blowby

[dieseldog]

I also have a 1994 mustang 940 skidsteer @ a 4 cyl yanmar diesel and am getting oil blowby out of the valve cover breather not through any exhaust any ideas ?:

 

[F350DRW1]

1 or more intake valve bad..bad valve guides, perhaps. PCV valve not working -or hose closed-just guesses.

 

[95_stroker]

Bad rings?

 

[BJS]

more than likely the rings are toast that's the most common source of blow by.

The reality is that you could be having other problems that would be causing the smoke but they are long shots.

Do a compresion test & cyl leak down test and you should find the results.