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1962 Johnson Shift Shaft Seal Replacement

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  • 1962 Johnson Shift Shaft Seal Replacement

    Trying to reseal the lower unit of a 1962 40HP Johnson. The book says that there is a bushing an O-ring and a gasket sealing the shift shaft. How do you get those suckers out? Any tricks or tips would be appreciated? Also, any tricks for removing the drive shaft seal from the top of the unit as well. Looks like it is a pressed in piece.
    1974 Crestliner Noresman
    1963 Starcraft Jupiter
    1961 Crestliner Explorer "17"
    http://1974norseman.blogspot.com/
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  • #2
    Re: 1962 Johnson Shift Shaft Seal Replacement

    You need a special punch like the one shown to remove the bushing. It has the same diameter as the shift rod, with a shoulder on it. Obvously you have to open the gearcase. Some come out from the top, some from the bottom. A standard seal puller with a hooked end (about $10 at an auto parts store) is used to remove the driveshaft seal.
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    • #3
      Re: 1962 Johnson Shift Shaft Seal Replacement

      PM iboats member F_R, he can help you out.

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      • #4
        Re: 1962 Johnson Shift Shaft Seal Replacement

        Yeah, you need to buy/make/devise a punch of some sort. I've used an old spade bit and socket extender before, but there are all kinds of tricks. Here's a link that may help.

        http://forums.iboats.com/showthread....t+installation

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        • #5
          Re: 1962 Johnson Shift Shaft Seal Replacement

          For the shift shaft you can always tap about 3 threads into the brass bushing and then screw in a bolt. You can then either punch it out by hammering a rod that is put up against the bottom of that bolt (my preferred method) or simply pull on the bolt head.

          The drive shaft seal is best pulled with a seal puller. Here is a video on how it is done.

          http://www.youtube.com/watch?v=Wu6BgXYxefs

          In either case you will probably need to dissassemble the lower unit and then seal it all back up again. Might as well change the prop seal while you are at it.

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          • #6
            Re: 1962 Johnson Shift Shaft Seal Replacement

            And the water pump.

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            • #7
              Re: 1962 Johnson Shift Shaft Seal Replacement

              And the water pump?? Yes I am replacing the rotor. Do I need to replace other parts of the pump assembly.
              1974 Crestliner Noresman
              1963 Starcraft Jupiter
              1961 Crestliner Explorer "17"
              http://1974norseman.blogspot.com/
              http://1961crestlinerexplorer.blogspot.com/
              Heartland Classics on Facebook

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              • #8
                Re: 1962 Johnson Shift Shaft Seal Replacement

                Depends on how bad they look. Only you can make that decision.

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                • #9
                  Re: 1962 Johnson Shift Shaft Seal Replacement

                  Wondering what I am doing wrong. From looking at the lower unit, it appears that my bushing goes out the bottom. Measured out my spade bit and sure enough it looked at it should work. I put it in from the top and drove and drove and rove. Nothing !!! I have since ruined the bit, and the bushing is still stuck in place. So, any additional ideas on how to get the bushing out? I am thinking of tapping it at this point to see if I can pull it out.
                  1974 Crestliner Noresman
                  1963 Starcraft Jupiter
                  1961 Crestliner Explorer "17"
                  http://1974norseman.blogspot.com/
                  http://1961crestlinerexplorer.blogspot.com/
                  Heartland Classics on Facebook

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                  • #10
                    Re: 1962 Johnson Shift Shaft Seal Replacement

                    I've done that trick before and it works. Tap it out, put a long bolt in it with vice grips attached and beat on the vice grips in the up position. Of course you'll need a new bushing. The new bushing and seals are installed from the top.

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                    • #11
                      Re: 1962 Johnson Shift Shaft Seal Replacement

                      as you discovered, it drives from the bottom out the top..on the reinstall, once you get close to the spot the old bushing came to, grease the lower shift rod and insert it to get a feel for the tightness the new oring < fat rubber seal > brings, then make small adjustments in driving the bushing in further if necessary, it'll become really difficult to move the shift rod if you drive the bushing in too far

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                      • #12
                        Re: 1962 Johnson Shift Shaft Seal Replacement

                        Don't be gentle - sometimes it takes some pretty good "raps" with a hammer to pound it out.

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                        • #13
                          Re: 1962 Johnson Shift Shaft Seal Replacement

                          Well I got the tool from F_R. Great looking tool. I insert it in the top of lower unit. It felt like it dropped into a certain point. Looked at it from the gear side case and the tool looked like it was in the right place, so I flipped it back over and started hitting the tool. Well I hit the tool so hard I drove it right through the bottom of the unit. After I got the tool out the bushing really did not look like it had moved at all. So at this point, I am thinking of trying to machine this thing out. What I would like to confirm at this point is the bushing on the gear case side or the water pump side. My parts manual clearly indicates that it comes in from the top, but I don't see anything that looks like a bushing from the top. The hole is just barely smaller than the surrounding casting. When I look at it from the gear case side I see what appears to be a bushing. So I think I can machine it from gear case side.
                          1974 Crestliner Noresman
                          1963 Starcraft Jupiter
                          1961 Crestliner Explorer "17"
                          http://1974norseman.blogspot.com/
                          http://1961crestlinerexplorer.blogspot.com/
                          Heartland Classics on Facebook

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                          • #14
                            Re: 1962 Johnson Shift Shaft Seal Replacement

                            k..to get on the same page..*****************..1962 40 hp. RD-24 Gearcase Group...parts 19,20,21..bushing, gasket,seal < fat oring >..they do insert from the top, so you would drive them out from the bottom to the top...F_R's tool allows this as well as the reuse of the bushing...those parts "rest" on an inner lip within that casting...in trying to drive the bushing from the top out the bottom have you destroyed this lip?...is the brass bushing driven significantly below the surface of the casting?

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                            • #15
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                              Re: 1962 Johnson Shift Shaft Seal Replacement

                              Ok will try from bottom. Hope nothing destroyed
                              1974 Crestliner Noresman
                              1963 Starcraft Jupiter
                              1961 Crestliner Explorer "17"
                              http://1974norseman.blogspot.com/
                              http://1961crestlinerexplorer.blogspot.com/
                              Heartland Classics on Facebook

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