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Procedure for changing trim oil

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  • Procedure for changing trim oil

    What is the procedure for changing the trim oil on a 72 Merc 120, with the black large body pump. I looked all throught the manual and can only find the bleeding procedure.
    Thanks Glen
    Glen
    2012 SOTY Winner"
    current restor 1976 Hoilday 18
    1986 Starcraft SS201 current rebuild (Complete) "SOLD
    http://forums.iboats.com/showthread.php?t=543074
    My 79 18 SS rebuild http://forums.iboats.com/showthread....hlight=dozerii "SOLD"


  • #2
    Re: Procedure for changing trim oil

    Remove the pin anchoring the trim cylinders to the rear of the drive. Disconnect all the trim hoses connected to the cylinders (4). Place a large pan under the cylinders where the lines are connected. Pull the ram out all the way and then push it back in all the way for each cylinder. This will remove all the oil from the cylinders. Then run the pump up and down until the pump and lines are empty. Follow instructions for filling and bleeding.

    CHECK THE RESERVOIR FREQUENTLY TO BE SURE YOU DON"T RUN IT EMPTY DURING BLEEDING!! It takes a lot to refill your cylinders when they are empty. Running it empty will get air in the lines. Don't be surprised it you have to refill it 4-5 times.
    sigpic
    23' Nordic Viking
    500HP BB Chevy
    TRS Drive

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    • #3
      Re: Procedure for changing trim oil

      To refill I use a lower end lube pump on a bottle of ATF.

      Less messy than a funnel.
      1980 Sylvan Aluminum 18' Sportster IO - Mercruiser 140
      1974 Glastron V-179, Mercruiser 140
      1984 16.5ft. Alumarine Sealark side console with 82 Merc 50
      Homeport - Lac du Bonnet, MB, Canada

      Comment



      • #4
        Re: Procedure for changing trim oil

        I have a volvo penta and got water in trim oil from leaking ram seal and I used oil change vacuum pump to empty the reservoir and re-filled and then cycled the trim system. Did this couple times until fluid stayed clear. Used cheapest ATF I could find for the intermediate "fills".

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        • #5
          Re: Procedure for changing trim oil

          Thanks for the replys, I will give the ideas a try. Marc c Lac Bu Bonnet many good memories from there, spent quite a few summers at a cabin across from Docs island. Learned to water ski and caught lots of nice pickeral there.
          Glen
          Glen
          2012 SOTY Winner"
          current restor 1976 Hoilday 18
          1986 Starcraft SS201 current rebuild (Complete) "SOLD
          http://forums.iboats.com/showthread.php?t=543074
          My 79 18 SS rebuild http://forums.iboats.com/showthread....hlight=dozerii "SOLD"

          Comment



          • #6
            Re: Procedure for changing trim oil

            Originally posted by dozerII View Post
            Thanks for the replys, I will give the ideas a try. Marc c Lac Bu Bonnet many good memories from there, spent quite a few summers at a cabin across from Docs island. Learned to water ski and caught lots of nice pickeral there.
            Glen
            Good luck. Where's Docs island?
            1980 Sylvan Aluminum 18' Sportster IO - Mercruiser 140
            1974 Glastron V-179, Mercruiser 140
            1984 16.5ft. Alumarine Sealark side console with 82 Merc 50
            Homeport - Lac du Bonnet, MB, Canada

            Comment



            • #7
              Re: Procedure for changing trim oil

              Changed my trim oil this morning, used a few ideas from everyone. I was shopping at Canadiantire the other day and they had a syringe for mixing small amounts of two stroke oil and it worked perfectly. I disconnected the back ends of the cylinders and let them hang down, then sucked out the contents of the pump and then refilled it with clean 20/50. Cycled the trim up and down a couple times and sucked out the pump again anrefilled with clean oil. It works great now.
              Glen
              2012 SOTY Winner"
              current restor 1976 Hoilday 18
              1986 Starcraft SS201 current rebuild (Complete) "SOLD
              http://forums.iboats.com/showthread.php?t=543074
              My 79 18 SS rebuild http://forums.iboats.com/showthread....hlight=dozerii "SOLD"

              Comment

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