Did Land Rover ever publish a specification for crankcase pressure for the Td5.

I have put in hours searching the web for references but have found nothing regarding a crankcase pressure specification.

Why do I want to know? .......because crankcase pressure is a good indicator of engine condition and whilst I have been able to measure the crankcase pressure of my Td5 and calculate the blow-by (L/min), the resulting data is meaningless without a reference to compare it with.