oil breather line out of rocker cover

[def90]

at the moment in my 4BD1 i have the the breather line out of the rocker cover going into the air inlet - after the filter, before the turbo intake. this is dumping large amounts of oil in my turbo and thus leaking out the seals.

i thought originally that my turbo's seals were gone (turbo was off a RB25)so purchased a new garret meant for the 4BD1 (only $1150 - i thought that was cheap) and have just had that fitted. my mechanic didn't reconnect the breather line back into the air line and said i should try dumping it into a catch can or just 'dump it' to elleviate excess oil going into my turbo.

we pulled off the breather line to see how much oil came out when running, not a huge amount but with a bit of fumes.

is this the best way around the problem? as the oil breather went into the air line pre-turbo days.

cheers

[shakes]

oil catch can, just make sure it is plumbed back into your intake or the EPA will make your life fun.

Simon

[def90]

cheers bud. will do i think.

[460cixy]

turbo falcons have the same set up straight from the valve cover to the inlet. there always leaking oil and shit from the intake pipeing but dont burn oil or blow smoke i wouldent worry about it at all un less your engine breaths that heavy it may run on its own oil now that is a problem

[rick130]

and it's the same setup on a 300Tdi and our TD42T Patrol, and they all 'breathe' oil through the system, just a fact of forced induction life, really.

[ISUZUROVER]

The 4BD1 originally had an open breather system - rocker cover went to filter but side vent went to atmosphere. So legally you should be able to vent to atmosphere - but it is not ideal.

The BEST option, would be to find a modern diesel at the wreckers with CCV (closed crankcase ventilation), and remove the cyclonic seperator which will be the main part of the system (if it has a cyclone and a filter, only use the filter). You can also contact Mann+Hummel or Donaldson directly and buy a new one.

This will remove the main part of the oil (MUCH better than a catch can), and send it back to the sump - the air you can then feed to the intake.

ALL turbo diesels should have CCV cyclones/filters - as the oil shortens the life of the turbo. But only large (expensive) diesels have them fitted, as the manufacturers only think it is worthwhile on those (because of long engine lifespan).