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  1. #1
    Join Date
    Nov 2009
    Location
    Bristol
    Posts
    561

    Default Stern Gland Leak - Again!

    When I bought the boat there was a pile of grease under the stern gland. So at the first opportunity I replaced the packing. Still leaked on prop rotation. A quarter turn on the grease gun would stop it but it would leak again on the next run. But not always. When it got bad I tightened the clamp a bit more - and added another wrap of packing tape. At one point I thought that the nuts were coming loose so I put stayloks on the clamping plate. No change.

    This year I had the boat out so and replaced the prop, cutless bearing and replaced the packing and the studs for the clamp. In doing so I noticed that the line of the prop shaft was a little above the line of the flexible connector so an engineer and I adjusted the engine to match and checked the flexible connector gap as suggested in this parish.

    It still leaks! After a lot of observation it seems that it is fine until the engine goes over about 2 200 revs. At this point the shaft appears to jump about a bit and the drips start. I can live with this but if it is something I could stop then I would.

    I can understand why my washing machine will start to jump about at various spin speeds and about fundamental harmonics but I would have thought that a modern Volvo engine would be properly balanced. The feet all seem to be secure and if I try to rock the engine it seems to be secure. It is about 13 years old but was not used for a good 5-8 years in that time. The previous owner always had it professionally serviced.

    Any thoughts? Thanks in advance

  2. #2
    Join Date
    Mar 2002
    Location
    Greenwich
    Posts
    7,477

    Default Re: Stern Gland Leak - Again!

    Could the prop shaft be bent at all?

  3. #3
    Join Date
    Aug 2005
    Location
    Brightlingsea, Essex
    Posts
    973

    Default Re: Stern Gland Leak - Again!

    Vibration at the cutlass bearing end of the shaft could be unbalance in the prop.

  4. #4
    Join Date
    Nov 2001
    Location
    scotland
    Posts
    3,422

    Default Re: Stern Gland Leak - Again!

    Do you have flex mounts
    flex coupling
    flex stern gland
    If yes to all three nothing to stop it all bouncing about

  5. #5
    Join Date
    Jan 2003
    Location
    Clyde
    Posts
    7,366

    Default Re: Stern Gland Leak - Again!

    I had trouble years ago with a leaking gland. It was caused by a worn shaft. As you push the engine harder the whole drive train moves forward a bit onto where the shaft meets the packing at the worn bit. As the engine is stopped it all moves back again to a point where an unworn bit of shaft is sealing against the packing rings. So no leak at low revs or stopped but when pushed the leak started. I replaced the shaft and packing and it's been fine since.

  6. #6
    Join Date
    Feb 2004
    Location
    Boat: Portsmouth, Us: Stewkley
    Posts
    3,012

    Default Re: Stern Gland Leak - Again!

    I replace our packed stern gland years ago. It was my understanding that they always leak? A drip every 10 seconds or so is considered normal.

  7. #7
    Join Date
    Dec 2001
    Location
    Grenoble
    Posts
    31,396

    Default Re: Stern Gland Leak - Again!

    Change the shaft, it is not expensive.

  8. #8
    Join Date
    Nov 2009
    Location
    Bristol
    Posts
    561

    Default Re: Stern Gland Leak - Again!

    We checked the shaft. It's fine. The prop is new; the suppliers checked the balance.

    Forgot to say that within 3 weeks of replacing the cutless bearing had some play but the leak (1-2 drops per second) occured even before it was worn.

  9. #9
    Join Date
    Jan 2003
    Location
    Clyde
    Posts
    7,366

    Default Re: Stern Gland Leak - Again!

    Quote Originally Posted by mattonthesea View Post
    We checked the shaft. It's fine. The prop is new; the suppliers checked the balance.

    Forgot to say that within 3 weeks of replacing the cutless bearing had some play but the leak (1-2 drops per second) occured even before it was worn.
    Does it leak that much at rest?

  10. #10
    Join Date
    Nov 2009
    Location
    Bristol
    Posts
    561

    Default Re: Stern Gland Leak - Again!

    Quote Originally Posted by Spyro View Post
    Does it leak that much at rest?
    Not since re packing. It seems to have settled for only leaking above 2 200 revs. If only for a short time it will stop when below that. If we keep it up high for a long time then it will leak, by varying amounts, when stopped too.

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