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Old 06-02-2020, 10:23 AM   #1
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1995 Cummins 8.3L Mechanical: What is this blackened thing?

Gents - please offer an assist. I have had trouble finding out "what" this device is, and if the black-charred color is common, or something to be immediately repaired and replaced. Please see these pictures. On the Left side of the engine, there looks to be a round housing of sorts, that is charred up. Thanks Jim
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Old 06-02-2020, 11:00 AM   #2
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Thatís the intake side of your turbo ( forced air intake). The black looks like soot from exhaust. You need to check for a crack or a missing piece of gasket.
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Old 06-02-2020, 11:10 AM   #3
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OK excellent thanks!
Jim
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Old 06-02-2020, 12:10 PM   #4
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Yup, the other side is under the cover.

That cover ( heat shield ) needs to come off to see the actual ehxaust leak.
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Old 06-02-2020, 04:06 PM   #5
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Thank you - please help me understand. Would this leak be a nuisance, cause performance loss, or actually become a failure point (potentially).
Jim
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Old 06-02-2020, 05:03 PM   #6
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I'm guessing the crack in in your exhaust manifold.

Do a smoke test through your exhaust and your will find your crack.

...or maybe since you see so much soot you can just hold your hand down there with the engine running and you can feel where the crack is?

Or maybe...you just have to replace your exhaust gasket to the turbo? ...but it's looks clean in that area so probably not.

As "Kuzzy" said: ...removing that very interesting "heat shield" will tell you if the crack is on the turbine side, but if you have a crack there I would think your Manifold Pressure will be lower.

If you don't have a MP gauge, and you have a crack on the turbine side, I would think your engine performance is reduced. Is it? Do you have any black smoke, which would signal your turbo is leaking oil into the exhaust chamber. ...Note, this is a separate concern from all that soot, but if you have any turbo performance issues then you need to look at all these circumstantial issues. I.e., if you can rule certain things out it will help you sleep better until a mechanic can look at it.
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Old 06-02-2020, 05:29 PM   #7
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It may also just be the band clamp holding the ehxaust pipe to the turbo.

You don't want hot ehxaust gases blowing soot all over your engine compartment.
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Old 06-02-2020, 07:22 PM   #8
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OK thank you! I just finished a 2300 mile trip from Los Angeles to Denver & back. I40 out, I-70 back. Performance is very good, with high Boost Pressure. 65 mph most the way back.

There was engine work done before I bought the rig 8 weeks ago. it had a new Cylinder Head, Radiator, Water pump, & main engine drive belt installed. I wish I took a picture from the day I picked it up. Performance wise - all seems very good. Jim

Edit: I found a picture from when I picked up the Rig. The same area has "less" soot on it. ??? ideas
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Old 06-02-2020, 07:44 PM   #9
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If your not losing boost or power, its most likely on the outlet side of the turbo.

Take off the shield.
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Old 06-02-2020, 09:00 PM   #10
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Best I could do tonight. Some better photos. The "soot'ed" area is very specific and doesn't look like it touches anything under the Shield. I could not remove it tonight, but also took a picture from the opposite side, where you can see under the shield a bit. Jim
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Old 06-02-2020, 10:58 PM   #11
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...Because that soot is evenly distributed over both sides of the turbo, then maybe "TwinBoat" is right and your band clamp holding the exhaust pipe to the turbo is loose?

Here's what a new one looks like:

https://www.ebay.com/itm/Holset-HX35...ty!96826!US!-1

Note: The exhaust side of the turbo always looks rusted and pitted, but I can see from the "pre-purchase" photo that there was soot. ...Like someone cleaned it. ...But if this is you only complaint, buying a used RV, like we all do, I would consider yourself lucky.

It also looks like soot has been accumulating for a long time. ...And it's amazing that the soot is so specific to only side of the turbo and surrounds the turbo evenly.

...And that tube on top is your oil-in tube that lubricates the turbo. ...But you have an exhaust leak for for sure with all that soot.

Note: Do you have black soot out your exhaust? ...When was the last time your air filter got changed?

Also, the last picture is my 2004 Itasca with a 2003-ISC-350 Turbo Holset40W and I have a Pac-Brake (exhaust brake). But now you can see what both sides of the turbo look like.

...And I can't help wondering if your waste gate actuator air is leaking exhaust?
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Old 06-02-2020, 11:39 PM   #12
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Jim I don’t have any better answers to your problem than has already been brought up. It was said for you to put your hand down by the turbo housing to see if you feel a leak. My suggestion would be to first remove the heat shield then fire it up and check for leaks around the turbo and the exhaust manifold. What I want to warn you of if you are not aware the turbo side where the exhaust runs through and the exhaust manifold gets very hot very quick so do not touch it with your hand while feeling for a leak. Considering where you suit is I’m thinking you may have an exhaust leak on the bottom of your exhaust manifold above the turbo compressor.

Just for a little more detail the turbo charger has two parts, first the rusty housing you see is the turbo where the exhaust gases pass through. The purpose of this is to turn the compressor side of the system (this is the dirty side with the suit all over it), this pulls air through your air filter and compresses it then forces it into the engine cylinders. This is what creates boost and helps your engine run more efficiently and in turn give you more power.
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Old 06-03-2020, 12:04 AM   #13
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It seems strange that the hot side has absolutely no black soot on it. Itís possible you have a very slow oil leak at the oil inlet nut by looking at your second last picture.
Soot wouldnít burn off the hot side like oil and dirt would.
Lightly rub your finger on the black stuff. Soot will be light almost powdery and hard to get off your finger where as old oil and dirt should be heavier.
Pretty hard to tell without being hands on.
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Old 06-03-2020, 10:28 AM   #14
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Thank you Gents for the suggestions and tips - I am new to Diesels, but otherwise mechanically competent.

The "soot" is soft and buttery to wipe off in that area with a Shop Wipe (I buy the tub of citrus wipes from Walmart).

I'll try these suggestions, namely the "tighten" the clamp" and see what changes come about, and also try to clean it up some so that I can tell where it comes back from.
Jim ����
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