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    Failing u-joints-gctid815767

    I have a Bravo III hooked to a 7.4 Mercruiser in a 2859

    My problem is the u-joints keep going out on it.

    I don't operate with the drive in the up position, the spline and shaft are lined up using the line up tool.

    I've had this problem for about 4 yrs now and I'm tired of pulling drive about every 100 hrs of operation and replacing u-joints.

    Does anyone have a hint of what my problem could be???

    Thanks

    Skeeter

    #2
    What are your symptoms? How do you know they're failing?
    Bryan
    1997 2858 7.4 B2
    1992 Hewescraft
    Puyallup, WA

    Comment


      #3
      "Castaway" post=815773 wrote:
      What are your symptoms? How do you know they're failing?
      Good question, are you getting howling during turns?
      Dave
      Edmonds, WA
      "THE FIX"
      '93 2556
      Carbureted 383 Vortec-Bravo II 2.0:1 18 1/4x19 P

      The rebuild of my 2556 https://www.baylinerownersclub.org/f...76?view=thread
      Misc. projects thread
      https://www.baylinerownersclub.org/f...56-gctid789773

      Comment


        #4
        When I turn over about 15-20' they make a klunking sound.

        When I pull the drive they don't look to bad but after installing new ones there is no noise from them.

        Comment


          #5
          A Marine Stern Drive universal shaft bearing cross should not be wearing out prematurely. Something is wrong, and let's see if we can find it!

          First off..... these must articulate or the needled bearings will "point load". This means that the bearing cap must turn back/forth on the trunion surface.

          The idea is that the articulation will keep the needle bearings constantly changing positions on the trunion surface.

          If they are not constantly changing positions, they will point load and will wear prematurely.

          These images may help you understand what the components are and perhaps help explain how they function.


          Attached files

          Rick E. Gresham, Oregon
          2850 Bounty Sedan Flybridge model
          Twin 280 HP 5.7's w/ Closed Cooling
          Volvo Penta DuoProp Drives
          Kohler 4 CZ Gen Set

          Comment


            #6
            Pretty easy to bend the drive yoke replacing the cross there, ask me how I know inch:

            Could be a possible cause for them wearing prematurely.
            Dave
            Edmonds, WA
            "THE FIX"
            '93 2556
            Carbureted 383 Vortec-Bravo II 2.0:1 18 1/4x19 P

            The rebuild of my 2556 https://www.baylinerownersclub.org/f...76?view=thread
            Misc. projects thread
            https://www.baylinerownersclub.org/f...56-gctid789773

            Comment

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