ok, regarding turbo slobber...........

[TexRdnec]

http://i34.tinypic.com/2mcycqs.jpg

http://i37.tinypic.com/fc7mhk.jpg

http://i34.tinypic.com/10gfww5.jpg

http://i34.tinypic.com/wmi6j6.jpg

i've tried the high idle, i've ran the hell out of it in the limited space i've got and i've still got slobber going.

however, i have nothing coming from the top of the stack. does the seal look abnormal to you? i'm thinking it's the equivalent of crossthreaded?

looks like the seal is much closer at the top than the bottom if you can see it from the pictures. the gap in the seal even looks like it's completly open. could this be the case? maybe it's just not seated well?

any other thoughts?

 

[Westech]

That is A LOT of slobber. If it was just soot and water it would dry up in a not so long amount of time.. that looks to be oil based. Think it might be time for some seals.

I bet it leaks when the engine is OFF.

 

[Coal Cracker]

I'd get that turbo rebuilt before she runs away.

 

[TexRdnec]

moar information needed. what seals? would seem it's a brand new turbo.................

 

[gimpyrobb]

It will only run away if the intake leaks, not exhaust. I think seals in the turbo would be a good idea though.

 

[Coal Cracker]

moar information needed. what seals? would seem it's a brand new turbo.................

The seals on the turbo shaft, get the turbo rebuilt

If it's new, get your money back.

 

[Keith_J]

Check to see if the turbo is making boost. There is a pipe plug in the intake for measuring the manifold pressure, a 0-15 PSI gauge is used, run the engine under load when running it up, 2nd or 3rd gear run.

If developing pressure on the intake, then there HAS to be pressure on the exhaust side. With these pressures, the ONLY way for oil to be leaking into the intake is from a clogged oil return line OR crankcase breather.

Do NOT replace the seals on a turbo that is working, the seals are FINE. Unless there is foreign object damage, burned turbo seals are from burned turbo bearings and that means the turbo isn't working.

This is most likely diesel slobber. A blown turbo will spray oil EVERYWHERE, the volute of the turbine and compressor will fill with oil.

Shaft seals on a turbo are not like wheel bearing seals, there is NO POSITIVE SEAL because unlike a wheel turning at 400 RPM, the turbine is spinning at 50,000 RPM. Instead, the seals direct oil flow away from the gap. Air or exhaust then leaks INTO the bearing housing, draining to the crankcase. But if the engine isn't generating boost in the intake, there is little exhaust pressure so there could be some weeping.


The ONLY seal I would even consider replacing is the exhaust ring which joins the flex pipe to the turbine housing., IF the engine develops at least 4 PSI of boost. Since your FDC is bypassed, it might not develop full boost.

 

[southdave]

Sounds good

 

[gimpyrobb]

FDC being bypassed will develop the most boost. The fdc will only cut fuel from the motor, bypassing will add fuel to the motor.

 

[TexRdnec]

once again, keith, that was above my paygrade..............

are you saying that i was probably right? that the seal between the turbo and the exhaust might just not be tight and instead, "crossed?"

i has beer. come back down!!!!!!

 

[Keith_J]

Yeah, it isn't the turbo seals but the exhaust gasket on the turbo. You could tighten that but it is probably rusted which is causing the leak of slobber.

Cool weather, high humidity and low operation speeds make this all too frequent.

The only other thing that could cause slobber is leaking injectors. This would make for an unstable idle speed. And I didn't notice any of that. I don't have the test stand for checking that but there are ways of checking without special tools. How? Magic.

Pull the injectors from the head, reconnect to fuel lines and crank the engine to prime injectors until they all fire. Wait 30 minutes, then video tape all injectors while cranking again. If they all fire in sequence right off the start, injectors are fine.

 

[Boatcarpenter]

Keith_J
"the ONLY way for oil to be leaking into the intake is from a clogged oil return line OR crankcase breather. "
I believe you are mistaken on this point. My turbo was working fine and yet it was dumping oil into the intake. So much so that I was belching a trail of blue smoke and after being shutdown for 1/2 hour or so the bottom of the intake impeller housing had a puddle of oil in it. Also leaked some from under the hose connecting it to the intake elbow.
Bearing housing was shot to the point that the intake side vanes had just begun to hit the housing. Turbo NFG. Got another one and had it rebuilt. All is well now.
BC

 

[TexRdnec]

from just looking it would seem that there is a lip on the exhaust pipe that fits into the end of the turbo there, is that the case?

if so it does appear that it's just not seated correctly.

assuming that were correct and this was just a case of an open exhaust, would this amount of slobber still be unacceptable?

 

[Keith_J]

from just looking it would seem that there is a lip on the exhaust pipe that fits into the end of the turbo there, is that the case?

if so it does appear that it's just not seated correctly.

assuming that were correct and this was just a case of an open exhaust, would this amount of slobber still be unacceptable?

Wow, on second view, that IS the case. IIRC, there is a gasket that goes in there. And that would make for the slobber mess.

 

[TexRdnec]

well i got it apart this morning. there was a thin metal gasket in there. i got it all back together and this time straight.

ran it for about 15 minutes around the place, no drips but there may still be a film present, not certain, didn't clean the clamp.

might just need to go get her on the road and really hot yet.

there was 0 side to side play on the shaft and just enough back and forth that i could tell it moved at all. there was no visible oil in there at all, just some soot. heres what everything ended up looking like:

http://i35.tinypic.com/jagh2t.jpg

http://i36.tinypic.com/prccx.jpg

http://i35.tinypic.com/25zlfer.jpg

 

[Keith_J]

Glad to see you got it fixed! Since you have been running it a bit, that stack is nice and crusty. When you get it out on the road, a lot of that soot will blow out.

The turbo sounds completely healthy. And looks it too.