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  1. #1
    Rear Admiral dozerII's Avatar
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    Default 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/starcraft-boats/1986-ss-201-a-543074.html
    My 79 18 SS rebuild http://forums.iboats.com/showthread....hlight=dozerii "SOLD"

  2. #2
    Chief Petty Officer picklenjim's Avatar
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    Default 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.

    23' Nordic Viking
    500HP BB Chevy
    TRS Drive

  3. #3
    Lieutenant Junior Grade marc c's Avatar
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    Default 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.
    1974 Glastron V-179, Mercruiser 140
    1984 16.5ft. Alumarine Sealark side console with 82 Merc 50
    Homeport - Lac du Bonnet, MB, Canada
    I've used Fram oil filters in all my junk for 35 years-no problems

  4. #4
    Chief Petty Officer
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    Default 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".

  5. #5
    Rear Admiral dozerII's Avatar
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    Default 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"

  6. #6
    Lieutenant Junior Grade marc c's Avatar
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    Default Re: Procedure for changing trim oil

    Quote 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?
    1974 Glastron V-179, Mercruiser 140
    1984 16.5ft. Alumarine Sealark side console with 82 Merc 50
    Homeport - Lac du Bonnet, MB, Canada
    I've used Fram oil filters in all my junk for 35 years-no problems

  7. #7
    Rear Admiral dozerII's Avatar
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    Default 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"

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