Bravo 3 Gear Lube Reservoir Leaking?

rmrstlmormrstlmo Posts: 103Member ✭✭

It appears that my gear lube reservoir is leaking.  I have gear lube on the side of engine and in the bilge. I put a real metal clamp on the hose and I'm still getting quite a bit of oil leaking out.  The reservoir will drain after about an hour of running.  Anyone else had this problem?  Any thoughts on what else it could be?  Thanks for you help.

It item 27 in the link below:

https://www.mercruiserparts.com/Show_Pictures3.asp?dnbr=809808 96&ivar=images/COMMON/18730.png&inbr=1943&bnbr=330&bdesc=OIL+RESERVOIR+COMPONENTS

Ray

2000 340 FV

Comments

  • Black_DiamondBlack_Diamond Holland, MichiganPosts: 2,547Member ✭✭✭✭✭
    Is it leaking from the reservoir or overflowing from the top? The latter is likely from the drive overheating. Watch over clamping the tube as it's just plastic you are squeezing.

    2003 342FV "Black Diamond", PC BYC, Holland, MI
  • BoatAwayBoatAway DCPosts: 179Member ✭✭✭

    your "on the side of the engine" comment is thought provoking... is it leaking from the hose? have you seen it leak/drip or do you just notice the level go down? It could be that the resevoir is cracked. which happens often..

  • rinker312rinker312 Lake Wheeler, ALPosts: 255Member ✭✭

    one time when I took my reservoirs off to clean I remember having the barb assembly on the bottom come loose, but couldn't get it tight without reaching into the bottle with needle nose or something and holding the float assembly in place, then I was able to get the bottom tight. 

    basically the lube bottle connects to the hose and then runs to another connector at the transom.  I don't think there are any connectors in between.  I would try to wipe down all the oil and locate the leak.  Good Luck.

    2004 Rinker 312, 5.0 Merc's, Bravo III, Lake Wheeler, AL

  • BabyboomerBabyboomer Louisville KyPosts: 916Member, Moderator ✭✭✭✭
    image

    Slip 866 Sunset Marina Byrdstown Tn
  • bat32bat32 Posts: 161Member ✭✭✭
    I had this problem before I put the drive showers on my Bravo III.  They tend to overheat when up on plane for a while.  It would literally boil out of the vent in the top of the cap. I barely ever run at WOT and still had the problem.  I usually cruise at about 3200-3500 RPM. 

     

  • rmrstlmormrstlmo Posts: 103Member ✭✭

    I've wiped it clean a couple of times and when I check it there is quite a bit of oil on the back side of the resevoir, down the side of the engine, and running down to the bilge.

    I'll do some more investigating this weekend.  I never thought about it coming out the top.  Is there any other way of knowing that the drive is over heating?

    Ray

    2000 340 FV

  • bat32bat32 Posts: 161Member ✭✭✭
    If you can pull the boat and look at the drives you will see a white chalking at the top of the drive.

     

  • rmrstlmormrstlmo Posts: 103Member ✭✭
    I believe there might have been some white-ish tint of the lube.  That must be a bad sign?

    Ray

    2000 340 FV

  • trich11trich11 Posts: 108Member ✭✭✭
    Any "milky" tint to gear lube usually indicates water in the drives. That is something you need to address quickly.
  • SpeedracerSpeedracer Lake St. ClairPosts: 29Member ✭✭
    Are you sure that the thru transom fitting is not cracked?  I believe it is #6 on the above diagram.  I had this problem with my 272 Captiva a couple of years ago
  • 212rowboat212rowboat Posts: 1,376Member ✭✭✭✭
    Looking at the various diagrams and schematics, it appears to me that these drives are not dissimilar to differentials on a vehicle, in that the lube is 'splashed' and shouldn't be under any real pressure. 

    Where does it vent? Is the vent obstructed?

