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F115 Maim trim piston replace

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  • F115 Maim trim piston replace

    Im a hobby garage setup mechanic. Is it possible for me to do this job?
    I also now I may need special tools to do this job. Ughhh.
    Anyone have experience doing this at home?

  • #2
    Do you mean "maiN" trim piston... as in the "tilt" piston? I'm in the process of doing it right now for my engine - can't imagine it's a whole lot different than yours. I have the entire T/T assembly in my vise and have disassembled the tilt piston assembly and pump. Have all the rebuild parts/seals I need - Gonna get to finishing it up as soon as I finish the bathroom remodel... carb rebuild on my dad's snowblower... fix a fuel vent issue on my old '97 528... you get the idea. Regardless, I wouldn't call it a "hard" job by any means. Just lot's of small parts that you need to take care of. Can't answer the question of whether "you" can do it - you know that answer better than me.
    2000 Yamaha OX66 250HP SX250TXRY 61AX103847T
    1982 Grady Weekender/Offshore (removed stern drive & modded to be an OB)

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    • #3
      the hardest part - and the only need for "special tool" -
      is removing/replacing the end cap
      (and if you don't want to buy one, its not that hard to 'make' a pin spanner)

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      • #4
        So then Ill need two different tools, one for the side pistons and the main.
        And Ill want to replace the pump itself because with my luck as soon as i put it back in, that will fail.
        Then the effort of getting it off the boat, I`m not sure.
        Everything is 18 yrs old never been replaced.

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        • #5
          The "side pistons" are the TRIM RAMS, the Center is the TILT RAM.

          Just a little easier communicating with others.
          Scott
          1997 Angler 204, Center Console powered by a 2006 Yamaha F150TXR

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          • #6
            Originally posted by DennisG01 View Post
            Do you mean "maiN" trim piston... as in the "tilt" piston? I'm in the process of doing it right now for my engine - can't imagine it's a whole lot different than yours. I have the entire T/T assembly in my vise and have disassembled the tilt piston assembly and pump. Have all the rebuild parts/seals I need - Gonna get to finishing it up as soon as I finish the bathroom remodel... carb rebuild on my dad's snowblower... fix a fuel vent issue on my old '97 528... you get the idea. Regardless, I wouldn't call it a "hard" job by any means. Just lot's of small parts that you need to take care of. Can't answer the question of whether "you" can do it - you know that answer better than me.
            Just exactly what is an old '97 528

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            • #7
              Originally posted by 99yam40 View Post

              Just exactly what is an old '97 528
              A BMW car.
              2000 Yamaha OX66 250HP SX250TXRY 61AX103847T
              1982 Grady Weekender/Offshore (removed stern drive & modded to be an OB)

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