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No reverse 1994 Ski Nautique

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  • No reverse 1994 Ski Nautique

    Does anyone have any suggestions on reverse not engaging on a ski nautique with a PCM model 40 transmission? I have checked and added fluid (did not seem low or murky) Forward works fine, reverse does not engage at all. The linkage is functioning. When shifting, the lever rotates and the engine revs correctly, just no movement at the propeller. I am hoping for the best, but fearing the worst. Happened all of a sudden after working flawlessly during a two hour ride. Click image for larger version

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  • #2
    Im gonna take a look at the neutral safety switch before I get into it too far. Fingers crossed.


    Sent from my iPhone using Tapatalk

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    • #3
      Originally posted by Super Dave View Post
      Im gonna take a look at the neutral safety switch before I get into it too far. Fingers crossed.


      Sent from my iPhone using Tapatalk
      Based on it functioning in forward, Im going to assume that switch is working as it should.


      Sent from my iPhone using Tapatalk

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      • #4
        Pretty sure the NSS is only there to prevent starting in gear and really has no function for shifting.
        1998 SN GT40
        84 2001 Ski Nautique (sold)
        Monticello MN.

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        • #5
          Call Discount Inboard Marine.

          Sent from my SM-J337V using Tapatalk

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          • #6
            After some research on this site and others, it looks like I will need to remove the transmission and either rebuild or replace. The following links have been helpful in preparation for this job.

            SKIDIM- replacement parts and manuals
            https://www.skidim.com/products.asp?dept=1181

            MaksWerks Garage - DIY Step By Step Rebuilding a PCM 40i Boat Transmission
            https://youtu.be/zybPkIhVIMk?list=LL

            Removing transmission from similar boat [not the same transmission, but looks to be similar removal process]
            Velvet Drive Replacement PART 1
            https://youtu.be/0-JtXxHhyJM


            T
            here is a shortage on transmissions and the recommended replacement [PCM 80] is in short supply. My goal right now, is to remove the transmission and see if I can identify the problem, likely the clutches. If everything else looks good, I'll replace the clutches and see what happens. So far, I have prepped the area. Next step will be removing the exhaust.

            If anyone has suggestions, I would certainly be appreciative. I have never gotten this involved in any engine project and this is my first boat. Click image for larger version

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            • #7
              Use a hair dryer or heat gun to warm your hoses for removal, it helps a lot. Also some soapy water may help if you can get it between the hose and muffler. Be gentle around the fiberglass so you dont punch holes or crack it.
              1998 SN GT40
              84 2001 Ski Nautique (sold)
              Monticello MN.

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              • #8
                Well, never wanted to be posting a pic like this one, but we got the transmission out of the boat. I have it mostly broken down and have identified two possibilities for a loss in pressure in reverse. The clutches and everything internally looks perfect. Nothing obvious.

                First, when I got to the reverse piston, I noticed the o-ring was out of position on one side and preventing the piston from returning to the downward position. I am not positive that I didn't cause this problem on the bench when performing a function check. But this would explain the sudden loss in reverse function from an otherwise functioning tranny.

                Second, when I removed the control arm, I found the assembly to be extremely rust and debris filled. This could have lead to a blockage further down.

                Plan for now is to clean everything up, replace the seals and gaskets, and see what happens. Updates to follow. Great advise on the soap and heat gun from mpost above. Click image for larger version

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                • #9
                  That's a great rebuild video. Keeper!
                  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

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                  • #10
                    Update: after replacing all seals, reassembling the transmission, and reconnecting to the engine, I started the engine. Forward functioned flawlessly. Reverse worked initially. After putting into neutral and trying reverse again, it failed. Feels like no pressure again. At this point Im stuck. The clutches looked fine and all seals are new. The passages were blown out and free of obstruction.

                    I am thinking of just going ahead and buying a new transmission. Apparently the PCM 80 is the recommended replacement for a PCM 40. Presently, SKIDIM does not have any for sale. Any suggestions?

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                    • #11
                      Any dealer should be able to get a series 80 from PCM directly.
                      Current Boats > 2021 Super Air Nautique G23 (On Order) -- 2020 Super Air Nautique G23 -- 2003 Air Nautique 226 -- 1999 Air Tique 176 -- 1981 Fish Nautique (TWIN ENGINE 1 of 3)
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                      • #12
                        Oh man..not the news you want to share - how frustrating....
                        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

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