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Mercruiser outdrive: pump runs but won't lower

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  • Mercruiser outdrive: pump runs but won't lower

    I bought a 1988 Stingray with a 130 Mercruiser that had been sitting for a couple of years. The outdrive is up, but when I hit the switch to bring it down, the pump motor runs, but nothing happens. It has plenty of oil. Any ideas?

  • #2
    Re: Mercruiser outdrive: pump runs but won't lower

    You could start with a BIG friend leaning on the drive And if that does not work you can crack the lines open and see if you can blead out the air AND see if the pump is pumping or just makeing noiseThen you can read up here http://www.boatfix.com/merc/Servmanl/6/6C1R3.PDF tommays
    If a dirty bottom slows you down what do think it does to your BOAT

    1970 Cal 29 Sea Fever
    http://cal29seafever.blogspot.com/
    1981 J24 Tangent 2930
    http://s565.photobucket.com/albums/s...%20for%20sale/
    Tommays
    Northport Ny

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    • #3
      Re: Mercruiser outdrive: pump runs but won't lower

      You could start with a BIG friend leaning on the drive
      Ayuh,...........And,.... If Leaning Isn't Enough,..??....... Try Jumping..........Then Grease It..........

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      • #4
        Re: Mercruiser outdrive: pump runs but won't lower

        Thanks. That gives me a couple of things to try. The reference manual had some good ideas.

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        • #5
          Re: Mercruiser outdrive: pump runs but won't lower

          If it has good hydraulic pressure it is rebuild the sticky trim cylinder tyme!

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          • #6
            Re: Mercruiser outdrive: pump runs but won't lower

            When you crack the lines open the drive should come down on it's own.
            1980 Sylvan Aluminum 18' Sportster I/O - Mercruiser 140, Honda 7.5 Kicker, Bennett M120 Tabs
            1974 Glastron V-179, Mercruiser 140
            1984 16.5ft. Alumarine Sealark side console with 82 Merc 50
            Manitoba, Canada

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            • #7
              Re: Mercruiser outdrive: pump runs but won't lower

              Unless the cylinder end cap is sticky.

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              • #8
                Re: Mercruiser outdrive: pump runs but won't lower

                When I bought my boat (with an alpha 1) the outdrive was up and had been for quite awhile. Same symptom - pump ran, drive wouldn't come down. Ended up needing my large friend to jump up and down on the drive while using the down button. It worked!

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                • #9
                  Re: Mercruiser outdrive: pump runs but won't lower

                  like waldo said, odds are the rams are stuck in the caps. there is not much hydraulic pressure in the down cycle. its not supposed to be needed.
                  no tech questions by PM, they wont get answered.
                  you have to be trusted by the people that you lie to .

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                  • #10
                    Re: Mercruiser outdrive: pump runs but won't lower

                    Well, I disconnected the lines, and the pump is pumping good to the cylinders. I jumped up and down on the outdrive while running the pump in the down setting, but still nothing happened. I used a block of wood and hammer against the end of the cylinders to break anything loose, and still nothing. Any suggestions? Is there anyway to manually lower the outdrive? Thanks.

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                    • #11
                      Re: Mercruiser outdrive: pump runs but won't lower

                      Did you remove the trailering clips?

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                      • #12
                        Re: Mercruiser outdrive: pump runs but won't lower

                        Where are the trailering clips? I looked for anything that might have been proping it up, but didn't see anything.

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                        • #13
                          Re: Mercruiser outdrive: pump runs but won't lower

                          I just double-checked. No clips.

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                          • #14
                            Re: Mercruiser outdrive: pump runs but won't lower

                            Try removing the rams from the outdrive and see if it is frozen "up." It should obviously drop down when the rams are removed.

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                            • #15
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                              Re: Mercruiser outdrive: pump runs but won't lower

                              Update: I removed both rams, and neither will move at all, even if I put clamps on them and tighten the clams. I talked to a hydraulic specialist (not a boat guy), and he said they're not supposed to be able to move without the pump. He said to check the pressure on the pump, but I understand the pump is supposed to be a 'low pressure' pump. Anyone know how to check out the pump? Thanks.

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