Originally Posted by
RoverDover
Mine had a hose leading to a small canister on the side of the head that drained to the pan and had another hose going to the intake with an inline PCV valve.
That canister is the air/oil separator and gives all the oil suspended in the blowby air a place to gather and drip back into the oil pan (as opposed to continuing back to the intake manifold and gumming up the intake system and valves).
Other versions of the 2.5...not sure if earlier or later variants...just route the blowby air from the valve cover breather to the intake side of the air filter element, allowing all that blowby oil to be caught by the air filter.
--Mark
1973 SIII 109 RHD 2.5NA Diesel
0-54mph in just under 11.5 minutes
(9.7 minutes now that she's a 3-door).