1985 detroit 6v92 motor problem

My Cummings Big Cam III 400 smokes,, thought it was normal...lol

 

Oil in the air box can have a few different causes but most of them involve disassembly to verify & repair. Like Box Car said wrist pin seals, worn rings can all cause the issue. You could just take apart the side thats pumping the oil. If the heads are ok you could put some liner kits in it. If you end up reusing the pistons be sure to disassemble them & replace the seal ring between the skirt & dome.
When you replaced the blower did you go over the governor settings to be sure the racks are balanced?

 

At one time ( 1978-81? ) The air box drains were connected to the oil pan. It did not work out and a campaign was sent out to remove and let em slobber on the ground. That and the correct oil can make a big difference.
Some oil in the air box is normal and why they have air box drains to relieve it. That is a 2 cycle engine like a chainsaw, made to run not idle.

 

So that's where the term "Green Leaker" comes from I guess.

 

The only reason a detroit dosent leak oil is because its out of oil.