Results 1 to 10 of 10
  1. #1
    Member
    Join Date
    Feb 2014
    Location
    Illinois
    Posts
    214

    Water in LU....again

    1B506554
    2008 Mercury Pro XS 225
    Does anyone else have these issues of water constantly getting into the LU? Just checked it, found milky oil again. This is the third time in two years. Last time I brought it in, the mechanic said it was the prop shaft seal leaking at higher pressures doing the pressure test. Is there another spot that it could be failing at again? Itís quite irritating when I only put on average 10-15 hours per year on the motor. Have to bring it back to the mechanic for an injector wire issue, anything I should ask him to check with the LU when I bring it in?

  2.  
  3. Member
    Join Date
    Nov 2016
    Location
    Birmingham AL (Pelham)
    Posts
    1,304
    #2
    Two seals on top, one around the shift shaft, one around the drive shaft. Either can leak, although for me, the shift shaft has been the one that leaked first, between the two. The prop shaft seal is more exposed and suffers when fishing line gets wrapped around the prop shaft.

    Should check the obvious first with a pressure test. Verify no prop shaft runout. First find what is leaking, then fix it. I personally replace all of those seals if I replace any of them. Done correctly, leaks won't happen (assuming you don't have a hidden crack in your gear case, which is not very common.)
    2008 Bass Cat Pantera Classic
    2014 Mercury Pro XS 200

  4. Member
    Join Date
    Feb 2014
    Location
    Illinois
    Posts
    214
    #3
    Just received a call from the mechanic. He stated it’s possible something broke off from a diverter and is causing the prop shaft seals to wear out. He said he remembered reading about it a while back, and it would be a very long and costly job to fix it. Does this sound right? Causing the prop shaft seal to wear out? He is pressure testing it right now to see, and is resealing it all, but I just want to be prepared for a bad news phone call.

  5. Member
    Join Date
    Jul 2004
    Location
    Penn PA
    Posts
    12,968
    #4
    I have no idea what he is talking about....."diverter is causing prop shaft seals to wear out"


    Don't take others for granted, show appreciation, especially for those willing to help daily, without a financial gain.
    "Congratulations you just made the List" Help will always be offered to those NOT on the list.

  6. Member
    Join Date
    Feb 2014
    Location
    Illinois
    Posts
    214
    #5
    He made it sound as if it was possible a piece broke off inside the engine and could’ve been burning out the prop shaft seals, which would require the power head needed to be taken off, turning it into a massive job. My hope at this point is just bad seals, and worst case scenario being a bad prop shaft. Sorry I can’t be more clear as I was confused about the diverter as well. I’m hoping to find out more tomorrow.

  7. Member
    Join Date
    Jul 2004
    Location
    Penn PA
    Posts
    12,968
    #6
    "Wearing out" and "burning out" (overheated, melting) are two totally different scenarios. I know what he's talking about now. If the seals are melting due to temperature, then yes the powerhead needs pulled to check the strainer.


    Don't take others for granted, show appreciation, especially for those willing to help daily, without a financial gain.
    "Congratulations you just made the List" Help will always be offered to those NOT on the list.

  8. Member
    Join Date
    Jun 2013
    Location
    LONGVIEW TEXAS
    Posts
    5,865
    #7
    well it aint bad seals ,and dout its propshaft, could be poppet valve, you got a hyd jack plate ????? watch that water psi super heated exhaust will burn up p/s seals =engine too high
    where the grass is green and the girls are pretty And remember falling feels like flying till you hit the ground

  9. Member
    Join Date
    Feb 2014
    Location
    Illinois
    Posts
    214
    #8
    No, it’s not a hydraulic jack plate. I get about 20 psi at WOT

  10. Member haus9393's Avatar
    Join Date
    Mar 2013
    Location
    Plattsburgh, NY
    Posts
    3,302
    #9
    I had my seals done around 540 hours. 2 months later and 100 hours I changed the oil again to find it was full of water. The thing was still running perfectly fine. Since it was under factory warranty I ended up getting a brand new lower unit no questions asked. So to answer your question yes they can keep leaking over and over. Might be the lower unit. Might be the tech doing the work. Either way I’m extremely pleased how my situation ended up because mine was a ticking time bomb. Can only imagine how those bearings are doing after being lubed with water for hours on end.

    2015 Ford F150 XLT Super Crew 2.7L Ecoboost FX4 302a
    2016 Phoenix 721/ Mercury 250 ProXS
    DUAL HDS16s Console/ HDS12-Solix12 Bow 360
    Dual 10' Blades/ 112 Ultrex/ Bobs Hydraulic Plate/ Leash
    My Youtube Channel: Boat Flippin' Productions https://www.youtube.com/channel/UC-d...WxrxIutZQ/feed

  11. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
    Join Date
    Apr 2008
    Location
    Greenville, SC (US)
    Posts
    78,178
    #10
    Could also be the person filling the gearcase. OVER-FILLING the gearcase can result in venting, seal failure, or water in lube.


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 42 years (learn something new every day).
    Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor