td5 breather pipe

hi all
i have a td5 disco with a remap and egr mods and one or 2 more mods
my problem is am getting a lot of oil from the breather pipe the rocker cover one
can any one tell me y this maybe
and what i can do to stop it.

Blow-by combustion gases (bypassing piston rings).
Cannot be stopped unless you change piston rings, polish cylinder bores, etc.
Can be dealt with by installing a CCV (Closed Crankcase Ventilation) oil separator i.e. Mann+Hummel ProVent.

Full pdf brochure.

thanks for the reply
is this the only thing that can course it then can it not be a valve stuck open or somthink
she as only done about 70.000 and piston rings gone thats not much good is it

Did not imply your piston rings are gone, just letting more combustion gas through (increased compression & temperature due to remap?).

A stuck valve would have much more noticeable consequences I'd think. Carbon deposits on valve seat(s) possibly, but not with that sort of mileage.

The breather valve or PCV (marked "TOP") limits the depression the turbo applies on the breather hose as engine speed increases. You can check how much direct crankcase blow-by you are getting by lifting the oil dipstick while idling. If no blow-by then is either the valves or a faulty PCV. But I'd say it comes from below.

Blow-by is completely normal on a modern diesel engine, but is IME aggravated in the Td5 due to the poorly designed oil mist recovery system (crankcase gas 'swirling' chambers within the rocker cover that supposedly condense oil which falls back into the cylinder head). Thence the recommendation to install a proper oil recovery system.

Also the air filtration system is not a very bright one for pure off-road use as engines tend to get "dusted up" fairly quickly contributing to increased blow-by.

I just got around to replacing my PCV valve... following a recommendation somewhere that this should almost be a service item.

When blowing through the new PCV it definitely closed, but the old one didn't! May have saved installing a catch can/Mann+Hummel Provent for now...