Gear lube reservoir empty...

Discussion in 'Gas Engines/Drives/Transmissions/Props' started by LUnaCY, May 15, 2019.

  1. LUnaCY

    LUnaCY Active Member

    206
    Aug 28, 2018
    Afton, MN
    310 Sundancer 2002
    Mercruiser 5.0 MPI Bravo III
    I think I know this answer, but let me have it.

    Mercruiser 5.0 MPI I/O

    I winterized, changed gear lube, filled reservoir. Idled 3 hes to new marina. Gear lube reservoir is empty.

    Im certain the plug is in.

    Complete lower?
     
  2. Little Ducky

    Little Ducky Well-Known Member

    Jun 5, 2017
    Dickson, TN / Chattanooga, TN
    1998 290 Sundancer
    Twin EFI 5.0L w/Alphas
    Kohler 4kW
    If you don't have an oil slick behind your boat it might have just been an air pocket that finally worked it's way out. Fill it up and see if it leaks out again.
     
  3. Espos4

    Espos4 Well-Known Member

    979
    Jan 1, 2017
    Long Island NY
    2007 240 Sundeck
    350 MAG Bravo 3 W/DTS
    Did you fill it from the bottom plug?

    Even when I fill mine, it drops a little after an hour or so and I have to top it off with a few ounces.

    You could just have a larger than normal air bubble that purged itself or a leak in the hose from the reservoir to the transom.

    I would expect a large oil stain in the water if you lost that much from a leaking seal.

    Top it off and check again.
     
  4. LUnaCY

    LUnaCY Active Member

    206
    Aug 28, 2018
    Afton, MN
    310 Sundancer 2002
    Mercruiser 5.0 MPI Bravo III
    Good. Ive got a chance! Fidgiting now. Topped off and will run in the slip.
     
    Little Ducky likes this.
  5. Little Ducky

    Little Ducky Well-Known Member

    Jun 5, 2017
    Dickson, TN / Chattanooga, TN
    1998 290 Sundancer
    Twin EFI 5.0L w/Alphas
    Kohler 4kW
    I've read where B3's like to puke the gear lube in the bilge as well...... so give it a good once over and see if you see any oil by the bellows.
     
  6. Espos4

    Espos4 Well-Known Member

    979
    Jan 1, 2017
    Long Island NY
    2007 240 Sundeck
    350 MAG Bravo 3 W/DTS
    Did you fill it from the bottom plug when you changed the oil?
     
  7. LUnaCY

    LUnaCY Active Member

    206
    Aug 28, 2018
    Afton, MN
    310 Sundancer 2002
    Mercruiser 5.0 MPI Bravo III
    I did fill it from the bottom, then cleaned and topped the reservoir. Mech was kind enough to chat with me a bit. Said dont sweat it and top it off. At worst keep topping it, but hes seen as much as 1.5 reservoirs burp out. Good to know. Its also nice tgat its no wake, I have 2 engines, and only plan on using a 10 mile stretch of tge river. Ill update as I find out.

    Thanks all! I was thinking it was a $5k morning.
     
    Little Ducky likes this.
  8. Jersey Mike

    Jersey Mike Member

    155
    Jun 27, 2008
    Barnegat Bay, NJ
    2001 290 Sundancer
    Twin 5.0L Bravo III
    I think $5k might have been a little short. Hope it all worked out
     
  9. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor

    Apr 21, 2009
    PA
    Various
    Various
    That part sounds like you filled it from the fill plug (bottom) till the oil showed up at the vent plug (top). THEN you stopped. Then you added oil into the reservoir. If that's true, as others were mentioning, that's the issue right there. When you fill a system that has a remote resevoir bottle, you CONTINUE filling till the oil shows up in the bottle. In your case, there was a lot of space still unfilled between the top of the drive and the tube/pathway to the bottle.
     
  10. SloBurn

    SloBurn Member

    803
    May 30, 2013
    Greenwood Lake, NY
    1994 270 Sundancer. 7.4L Merc. Tow with a 2006 Dodge RAM Hemi
    340 HP Merc 454 c.i.
    My BIII did the same thing. I just had it re-sealed for $600, not too bad. But they do "burp" when re-filling oil from the bottom plug. Usually 1/2 Liter or so.
     
  11. LUnaCY

    LUnaCY Active Member

    206
    Aug 28, 2018
    Afton, MN
    310 Sundancer 2002
    Mercruiser 5.0 MPI Bravo III
    This may be it. Only 1 engine had the issue...i cant remember if i waited until it came to the reservoir before i topped the reservoir. Anyway... i think im good.
     
  12. Whiskey Tango Foxtrot

    Whiskey Tango Foxtrot New Member

    11
    Mar 4, 2019
    Las Vegas, NV
    2003 Sundancer 280DA
    Twin 5.0 Mercruiser w/Bravo 3 Drives
    The burping has me troubled on mine too - I think the mechanic is bs'ing me! Am I wrong.... Had both drives pulled and sealed. $$$. After running for the weekend, I noticed the reservoirs were higher than when we started. They removed some fluid and said normal burp after major service. A burp should make it lower not higher in my mind! Am I wrong
     
  13. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor

    Apr 21, 2009
    PA
    Various
    Various
    Gear lube can heat up - especially in the Bravo III. Its not uncommon to see the fluid rise after some good runs. Or, it could be a bubble that is working it's way out, but hasn't yet gotten to the surface. A bubble would expand quite easily in size due to heating up, thereby raising the fluid level.

    What was it like after it cooled down and you checked it again?
     
  14. LUnaCY

    LUnaCY Active Member

    206
    Aug 28, 2018
    Afton, MN
    310 Sundancer 2002
    Mercruiser 5.0 MPI Bravo III
    Well, I topped the reservoir and have idled 4 more hours with minimal res fluid loss. Behind the boat there was a bit of a slick while drifting but not bad, and Im not sure it was even from my boat. Im comfortable idling around as its no wake everywhere in the river and will keep an eye on it.
     
  15. Whiskey Tango Foxtrot

    Whiskey Tango Foxtrot New Member

    11
    Mar 4, 2019
    Las Vegas, NV
    2003 Sundancer 280DA
    Twin 5.0 Mercruiser w/Bravo 3 Drives
    Fluid was still high and dark like it was hot. There was some water in fluid but mechanic said it is holding pressure fine so can't be the seals he did. Must be something else he doesn't have to warranty.
     
  16. JVM225

    JVM225 Well-Known Member GOLD Sponsor

    Apr 8, 2008
    Farmingdale, NY
    2002 410 Sundancer, Monaco Edition.
    3126 Cats.
    Water in the fluid? That can’t be a good thing..........
    If not a seal, then how else did it get in there? How good are those drain and vent plugs and their gaskets?
     

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