Oceanis 373 Greasy Water In Engine Start Battery Compartment

[Dadawada]

After a long (4.5 hour each way) trip over the summer, I noticed water with grease in it under the engine and in the starter battery box area. I was able to use soaking material and soak it up and dispose properly at our marina. No idea where it came from, but because it looked like black thick grease in sitting the water I thought it may have come from the stuffing box. I wasn't sure, this is a new boat to me. After cleaning it up, I never noticed it again so it didn't appear to be something leaking from the water system or elsewhere. We dock in a large river that empties into the Pamlico Sound in NC. So it is mostly fresh brackish water.

Today, I was checking on the boat and once again there was water in that area. We had taken the boat out twice in recent weeks on motor due to no wind. So once again I'm wondering if it is coming from the shaft. It appears to only happen when we motor with the boat.

 

[Davidasailor26]

On a 373 I presume you have a Volvo droplets shaft seal? Something like this?

If so it is possible the seal is leaking if it’s old and worn out. That wouldn’t really explain the grease though. There is a little grease in the seal but it stays pretty much its original blue color. I don’t think water leaking past that would make dirty greasy looking water. It’s also possible the “grease” is just belt dust and other random contaminants from the engine accumulating in the water.

I’d start by putting a paper towel under the shaft seal. That should make it easier to inspect to see whether that’s the source or if you need to look elsewhere.

 

[JoeWhite]

A photo would help.
When I replace the flax packing inside the stuffing box, I put lanocoat before I screw in the nut. When the lanocoat becomes worm it drips and makes a mess. I keep a small tray under it to catch the drippings and the seawater so it is easy to clean.
Next time you see this "grease" scrape it to a plastic tray and see if it is lanocoat.