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90TLRA tilt cylinder piston removal

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  • 90TLRA tilt cylinder piston removal

    How do you take off the piston from the tilt shaft? I want to replace the oil seal in the cap and need to get the piston off.

    Do I need to remove the spring dowel and unthread the piston? Spring dowel visible in picture.
    Attached Files

  • #2
    lol that was my thought, too - but wrong. don't touch that roll pin.

    just unscrew the piston from the shaft - std right-hand thread

    Rodbolts' neat trick - hold top of shaft in vise, drop two 5/16" bolts/rods into a couple of the piston holes (from which you already carefully removed/contained the balls etc)
    then use a rod between the bolts for leverage to unscrew the piston


    see this thread:

    http://www.yamahaoutboardparts.com/f...d-th27537.html

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    • #3
      Thanks a lot for advice. Of course I lost one ball somewhere, aargh. Iím going to test with a slightly bigger ball ( 3 hundreds of 1mm bigger) to see if it works. Hope it does.

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      • #4
        Originally posted by holmen78 View Post
        Of course I lost one ball somewhere, aargh. Iím going to test with a slightly bigger ball ( 3 hundreds of 1mm bigger) to see if it works. Hope it does.
        Bummer. I nearly had to scrounge up a substitute - then got lucky when the lost ball "showed back up".

        but I felt confident that the valve design would be fairly tolerant of a difference in ball diameter.

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        • #5
          Yeah, I looked at the seat inside the piston where the ball is supposed to seal, and I can’t imagine a slightly bigger ball wouldn’t work. But I will search for an other hour for it, lol.

          It was an excellent thread that was linked in the first answer.

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          • #6
            nope
            you cannot randomly substitute check valves.
            wont work and you will take it back apart to install the correct parts.

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            • #7
              The bad thing is the valve balls are not sold separately and Iím not going to pay $500 for a new tilt piston sub assy just because one steel ball is missing. I have no choice but to try with the 0.0011811 inch (0.03mm) bigger ball and hope it seats. According to local Yamaha service dealer even a 4mm ball will work, so keeping my fingers crossed

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              • #8
                Originally posted by holmen78 View Post
                The bad thing is the valve balls are not sold separately and Iím not going to pay $500 for a new tilt piston sub assy just because one steel ball is missing. I have no choice but to try with the 0.0011811 inch (0.03mm) bigger ball and hope it seats. According to local Yamaha service dealer even a 4mm ball will work, so keeping my fingers crossed
                If a dealer says it, it must be true.

                I read this on the inner web.

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                • #9
                  I will let you all know how it works out once I have received all the spare parts and assembled the ptt back on.

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                  • #10
                    Got new ball bearing balls for my tilt piston. Replaced the one I lost with the new one and everything is working normally. They where 0.02mm bigger than original. Actually the new balls where rated as 5/32Ē in diameter.

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                    • #11
                      Thanks for the update.

                      You may have saved someone mucho $ down the road...

                      .
                      Scott
                      1997 Angler 204 CC, 2006 F150 TXR

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