It's just "inter-guessin" diagnosis. most trucks I see with the "blowin oil, dead miss" once you remove the oil fill cap and start it resembles the Chattanooga choo choo which usually ends up being a scored #6 piston. That's my guess and I'm stickin too it.

 

very very true , i am just saying if he did blow a head gasket on the compression side of the gasket, it could be pushing the oil into the coolant. doesnt all ways mean a bad cylinder althoght i am not going to rule that possiblility out becuase i have been wrong many times before

 

Yes, very true, but until the original poster reply's with "coolant resivior mysteriously overfull" (compression pushes coolant into it), or "there is milkshake in my radiator", I'm going to believe that the head gasket is ok in this case.

 

Ok, let's take some of the guess work out of this deal.

WITH THE ENGINE COLD!!!

pull the injectors from the mill

take the valve covers off

open the oil fill

remove the radiator cap

Start with the #1 cylinder making sure that both valves are closed, and take your compressor and introduce air into the injector opening make/find/fab a way to get a solid seal with your air nozzle. Have a friend/family member look into the radiator and see if there is any bubbling, then listen at the oil fill tube and see if you hear any hissing. next would be to listen through the injector hole of the next cylinder to see if there is any hissing.

Do this with all 6 cylinders.

You didn't mention in the first post what your engine temp was or if the mill was blowing any color smoke while holding a steady rpm.

This is pretty rudimentary but the cheapest way to quickly diagnose where the problem is.

1. if bubbling through the radiator - most likely head gasket - possible crack
2. if air is heard through the breather tube - rings, piston - possible crack
3. if air is heard in adjacent cylinder - most likely head gasket

by no means does this represent all issues but will help you to pinpoint whether or not you will need to take it to the next step....shelling out bucks for a full diagnostic. Head gasket issues are not that expensive to replace, just make sure that the surfaces are not warped.

 

I say unless you have tools/knowledge, find a good diesel mechanic and have them diagnose the problem. If you do have the tools/knowledge, pull the injectors, do a compression check. This is the best way to tell if your problem is internal or not.