Gerhard... From your original post, I gather you have run the engine in the past and had not experienced oil coming out of this opening. With that said, I would consider a few things...
1. Is this intended to vent any air or gasses from the crankcase? I'm assuming it probably isn't the case since no tube protrudes from that opening.
2. Is this opening threaded. If it is, it might be intended to be used for second oil pressure sending unit. My Perkins
4-108 has two openings where oil pressure sending units can be installed. One of the openings is much higher than the other. If the oil level is too high and the higher opening is not plugged, oil WILL come out of that opening.
I find your situation of greater concern, though. You mentioned the low oil indicator light/buzzer activated. If it was simply an opening intended for a second oil level/pressure sending unit, your oil alarm
should not have activated if it was simply shedding excess oil.
I am guessing pressure is developing in the crankcase and oil is exiting from that port due to the pressure. This can be from various sources, including a faulty valve or seal or head gasket
. It is difficult to tell.
If this opening was never plugged AND you had previously not experienced oil exiting from it, chances are plugging it would defeat its purpose.
I checked the boatdiesel.com forums
and there was a report of the exact problem you were referring to. Here is the post:
Topic: Volvo MD2040 Catastrophic Oil Loss
Originator: Kevin Salt [email] Guest Date:
July 04, 2005 - 05:12 AM My oil pressure alarm went off yesterday and I found oil spewing out of a small hole (about 1/4") in the engine block just to the left of the oil filter. Oil was coming out fast enough to completely drain the engine in few minutes. The oil filter has about 80 hours on it. I have 2 of these engines (the boat is a catamaran), the other one has the same hole, but nothing coming out of it. Any help would be appreciated, hard to find a working mechanic on the 4th of July.
I have photos, but this site will not let me upload them or link to them.
Unfortunately, there were no responses. I wish there were, as it sounds exactly like what you've experienced.
a description of your problem on boatdiesel.com. There are a lot more members now than there were back when the above post was made. Hopefully, you'll get some good info.
Please keep us posted on your progress.