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Thread: TRS Power Trim goes down slowly after sitting

  1. #1
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    Angry TRS Power Trim goes down slowly after sitting

    Working on a 1979 Criterion for a friend. Just got done redoing the gimble ring, swivel shaft, ect... and am on to the next problem. The trim system operates fine once you cycle it a few times (have to have someone put pressure on the drive to initially get it to go down) So I assume air is getting into the system. The thing is that the drive will operate fine for months when left in regular operating positions, but if left trimmed all the way up for a week or so the problem re occurs. My initial thoughts are maybe a bad valve letting fluid to leak into the reservoir while the drive is up? I can't find any info online with this problem and am fairly baffled.
    Thanks for any advice or thoughts,
    -Alex

  2. #2
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    The solution for an Alpha, or Bravo, is the "UP" relief valve replacement.
    Your pump, if original, is pretty old and it might be time to replace w/a
    newer pump.
    While you're at it, drain and replace all the fluid.
    Also remove the cylinders and see if they'll operate on 100-125# air
    pressure, if not, time to change those too. This is important since there's
    also a relief valve inside the cylinder, so it may be leaking down internally.
    There're good prices for some new cylinders on the SEI site:
    http://www.sterndrive.cc/Mercruiser-...ydraulics.html
    There're more cylinders on the site, ya just have to dig around.
    George Carter
    Central Florida
    gcarter763@aol.com
    http://kineticocentralfl.com/


    “If you have to argue your science by using fraud, your science is not valid"
    Professor Ian Plimer, Adilaide and Melbourne Universities

  3. #3
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    I hate it when someone asks a question, you give them an answer, and they never respond.
    Is it just no respect?
    Maybe I should just not bother.
    George Carter
    Central Florida
    gcarter763@aol.com
    http://kineticocentralfl.com/


    “If you have to argue your science by using fraud, your science is not valid"
    Professor Ian Plimer, Adilaide and Melbourne Universities

  4. #4
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    I had a similar issue with my Alpha One dropping over time. I originally thought one of the valves in the trim pump was malfunctioning (we had just flushed it). Ultimately I found it was one of my trim cylinders leaking at the shaft seal. A little pi**ed as it was only 2 years old but, hey... this is boating. You couldn't even see the fluid until it had dripped onto concrete and made a mark. I traced the "dribble" to the seal and "voila"! Subsequently, I now use these snap over drive supports (pictured) to reduce the stress on the assembly while on the trailer. They're cheap and available at almost any marina. I got mine at West marine.
    Attached Images Attached Images
    Sean Conroy,
    1964 Formula Jr. (hull #2) project

    1972 Greavette Sunflash III
    1981 Kavalk Mistral project

    "A man can accomplish anything... as long as he doesn't care who gets the credit."

  5. #5
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    Quote Originally Posted by gcarter View Post
    I hate it when someone asks a question, you give them an answer, and they never respond.
    Is it just no respect?
    Maybe I should just not bother.
    I hear what you are saying George. I don't respond much any more due to this lack of responses. Anyway, I did want to add that when I had problems with the TRS drive not lowering without applying downwards force, I discovered that it was the seals in the rams. I am lucky having a local shop that specializes in repairing all types of hydraulic rams. They repaired a few TRS rams for me, but could not get some of them to unscrew due to corrosion. I have at least one ready to go repaired TRS ram and one brand new in the box TRS ram that I will eventually try to sell. Onwards, Bill

    1971 Donzi 18' 2+3
    1985 Eliminator 23' Daytona Offshore - Kevlar hull
    1988 23' Donzi CC F-23 with 250HP EFI Mercury OB
    1989 28' Team Warlock Offshore - single 548CID/600HP
    1990 23' Warlock Offshore - single 525HP
    Bill from Denison, TX - Lake Texoma

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