td42 turbo oil leak......

[new2zukes]

i have a niggle and i have tried everything, ive recently put a turbo on the td42 and it has a water to air intercooler on it. ive got an oil leak from the rear of the turbo and its making the exhaust expel oily smoke. ive got a turbo off an rb25 and have pulled it apart and put a seal kit threw it. the oil fittings are -4an hose aprox 800mm long with 1x 90 degree bend and a 1.5mm reducer in the inlet and a 3/4 inch ID outlet which feeds direct into the top of the sump. turbo is journal bearing. air filter is pod thats been cleaned. have pulled the turbo off far too many times now and am getting a little frustrated, so thought id see if anyone on here has anything that might help. thanks.

martin

[Trundle]

Turbo is fuckerooonied

[tweake]

turbo may be to worn for standard sized bearings.

or the engine breather line may be restricted causing high sump pressure whic h causes oil to blow out past the turbo seals.

[slidenyo]

have you a valve on the tappet cover to a catch can?
is there excessive blowby with the oil cap off?when hot?
what oil pressure was the rb25 running vs the td42?
how many k's on the engine?
as far as I can tell a journal bearing turbo are fairly resilient and can survive with just 0.3bar -4.7bar oil pressure (quoted from the holset manual for truck turbos (scania)).
1stly I'd put a gauge inline so you can deliberate on whats going on .
but if you have a high k engine it could be simply be worn rings (mine does it after a long run coming to idle ,then clears when you move off.

[Twodiffs]

How simple is it to check the engine is breathing ok or that there is no restriction in the hose? - would you just put compressed air into the hose at the tappet cover and check it's flowing through the catch can and exiting the breather hose on the outlet end?.

[Crash bandicoot]

How many seals did you put on the exhaust side of the shaft 1 or 2? and how much gap/play was there once installed.

[y60 safari driver]

they are bad for blowing oil out the breather hose in the top of the manifold, try running that hose into a catch can for a while and see if oil in turbo improves. if you just want to do a temporary test catch can you can just use an old oil container, drill a hole in the top and run the breather into there (needs to be a tight fit) also make sure it is pointing down towards the bottom. put another hole in the top on the other side of the container (as far from the first one as possible) and run some hose from there to where ever you are currently running the breather to. make sure hoses don't go far into the container. keep an eye on it, if it fills up with oil it will suck it up and start to run on it. It may not of been doing it much before but you might have a lot more blow by now causing more pressure in the sump. just a thought.

[new2zukes]

hi all thanks for your replys, the turbo is brand new straight out of the box. have spoken to the supplier and i thought it was because i didnt run a constrictor in the oil inlet to start with and it had made its way threw for too long so i put new seals in the turbo and just one as it only has room for one ring seal. the breather is currantly going into a catch can so will be at atmospheric pressure when it reaches the catch can. it isnt the motor using oil as ive pulled the turbo off and found the leak, i can see exactly where it was coming from.
the oil pressure is at 4kg on the oil pressure gauge which is standard in all safaris.

[tweake]

disconnect it from the catch can. just have the breather open.
sometimes the cans don't flow well enough.

[timmay556]

disconnect it from the catch can. just have the breather open.
sometimes the cans don't flow well enough.

I just took some heater hose from the rocker cover to my RHS chassis rail as my turbo was sucking heaps of oil.

[new2zukes]

mmm doesnt seem as if something so small can make a difference but i have drilled more holes in the catch can and it seems to have stopped smoking, i keep trying to make it but i cant see any. thanks all for the replys and i hope that this is the end of the oil problem. the turbo has developed a squeeling noise when it builds boost then fine when on full boost but it doesnt happen all the time so am unsure as to what this is but it performs fine and the internals have no wear in them so il just leave it and see what happens.

[y60 safari driver]

does the catch can catch much oil? will always have some in there but shouldn't be heaps, if it is getting quite a bit in there you might need to check your rocker shaft