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How did you tell the hydraulic fluid was leaking into the crankcase from the gear pump?

You may be on to something, I drained the oil and it's thin but not appearing to separate. I checked the hydraulic fluid is below the dipstick level after running about 6 hours. How did you find the hydraulic pump leak? Also I pulled the fuel pump again and checked the diaphragm and it looks...

I'm trying to troubleshoot a B8200 (D950 Engine) that is getting diesel in the oil pan. This was noticed after I saw oil dripping out of the valve cover vent tube. I've taken out the both the fuel pump and injector pump and everything "appears" fine. I already had the injectors inspected and...