what causes air to be pushed out of sump to turbo drain pipe
my turbo is smoking on idle a common problem is for the sump pipe to which the turbo drain pipe attaches to to start to push out i presume cranckcase gases, any ides why this happens and how i can stop this from happening.
its this pressure thats stopping the oil from being drained back into sump so its staying in the turbo and probably being squeezed passed the seals
could be a blocked breather pipe, causing excess crankcase prssure, my mates 1.6 16v turbo corsa had the same problem, i traced it to the breather pipe having a part of its run tooflat, causing a pool of oil to form in the breather instead of vapour and blowing it into the turbo causing smoke, hope this helps
i dont think oil is being thrown into the turbo i think its more the case of back pressure forcing
gases out of the sump pipe to which the turbo drain pipe connects, the force of the gas coming out of the sump pipe going up the turbo drain pipe is stronger than the flow of oil being drained from turbo thus causing the oil to stay around the seals and causing the smoking.
which breathers do i need to check, i have checked the large pipe from rocker cover to turbo, small pipe from rocker to throttle, i cant blow down this but have been told this is normal as it only opens when car is warm, the pipe with dip stick is fine, whats left to check
how can you get the breather pipes in the wrong places are they not all different sizes, piston rings must be fine as car goes well and compression was 150 psi across all cylinders, drain pipe from turbo to sump is new.
just sump is leaking a little
as said repeatedly, it's blowby or crank venting problems.
But if it's not a sump pressurisation problem at all, then check and doublecheck the intake and the exhaust path for leaks.
I mean let it cool and go over from the inlet manifold nuts (all of them) onwards