Combines engine oil leak

I had that problem a couple of weeks ago. It was a crack in the oil line that runs to the turbo. The end of the line has a fitting that is soldered on and needed to be resoldered. To get the line off you need metric allen wrenches.

If point of orgin seems to be high on push tube cover you need to look closely at tube. The tubes will wear threw near the top and it is worse towards flywheel end of motor. I will feed a coated electrical wire around tube and grap with a couple vise grips. I then twist it 180 degrees. I will then silicon over pin hole area. Hopefully you can then let it dry before use. I'm sure you would notice leak up higher if it were rocker cover. A jug shim will cause leak level with block but can will grow upward as it plugs up with dirt. I think any other leaks would show up clearly to you. Good luck