PeachParts Mercedes-Benz Forum - 123 Turbo Waste Gate Oil Leak??

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Quote:

Originally Posted by Diesel911 (Post 1748207)

I was thinking on similar lines. Bad exhaust valve stem seals and worn exhaust valve stem/guides. The oil drips down the stem when the valve is closed and is blow off of the valve and into the manifold when the exhaust valve is open.
Would he be able to pull off something simple like his EGR (if he has one) and take a peek into he exhaust manifold to see if it is wet with oil?

On the 603, I do see a wet film of oil at the juncture where the EGR pipe is capped off. While I would figure that the oil would smoke off the inside of the exhaust manifold, it might be possible that this does not happen in the cooler EGR runner.

Just another thought; if liquid oil gets into the exhaust manifold/exhaust houseing of the turbo even though it is not atomized some of it will burn but remember since the exhaust gas has already burned the fuel (and is not as hot as it was in the combustion chamber)there is not much oxygen left to burn anything else. So a little bit of oil leaking may not produce alot of smoke because it is not going to burn much.

At the present state of his leak what harm could come if cchka1ban continued to run his car for another let us say 5,000 miles?

Quote:

Originally Posted by Diesel911 (Post 1748290)

So, let me catch up a little here. We're thinking it's possible that the old head would blow off oil vapor internally, where now with new valves and guides that that is no longer possible and oil vapor from (my fair to moderate) blowby is being sent into the intake, blown past the turbo and into the wastegate where it's draining on the frame crossmember then onto the driveway.

We're also thinking it's possible that oil could be delivered to the wastegate through bad turbo seals. Is this correct? Right now I'm going through a fair amount of oil--quart every 700 miles or so. I'll monitor to see if that increases. I get blue smoke on startup only, and I have grey smoke on acceleration under load. White smoke whisps on idle which I'm pretty sure is fuel smoke (probably injectors or pump timing). But overall the car runs real strong--15 second 0-60.

Thanks, guys, for all the input.

Quote:

Originally Posted by GRIESL (Post 1748427)

The comment of mine quoted was aimed at cchkaibans' problem. However just like new parts can come out of the box assembled wrong or otherwise unservicable; it is not impossible for rebuilt heads to sometimes have problems.
Of course oil can leak out of bad turbo seals.
Blue smoke in a gas car is associated with oil burning. If the same is true for diesels where can the oil come from? From the compressor side of the turbo (a long trip to get there), around the piston rings, or through the valve stem seals. But if an engine is burning the oil it would be noticed on the dip stick (if it is not leaking out somewhere).
I wanted to go back to this part: "So, let me catch up a little here. We're thinking it's possible that the old head would blow off oil vapor internally, where now with new valves and guides that that is no longer possible and oil vapor from (my fair to moderate) blowby is being sent into the intake, blown past the turbo and into the wastegate where it's draining on the frame crossmember then onto the driveway."

My understanding is that the blowby (vapor) sent into the intake goes into the compressor side of the turbo, into the intake manifold and from there pass the intake valve and into the combustion chamber to be burned during combustion. It will not get anywhere near the waste gate of the turbo.

Quote:

Originally Posted by Diesel911 (Post 1748792)

So oil appearing at the wastegate would not be the result of oil vapor venting from the crankcase. Is the only other way that oil could get there in any substantial volume would be through leaky turbo seals? If I reach in there, I can feel some side to side play. How much is acceptable, and what's the best way to measure it accurately? Thanks again for the info--this is very helpful.

Quote:

Originally Posted by Diesel911 (Post 1748792)

My understanding is that the blowby (vapor) sent into the intake goes into the compressor side of the turbo, into the intake manifold and from there pass the intake valve and into the combustion chamber to be burned during combustion. It will not get anywhere near the waste gate of the turbo.

Follow the wastegate hose from the wastegate actuator to the opposite end.

Where does it terminate?

Think there might be oil vapor/mist at that location?

Quote:

Originally Posted by Brian Carlton (Post 1749034)

Follow the wastegate hose from the wastegate actuator to the opposite end.

Where does it terminate?

Think there might be oil vapor/mist at that location?

Yep, the little elbow nipple definitely has oil oozing there. And after an 80mph jaunt on the interstate, I could see more coming from the egr. So if oil or vapors are present at those locations, what does it mean? Where is it coming from, and can it be fixed? Thanks.

Quote:

Originally Posted by GRIESL (Post 1749505)

Oil in the intake.

Could be blowby, but, more likely to be turbo seals.

Quote:

Originally Posted by Brian Carlton (Post 1749034)

Follow the wastegate hose from the wastegate actuator to the opposite end.

Where does it terminate?

Think there might be oil vapor/mist at that location?

My understanding was that he said the hose was clean. I assumed he pulled the hose off and looked inside and saw no oil? It is beginning to look like he did not do this and he ment the outside of the hose was clean.
"I am assuming that the 6-8 inch small hose coming out of the front of the turbo housing going down the the circular "thingy" is the wastegate hose. The circular thingy looks like it is made of two parts. I have a lot of oil at the bottom of where those two parts meet. The hose itself is clean, and where it connects is also clean. Everything south of that is drenched in oil. My car does have blow-by...a lot of it. The oil drip is definitely originating from the described location and not the airfilter housing."

Hey guys, sorry, I've been busy the last two days.... Each end of the wastegate hose is oily, along with inline connections where a boost controller resides. Then the actuator is oily, and this is definitely where oil is dripping. I took off the u tube to the intake and i got liquid oil on my finger when i scraped around in there.

What about a failure in the way that oil in the oil vapor is returned to the crankcase? I'm assuming that round thing in the air cleaner is supposed to "condense" the oil out of the vapors and return it down the tube to the oil pan. I hear there is also a check valve down there. Suppose that one of those two things could be failing? Thanks again for any and all input.