Thread: Oil from Turbo question

Something else to check on - there is normally a restrictor in the oil feed banjo bolt. From memory I think its about 1.6mm for a journal bearing turbo, and smaller for ball bearing ones.

16mm hose should be fine for the drain. Think I'm only running 13mm on my T25.

Might seem like a silly question, but is the drain actually at the bottom of the turbo - ie not coming out the side or top?

Steve

How much oil pressure are you supplying to the turbo? They only need about 20psi. Too much squirts oil out the seals.

The factory Isuzu oil feed line is about 6mm ID and about a metre long, that provides pressure reduction.

Yes oil drain is out the bottom and oil feed at the top.

I am using copper line for the oil feed, tapped into vacuum pump line down where it meets the block like others on here and using the original banjo and bolt on the turbo. It is exactly 6mm ID copper line Dougal and would estimate the length of the pipe to be about 1 to 1.2m, maybe a tad more. So no worries there, in terms of oil pressure into turbo I would say.

Have just recently fitted the catch can using the same size hose as the drain, 16mm, which comes from the rear inspection cover.

I think the oil in the line must have been a combination of too much crankcase pressure because of the one and only N/A crankcase breather and a buggered air filter.

Here is a few happy snaps.

Before I knew about the oil going walkabout in my intake I did increase fuel by quarter of a turn and the difference was incredible. The thing pulls like schoolboy.

It only hit 550 on the EGT when giving it some berries but haven't done it with a big load so it can stay there for now until further testing.

Very happy with it and hopefully I can keep up with traffic towing the boat up to the Cape in September.

Thanks for the piccy's. Great looking installation !!

Steve

The 12ht toyota diesel has the butterfly in the intake to close the air flow off to shut the motor down, instead of shutting fuel off! They use glow plugs to preheat. They still have a an exhauster on the alternator for brakes and for the operation of the engine shut off.

Originally Posted by c.h.i.e.f

this is not entierly true...on our 4bd's it is true but take a 12ht for example they do have a butterfly in the intake system however this is not really related to much more than pre-heating/heating....

problem solved i hope,the breather which connects the tappet cover to inlet manifold was pressurised form the turbo.This was noticed by an increase in oil pressure,forcing oil out the turbo seals, and most notably in the NEW crankcase breather installed in the pushrod side cover, the pressure coming out of the new breather and into the catch can was amazing.I have blanked the breather on the tappet cover for the moment as the new one(side cover) is doing an adequate job, i will most likely install a "T" piece in this when i have time.
Thanks to all for the advice

Originally Posted by landrover dave

The 12ht toyota diesel has the butterfly in the intake to close the air flow off to shut the motor down, instead of shutting fuel off! They use glow plugs to preheat. They still have a an exhauster on the alternator for brakes and for the operation of the engine shut off.

actually what i said makes absolutely no sense so yes you are correct the butterfly on a 12ht is used for shutting the motor down via vacuume lines/actuators as the IP does not operate exactly the same as the 4bd (edic motor etc etc for shutdown) however they are one of very few diesels that do not have glow plugs...