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Thread: TRS oil reservoir vent

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    TRS oil reservoir vent

    Anyone had any issues with oil blowing out of the reservoir vent? The drive has been completely rebuilt a couple years ago. Could there be a need for a drive cooler to keep the oil temp down so it won't expand as much?
    Brian

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    strange,

    strange, I've never had that problem. How much are you putting in? I'm pretty sure it takes two quarts of type F trans fluid.
    I had KC Marine rebuild mine this winter and opted for their pretty slick "Gaitlin Gun" cooler. I'm not sure if you've seen the stocker, but it's just a single small piece of copper bent in a U.

    LINK: http://www.kcmarinetr.com/MercTrans-Oil-Cooler.aspx
    DUNESMAN

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    yep, happens to me too. Refilled the drive with fresh oil cause I thougt I have airbubbles inside, was ok for a while and now starts to do this again. No idea what to do... it is a Bravo 1

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    Quote Originally Posted by KerrLake View Post
    Anyone had any issues with oil blowing out of the reservoir vent? The drive has been completely rebuilt a couple years ago. Could there be a need for a drive cooler to keep the oil temp down so it won't expand as much?
    Brian
    Brian,
    That reservoir has quite a bit of room for expansion of the drive fluid to where it should not come out if it was not overfilled. I would drain some of your drive fluid to make sure water has not entered the drive. My TRS drives have never puked out fluid, and I don't run drive coolers. 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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    Quote Originally Posted by MOP View Post
    Your setup does not have a tranny cooler?
    Do you mean there is no drive cooler? The Merc Trans used with a TRS has a cooler and I'm pretty sure the Borg Warner has a cooler also.
    "1978" F-22; Turbo'd & Intercooled.

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    I too would check for overfill or water in there.

    ***Years ago for some reason, I pulled out the heat exchanger on the MERC II trans, just the simple copper loop and there was a pinhole on that tube that would have introduced water. I can't even remember why I took it out, I think I was just curious but I did catch it by coincidence before any problems happened. I think it pulls out by removing just two bolts, maybe four, can't remember. I'd check that too. Remember water is more dense than oil and you won't see it right off the bat.
    DUNESMAN

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    Quote Originally Posted by Rodger View Post
    Do you mean there is no drive cooler? The Merc Trans used with a TRS has a cooler and I'm pretty sure the Borg Warner has a cooler also.
    The MERC II trans absolutely has a "cooler" or heat exchanger, it's down low on the port side I believe.
    DUNESMAN

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    btw, you might want to call Casey at KC Marine, he's a TRS specialist and would gladly help out with any knowledge, he's a nice and helpful guy.
    DUNESMAN

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    Quote Originally Posted by pipnit View Post
    I too would check for overfill or water in there.
    *** just the simple copper loop and there was a pinhole on that tube that would have introduced water.

    I had the same issue and just soldered up the pinhole. That was over 23 years ago....still does not leak.
    "1978" F-22; Turbo'd & Intercooled.

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    Quote Originally Posted by pipnit View Post
    The MERC II trans absolutely has a "cooler" or heat exchanger, it's down low on the port side I believe.
    pretty sure mine is lower stb side
    Charter Member - WAFNC, SBBR, KWOSG
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    I deleted my prior post! Did hot fully read the first, the few TRS drives I worked on don't remember them puking oil. I did have a couple that cooked the tranny from the cooler being plugged. I would drain and refill carefully and see what happens, it like mentioned could just be a little over filled.
    No matter what your beliefs are "GOD BLESS AMERICA"

    Fully retired marine tech near 60 years in the biz.

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    The TRS dives with the Borg-Warner Velvet Drive Trans also has a large multi-tube heat exchanger style oil cooler.
    "BENCHSEAT 18" ~~YellowJacket~~ project owner~
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    Quote Originally Posted by BUIZILLA View Post
    pretty sure mine is lower stb side

    you sir, are correctomundo! Thanks!
    DUNESMAN

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    I think a couple of you are thinking it is tranny fluid. The trs has a drive oil reservoir mounted on the transom, mine is on the port side. Matt at TNT rebuilt the drive so I gave him a call. He said to check for water, which I already did, and also that sometimes the drives completey lose all air pockets which leaves no expansion room. He said to drain the drive to the full level at the top plug and refill the reservoir to the full mark on the dip stick and see what happens. I'll let you know if it works in case anyone else ever has this problem. He also said that drive showers are pretty much useless on the trs since they tend not to run as hot as the Bravos.
    Brian

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    Quote Originally Posted by KerrLake View Post
    I think a couple of you are thinking it is tranny fluid. The trs has a drive oil reservoir mounted on the transom, mine is on the port side. Matt at TNT rebuilt the drive so I gave him a call. He said to check for water, which I already did, and also that sometimes the drives completey lose all air pockets which leaves no expansion room. He said to drain the drive to the full level at the top plug and refill the reservoir to the full mark on the dip stick and see what happens. I'll let you know if it works in case anyone else ever has this problem. He also said that drive showers are pretty much useless on the trs since they tend not to run as hot as the Bravos.
    Brian
    Yes, my TRS drives don't even get hot enough to develop the typical mineralization deposits like many other drives. I find it hard to believe that the reservoir is not large enough to handle the slight expansion of the fluid. I actually thought the reservoir concept was there to allow the drive to be totally full of fluid - unlike the drives that must have an expansion area of air at the top or the fluid would puke past the seals as it got hot. Anyway, I will be curious what caused the puking in your case. I have to presume that this is a new development. 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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