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Cruise-O-Matic Overfill?

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  • Cruise-O-Matic Overfill?

    I'm curious because my transmission has stopped leaking from above where it rests on the cross member. About a year ago I followed directions and drained the transmission and both holes in the torque converter, then added 9 1/2 quarts before filling it to 10 after warming up the transmission.

    It leaked before and after servicing. Now it has stopped. Is this possible?

    Dean

  • #2
    Without knowing exactly where it was leaking it's hard to say. Normally transmissions leak because rubber parts get hard and no longer seal. Sometimes rubber parts will leak in the winter when it's cold and not in the summer when they soften up. If it leaked after you serviced it I suspect it will probably leak again at some point. The most common leak points are the front seal, pan and the shift selector seals. Sometimes it will also leak from the speedometer cable housing. It's usually pretty easy to determine exactly where it's leaking.

    John
    John Pizzi - Squarebirds Administrator

    Thunderbird Registry #36223
    jopizz@verizon.net 856-779-9695

    http://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htm

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    • #3
      Makes sense John. There goes my excitement. I know it's not the pan. The front seal should have been replaced when the transmission or torque converter were overhauled around 72K and she's almost 82K. Shift selector seals?

      Dean

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      • #4
        The shift selector seals are a very common leak point. They are on the driver side front of the transmission where the shift rods come out so they are easy to spot if they are leaking. If the trans was overhauled they should've been replaced.

        John
        John Pizzi - Squarebirds Administrator

        Thunderbird Registry #36223
        jopizz@verizon.net 856-779-9695

        http://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htm

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        • #5
          Dean:
          If it does turn out to be shift linkage seals, (a couple small o-rings) there is a procedure to change these out in the TRL. It's a bit of a PITA, but can be done without dropping the trans. I did it laying on my back and it worked well.
          You might try and use some brake clean to degrease the trans and then try to identify the leak source. With only 10K miles on a rebuild, you should still be in good shape.
          If the trans sat for a while, you might try some of the trans sealers. They basically are designed to cause the seals to swell. There will probably be a lot of kickback on this one, but I have had limited success using these.
          The trans also has a breather vent and you should make sure this somehow didn't get restricted.
          Nyles

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          • #6
            Originally posted by Tbird1044 View Post
            Dean:
            If it does turn out to be shift linkage seals, (a couple small o-rings) there is a procedure to change these out in the TRL...
            If the trans sat for a while, you might try some of the trans sealers. They basically are designed to cause the seals to swell. There will probably be a lot of kickback on this one, but I have had limited success using these.
            The trans also has a breather vent and you should make sure this somehow didn't get restricted.
            Nyles
            Thanks. You got me on this acronym. What is TRL? Transmission rebuild link? T-Bird Relic lesson? Transport Research Library?

            What is the down side of a sealer?

            Dean

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            • #7
              Cruise-O-Matic Overfill?

              The last guess is close, but no cigar! TRL stands for the Technical Resource Library (hence TRL!). There is a sub-Forum for it, or you can enter it by clicking on the link that both myself and John ~ jopizz have in our signature elements. There you will find the answers to many questions and tech tips regarding your Tbirds...

              Ray Clark - Squarebirds Administrator
              '59 Tbird "The Yellow Rose Of Texas" aka "Tweety Bird"
              "It's Hip To Be Square"
              Thunderbird Registry #33025 VTCI #11178

              Contact me via Private Message for my email address, or (Cell) 210-875-1411 (Home) 210-674-5781

              http://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htm

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              • #8
                Dean:
                The only downside I know of, if you add sealer, is that you spent a couple of bucks for the sealer and the trans keeps leaking. When my shift linkage seals were leaking, I tried some sealer and it really didn't help. The o-rings were beyond any help. As I said, I have seen success in some uses, so I figure it's worth a try.
                Nyles

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                • #9
                  I've used a good quality brand sealer on a Cruise-O with a minor leak and it's still holding after two years.

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                  • #10
                    Thanks everyone. I'll check my leak location (again), and check fluid level before I add any sealer to the case.

                    One last question: At what highest speed is the cruise-O-matic on this car still able to kick down into 2nd gear?

                    Dean

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                    • #11
                      Originally posted by Deanj View Post
                      Thanks everyone. I'll check my leak location (again), and check fluid level before I add any sealer to the case.

                      One last question: At what highest speed is the cruise-O-matic on this car still able to kick down into 2nd gear?

                      Dean
                      My '64 will kick down to second below 60, about. At lower speeds it will kick down two gears.

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                      • #12
                        Once again my Cruise-O-Matic is leaking and really good. It leaks from the passenger side right around the filler tube area, and I'd rather hear a possibility or two before hauling it back to the shop that replaced the transmission lines. I know they stuffed more fluid in the case.

                        Is it likely an overfill on the passenger side? or bogus connection on the lines?

                        Dean

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                        • #13
                          Is the trans leaking all the time or only when running and you have pressure on the lines?
                          If you paid to have the cooler lines replaced, I'd probably take it back, put it up on a hoist, clean the trans area with some brake clean and then check for leakage. First step in fixing the leak is to identify the source.
                          The reason I asked the first question, is I found a hairline crack in the dipstick tube that was leaking. If the shop tightens the tube, where it attaches to the pan, and then tweaks it a bit to secure the bracket to the rear of the engine, it can stress the tube causing a crack. Just a thought.
                          Nyles

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                          • #14
                            Nyles, it doesn't appear to be leaking under pressure. You're right about that. I've experienced leaking power steering lines under pressure, and they leak real good while the engine is running. This leaks a river while parked.

                            Shoot. Bringing it back to the shop is inevitable, and a pita.

                            Dean

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                            • #15
                              I would definitely look at the dip stick tube and also the connection to the pan.
                              Nyles

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