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Old 01-18-2013, 08:38 AM   #1 (permalink)
IamDave0887
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Bye bye banks turbo?

ran into an issue coming home from work last night.

It started doing it the minute the engine was started.

The turbo whistles like a jet from the exhaust pipe, but it builds 1/2 the boost it used to at best.

EGTs are hotter, as can be expected.

Tried pulling both the pre filter and the air filter itself for a short drive to see if either was plugged. No difference.

It screams out the exhaust like a holset on steroids, which i didn't think was possible.

I"m curious if perhaps the turbo isn't getting any oil. Not sure how as i'm not overdue on my oil change.

The turbo gets it's oil supply from down by the oil filter where there is a little pipe plug from the factory, which is exactly where banks tells you to put it. I'm using the factory Banks braided steel line with split loom over it to protect it.

Does anyone have a diagram of how the oil flows in the engine? I"m curious if perhaps the filter plugged up and is in "bypass" mode if the turbo oil supply line is affected somehow.

Engine oil pressure is normal, but perhaps the line is plugged?

My reasoning behind this is fairly simple, yet i don't know if it would make sense to others.

No oil, or not enough oil, to turbo would means decreased boost output and more whistle because the turbo is working harder to spin with lower lube.

The sound i heard is almost like when i was running a non-anti drain back filter on the engine. On a cold start the turbo would whistle pretty good at idle for a second or two until the oil got to it.

I'm going to head out in a minute to unhook the turbo oil supply line and crank the engine over with the IP wire unhooked. If i get oil from the line, well then my theory is busted.

I did pull over, rip the intake boot off the turbo and did feel a little side to side shaft play, but no in/out shaft play. This turbo had a little side/side shaft play when i got it and i don't think it has gotten any worse, but it's hard to tell at 10pm in a dark parking lot in 25*F weather.

There are oil stains on the back of the compressor housing that i haven't noticed before, but i can't see it with the air filter in place either. It's not a ton, but there is a stain. Perhaps it's just from the blowby coming from the CDR dump tube into the intake boot?

I can't find any post turbo leaks either. Both intake boots seem to be intact and the T-clamps are tight. Intake both upper and lower are tight.

Anyways, i can't drive it like this.


Thoughts?

Anyone have a spare T04B i can purchase/borrow to see if mine is toast?

It looked practically new when i installed it, but i suppose that doesn't mean anything.
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Old 01-18-2013, 09:08 AM   #2 (permalink)
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if you wern't getting oil it would be siezed/blown up by now. sounds like a boot leaking
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Old 01-18-2013, 09:12 AM   #3 (permalink)
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Originally Posted by Diaric View Post
if you wern't getting oil it would be siezed/blown up by now. sounds like a boot leaking
Drove it ~13 miles like this so i'd say your right.

Now the question is why would it whistle more out the exhaust with an intake boot leak?

It acts like a restriction in the intake pre-turbo, causing the turbo to spin faster in a vacuum. There's nothing in the intake pre-turbo. Pipes were clean and restriction free.

I found nothing leaking. No damaged boots or anything. The boots are about a year old, but they are the heavy duty ones from silicone intakes, designed to take way more than what i'm doing to them.

However, now that you mention it, the upper boot from the tube to the intake hat has had oil residue on the outside recently. Perhaps it was cut into by the clamps?
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Old 01-18-2013, 09:17 AM   #4 (permalink)
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Dave, while you have the line off the turbo, stick a funnel in it and pour some oil in it and see how fast it drains through the turbo.

I have a drawing of the oil passage and I will try and post it for you, but for now I can tell you that it go's from the pan to the coolers then to the motor in the top valley first(cam) then to the rest of the motor... where you have taped in will be past the filter and cooler.

Might be that the bearings are loose and at first start there is no oil filling the area around the bearings and the turbine side might be touching a small amount, how hard would it be to remove the down pipe while it's cold and look at the blade??
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Old 01-18-2013, 09:25 AM   #5 (permalink)
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Originally Posted by sctrailrider View Post
Dave, while you have the line off the turbo, stick a funnel in it and pour some oil in it and see how fast it drains through the turbo.

I have a drawing of the oil passage and I will try and post it for you, but for now I can tell you that it go's from the pan to the coolers then to the motor in the top valley first(cam) then to the rest of the motor... where you have taped in will be past the filter and cooler.

Might be that the bearings are loose and at first start there is no oil filling the area around the bearings and the turbine side might be touching a small amount, how hard would it be to remove the down pipe while it's cold and look at the blade??

downpipe is a bitch. It's a 6 bolt flange, and i'd have to unhook it from the rest of the exhaust, which is not easy. It's do-able but not easy.

Gotta figure this out.

Off to do some investigation now.
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Old 01-18-2013, 09:42 AM   #6 (permalink)
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Old 01-18-2013, 09:43 AM   #7 (permalink)
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Originally Posted by sctrailrider View Post

Same one i found in a military PDF file on the web, save for this one has more labeling. The turbo oil feed port Banks tells you to use is right above "B". The un-labeled one.

There is a pipe plug there from the factory.

Going by this picture the turbo would not loose it's oil supply if the filter was plugged. Good to know. Off to check for a boost leak.

Then i'm going to attempt to rip the downpipe off and check the turbine wheel.
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Old 01-18-2013, 09:45 AM   #8 (permalink)
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If the turbine wheel isn't hitting the housing, chances are it is fine. Look for a pre-turbo exhaust leak, check the drivers side doughnut and the cross over gasket. A small exhaust leak will kill your drive pressure and have a much bigger effect than a small leak in the intake.
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Old 01-18-2013, 10:17 AM   #9 (permalink)
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intake boot at the top from pipe to intake hat is fine.

Other than it being oily, there was no damage found.

Working on pulling the bottom intake boot from turbo to pipe now.

Going to attempt to shift the downpipe back enough so i can check the turbine wheel.

The excessive exhaust whistle makes no sense.

I can see excessive intake whistle with a boost leak, but exhaust whistle?

Perhaps the shaft sheared in 2 and the exhaust wheel is free spinning, but then i wouldn't be able to make any boost at all, nevermind 3 psi.

I'm confused.....
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Old 01-18-2013, 11:05 AM   #10 (permalink)
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Ok f*** my life.

turbo is getting oil fine.

however at an idle the compressor wheel is not spinning at all. I can turn it by hand, but it's stiff, so the bearings have been oil starved. The question is how?

Not good....at all.....

time for a new turbo......

Edit:

Does anyone know where i could source a rebuild kit? I don't even know if this one is rebuild-able yet or not, but it would be nice to know a kit is available before i go through turbo tear down.
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Last edited by IamDave0887; 01-18-2013 at 11:48 AM.
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