    I agree with the above comments, fwiw, in that the lube shouldn't have ANY whitish appearance unless water has been introduced.. that isn't good.. it would be a straight up milkshake if there was a lot, though.. was there a chance the drive was overfilled? Is there a chance it was the wrong viscosity of lube creating over expansion (boiling)? And- how does the drive unit valve between the unit and the reservoir? If whatever valve mechanism isn't valving, it could perpetually overfill the drive, which means it has to vent somewhere..
  • 212rowboat212rowboat Posts: 1,376Member ✭✭✭✭
    I just read elsewhere that the only check valve is in the reservoir cap.... huh... it may be you might want to look that diaphragm over and see if it's damaged or stuck... it certainly sounds to me like you have pressure in that system that is causing leaking when it finds somewhere else to relieve itself.. 
  • macgyvermacgyver Posts: 3Member
    I have Alpha's not Bravo's but the reservoir and cap are no doubt similar. My port reservoir was leaking, I switched the port and starboard caps, expecting possibly the leak to switch, but the leak stopped. Inspected caps, and found the port cap had been over tightened at some point, caused gasket to deform. Slight differences in reservoirs made port cap fit better on starboard reservoir.  Fixed gasket. Just another item to inspect.
  • Black_DiamondBlack_Diamond Holland, MichiganPosts: 2,547Member ✭✭✭✭✭
    @Drew, at least on the bravo III, and highly likely the other Bravo / Alpha drives are the same, you cannot over fill them, expansion of gear lube fluid is minimal when there is little air in the system and that will bubble out eventually through the reservoir bottle.  Overheating to the point you exceed the limits of the oil is another matter..and of course getting water in the oil means you have other bad problems.

    2003 342FV "Black Diamond", PC BYC, Holland, MI
  • 212rowboat212rowboat Posts: 1,376Member ✭✭✭✭
    aye... gotcha.. it's pressure building that is of concern, and reason I mentioned it..
  • rmrstlmormrstlmo Posts: 103Member ✭✭
    I'll be on the boat tomorrow.  I plan on cleaning it up, refilling and i'lll try switching the caps to see if the leak goes to the other side.  I'll also see how warn the drive feels after running a little while.  Thanks for all the suggestions.

    Ray

    2000 340 FV

  • bat32bat32 Posts: 161Member ✭✭✭
    edited June 2013
    Yeah if the oil is white that is totally different.  The chaulking I talking about is actually on the top of the outdrive.  Ther was an extensive post on this on the last site.  But don't feel bad if it is boil over.  The Bravo III's are prone to this.  A hundred dollar pair of drive showers helped mine.  It was so popular on the last site they would do group purchases of them to get a better price.
    Post edited by bat32 on

     

  • rmrstlmormrstlmo Posts: 103Member ✭✭
    The O ring in the cap was missing. Nice to have cheap fix once in a while. Thanks for everyone's help. This forum is fantastic!

    Ray

    2000 340 FV

  • bat32bat32 Posts: 161Member ✭✭✭
    Whew.... Good to hear!

     

  • BabyboomerBabyboomer Louisville KyPosts: 916Member, Moderator ✭✭✭✭
    Good 

    Slip 866 Sunset Marina Byrdstown Tn
  • Dream_InnDream_Inn Annapolis, MDPosts: 1,775Member, Moderator ✭✭✭✭
    rmrstlmo said:
    The O ring in the cap was missing. Nice to have cheap fix once in a while. Thanks for everyone's help. This forum is fantastic!
    I had the same thing happen to me at the beginning of this year.  Glad you found the problem and it was an easy fix!

    Dream 'Inn III -- 2008 400 Express

  • raybo3raybo3 Revere MAPosts: 1,569Moderator ✭✭✭✭
    Aways nice to have a nice cheap and easy fix........ =D>
    2002 342 Fiesta Vee PC POPYC Revere MA.
  • craigswardmtbcraigswardmtb Mystic, CTPosts: 299Member ✭✭✭
    I think I have the same issue. Time to switch caps and see what happens.
  • rmrstlmormrstlmo Posts: 103Member ✭✭
    I was able to tell immediately by inspecting both caps side by side. Good luck.

    Ray

    2000 340 FV

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