using lots of oil

[mudslinger]

hey all

took the mu out for the first time in the weekend. went really well however its leaking alot of oil out of the pipin where it joins to the intercooler on the intake manifold side of the intercooler. its 2.8. used over 2 litres and its blows alot of blue than previous times round town. does it sound like the turbo seals are gone? the turbo got rebuilt back in september last year and it hasnt done hardly any km's since then.

Anyone got any thoughts on this?

cheers

[geeves]

whats the fumes out of the oil filler like? If theres lots you need a catch can

[turnturn]

Is there any oil in the piping before the turbo, between the air cleaner and the turbo.
This is the area where any fumes from the motor are reintroduced to the intake system.
A hose comes off the back of the rocker cover and goes into the above piping.
Like Geeves mentioned, an engine breather catch can should reduce the amount of oil reaching the intake system.
There are posts on fitting the catch can.

[mudslinger]

i have a catch can on it one hose goes from intake before turbo and the other one from the back of the rocker cover and the can drains into the sump via dipstick tube. when undoing oil filler cap or taking dipstick out when running there isnt any fumes escaping just the usual bit of air you feel and oil spraying out. nothing out of the ordinary.

With the catch can should i not have one of the hoses going to the intake piping? should i block that off?

[turnturn]

My understanding is that the catch can is designed to go where you have it. It is only there to seperate (and store or drain back to sump) most of the oil from the fumes coming from your engine.

[geeves]

It sounds right. Pre catch can the hose from the rocker ran to the intake. The catch can is basically a big settling pond in this hose which lets the oil settle out of the vapour so it can drain back to the sump. Only catch is to make sure the hose to the inlet comes from the top of the can

[mudslinger]

the can has 2 hoses on top and a small hose which drains to sump on the bottom. so i guess i've got it round the right way.
doesnt really explain where all my oil is going tho

[mudslinger]

well heres an update.....

pulled all the intake piping off and intercooler. turbo has no play and seems quite dry in housing, however intercooler is full of oil and so is intake manifold. the piping from the airbox to turbo is filled with oil. so i'm guessing all the oil is coming from the breather from my catch can.

What options do i have? What can i do to stop it putting the oil in thru the breather?

[geeves]

Is this a commercial catch can of a home made. My guess is its either full of oil, Too small or the internal connections are wrong. If comercial it should have markings for where the hoses go.

[mudslinger]

catch can is a commercial one. made in chch by isuzu experts Amma Motors, they are also on trademe well used to be.
it shouldnt be full as it has a drain which empties thru dipstick tube. I had it on my older mu and it was fine. Maybe the pipin to the dipstick tube is blocked?

But there is some much oil in the intake its everywhere and it came gushing out of the intercooler when i stand it up vertical.

Any other suggestions?

[geeves]

I would be doing the fume test with the engine hot and cold. The breather is the only place the oil can be coming from. Only possibilities I can think of are excess fuming but I think the oil use is too high for this, Blockage in the oil galleries stopping the oil draining back to the sump from the head or the flap in the tappet cover stuck.
my money is on option 3
I dont run a catch can but Ive only done 200k and oil use is well less than the 2 marks between changes

[mudslinger]

i have done ther fume test and its nothing out of the ordinary coming out filler or dipstick tube.
blocked oil galleries? should i be worried? how do i unblock them?

What flap are you refering to? is it where the breather comes out to the catch can?

[geeves]

I havent chosen the right term. The galleries Im refering to are the returns to the sump. If these block or thee is too much oil flow then the oil builds up in the tappet cover and overflows into the intake. Im fairly sure there would be other symptoms.
FJ40s used to have a problem on long steep climbs of the oil running to the back of the tappet cover where the drainage through the back push rods only wasnt enough and they would run oil into the intack system. In severe cases this could hydrolic the engine.
never heard of it in an isuzu but driving at extreme angles could cause similar things

[mudslinger]

how do i unblock or check if this is the problem?

[geeves]

If after the engine has been running a while the tappet cover is full of oil you have a problem. Cant see it being this as these passages are quite big (this is how the new oil gets to the sump during an oil change)

[pig75]

Is there a non return on the drain? If it hasn't it might be pushing up the dipstick tube into the can.

[mudslinger]

is it possible for the oil to go back up the return line?

What other options do i have?

[pig75]

is it possible for the oil to go back up the return line?

What other options do i have?

Yes
Have a read of this
viewtopic.php?f=26&t=909

[mudslinger]

i shall have a play round and try it
cheers

[mudslinger]

where is a place to buy the valves from here in chch