Well it’s morning. And sure didn’t start out good, pretty sure the trusty Cummins just tore itself apart. Sounds like either a Rod has spun or it’s dropped a tappet or rocker.
That's not good. My diesel, when the POS starts in this cold weather, sounds like little worker elfs (can we still say that stuff?) banging away with their sledge hammers for a while. Hopefully not bearings. Good Luck