Gray green substance under oil cap - Cummins ISX15

[SupVit]

It's very expensive to repair at a dealer and as I see now, it's useless :)) Unfortunately, this understanding comes gradually, simultaneously with money being sucked out of pockets.

I buy every wrench and tool I need for repair the truck. Read lots of info. Prefer to fix everything by myself. But here I stuck with this loud knocking and cap. Need help. Asked Haggai Shop now.

Yes, on 2350 compressor is really loud when pumping. Does not need timing on this engine.