Mystery oil leak on glk250 (om651 engine)
 

Hello, would anyone happen to know where the line at the back of the om651 engine leads to? And why it would be leaking oil? I’m thinking possibly a drain for the valve galley in the center of the valve cover where the injectors go, or maybe a tattle tale from the cylinder heads or over flow from the engine block/ oil pan..




I’ve ordered a valve cover gasket but I’m hoping someone could shed some light before I start disassembly. I’ll attach photos of the hose in question it’s routed down the drivers side of the engine and is tethered to the side of the bellhousing. It is #240 in the diagram. Thanks -Ryan


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