Join Date: Nov 2009
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High crank case pressure is caused normally by to much oil in the base not allowing the vapors to vent back to the front cover. Other things are the turbo can vent air from the compressor side to the crank case. Valve guides can leak air into the crankcase or you could have a piston scuffed and putting air into the crank case.
Your oil pan level should be 15 quarts / 14.2 liters. That is the level to the full mark.
To check the turbo, you have to isolate it and pressurize it to about 10 lbs, and if it vents into the crankcase it needs repair.
Pressurise the turbo outlet and that will test the valve guides for internal leakage, and if you release the pressure and turn it you can also find the cylinder.
The cylinder you can remove the pan and look up or remove the injectors and do a cylinder leak down test.
Just a thought!