That's cause the seals on the bearings are blown and going through the other side.typically don't see soot on compressor side, but on the exhaust side we are not seeing the leading edge of the blades in correlation with airflow. Ill bet they look beat to hell.
Look at the edges of the blades in the second pic. That is the exhaust side. Chunks of blade are missing.What exactly is wrong? I must be blind.
The soot may be from crankcase recirculation?
Top pic is cold (intake) bottom pic is exhaust. Caterpillar 3196, no EGR. Oil sample looked fine, but hardly any hours on the oil since I hadn't put the tractor in service yet. It was an auction purchase, from a farm retirement sale. Owner had the tractor for the last 3500 hours, very light work.I'm thinking the top photo is the hot side and the bottom is the cold side? Only thing I can bring to mind at this moment is the amount of soot on the housing in the bottom photo. I'm thinking the cooled exhaust gas recirculation system blowing soot and maybe coolant into the intake side. Maybe a leaking cooler. My other thought is diesel leaking into the crankcase from a bad pressure pump and diesel vapor being sucked into intake. Maybe those fumes caught on fire in the intake manifold? The damage on the impeller points to overspeed from a run away engine. The damage on the turbine points to carbon being expelled from the firing chambers due to the overspeed.
I'm thinking that the manifolds need to come off looking for more evidence. I don't know if this is an electronic engine but if so a review of the operating history prior to the failure needs to be done. Oil sample should be taken before any other work is started.