg down. Grese lightly drive shaft splines when assembling back lower leg, next time will be much easier to remove than before.

      Happy Boating
      Sea Rider 320, 380 Sibs, 450 Rib, 2 Strokes Tohatsu 5,18 & 30 HP Proud Smokers

      Comment


      • #4
        It's a NS15D2. Mine doesn't have bolts. It just has four nuts and washers. I just found a small (5/16" maybe) bolt under the shift linkage. Problem is there is no way that I can find to remove it. The bolt head sits just under a lip in the lower unit and the secondary shift linkage rod is in the way. I will get a picture to show more detail.

        I actually bought the impeller, cup, plat and o-ring.

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        • #5
          I'm not sure what's going on. The system won't let me upload any photos. It told me they were too large, so I cropped them and made them under the 2 MB size. Not it's telling me they are larger than the 4 KB size or such. WTC?

          Comment


          • #6
            The hidden bolt

            Comment


            • #7
              That bolt is irrelevant. There are 4 nuts on 4 studs (and of course the shift linkage), and that is all.
              Click image for larger version

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              Paul
              Buffalo NY USA

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              • #8
                The bolt you are showing is for the stopper for the cam rod. Item 8 in the drawing.
                Click image for larger version

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                Paul
                Buffalo NY USA

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                • #9
                  Stud #26 is a question. I'm sure the small bolt is #8.

                  Comment


                  • #10
                    I missed what you said about #8. That's good to know. What can you tell me about #26? Is it just a "guide" stud?

                    Comment


                    • #11
                      26 is a rubber tube which has another large one inside it, drawing doesn't shows it, shift rod passes through it, keeps water from entering pan. Only need to remove upper pin from coupler.

                      Happy Boating
                      Sea Rider 320, 380 Sibs, 450 Rib, 2 Strokes Tohatsu 5,18 & 30 HP Proud Smokers

                      Comment


                      • #12
                        Not trying to beat a dead horse, but according to my repair manual #26 is a"stud bolt" I just have to be sure because I sure can afford a new motor.

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                        • #13
                          Here's what my manual says/shows.

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                          • #14
                            Sorry number 25 corresponds to post 8. Newer lower leg units are like this one, does not show part 26 whatsoever. It's as simple as removing upper coupler pin and 4 lower bolts and that's it..

                            Click image for larger version

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                            Assume that never before have stripped a lower leg, it that's so, your whole issue is a seizure between drive shaft (Yellow X)


                            Click image for larger version

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                            And Lower Crank Shaft (Red X)

                            Click image for larger version

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                            Insert a plastic or wooden wedge at both lateral sides of both mating surfaces and bang with a rubber mallet hammer each side gently till lower unit falls. Patience and good humor is key...

                            Happy Boating


                            Sea Rider 320, 380 Sibs, 450 Rib, 2 Strokes Tohatsu 5,18 & 30 HP Proud Smokers

                            Comment


                            • #15
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                              Ok and thanks. I'll just fight it loose with the wedges. As you can imagine, I didn't want to risk breaking something if there was the stud that I asked about.

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