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  #1  
Old 05-27-2019, 09:05 PM
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Oil at Turbo/Downpipe Connection

I searched but couldn't find a thread about this, even though I'm sure it's been covered.

I was changing engine mounts this weekend and noticed I have a drop of oil on the bottom of the connection between the turbo and the downpipe. The car uses about a quart of oil between 3,000 mile changes, but a lot of that is from an abundance of small oil leaks in various places. What should I be checking?

Edit: I forgot some people have signatures turned off. It's the '83 300D with 359,000 miles in my sig.
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Anyone who thinks a 300D is fast drives too slow.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 359,xxx miles
08 Triumph Street Triple 26,xxx miles, lowered 10mm in front, Pirelli Angel GT tires, EBC HH brake pads, otherwise stock.
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Old 05-27-2019, 09:55 PM
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You mean the u shaped pipe between the air cleaner and the turbo?
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Current Diesels:
1981 240D (73K)
1982 300CD (162k)
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Past Diesels:
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  #3  
Old 05-28-2019, 12:29 AM
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Nope. On the exhaust side.
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Anyone who thinks a 300D is fast drives too slow.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 359,xxx miles
08 Triumph Street Triple 26,xxx miles, lowered 10mm in front, Pirelli Angel GT tires, EBC HH brake pads, otherwise stock.
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  #4  
Old 05-28-2019, 06:55 AM
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I’d suspect any oil there would burn readily. Also would suspect if it was a big deal you’d see the exhaust pipe at the end of the car wet, not just showing dry black soot.

Has the turbo ever been rebuilt?
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Current Diesels:
1981 240D (73K)
1982 300CD (162k)
1991 350SD (113k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)
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  #5  
Old 05-28-2019, 09:45 AM
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My commute is only 5 miles round trip, so maybe it isn't getting hot enough to burn the oil in that time. No rebuild on the turbo that I'm aware of.
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Anyone who thinks a 300D is fast drives too slow.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 359,xxx miles
08 Triumph Street Triple 26,xxx miles, lowered 10mm in front, Pirelli Angel GT tires, EBC HH brake pads, otherwise stock.
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  #6  
Old 05-28-2019, 11:12 AM
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Degrease the area and above it and locate exactly where the leak is coming from.

If you removed the Expansion Joint near the Trubo and look in side you should see flat black colored carbon. If the carbon is shiny/wet looking you are getting Oil from the Turbine Seal or the Oil is coming out of the Engine and getting into the Turbo.

If you find the shiny carbon removing the turbo will allow you to see if Oil is in the Exhaust Manifold as it will also have shiny carbon in it. If the Exhaust manifold has that dry carbon you know it is the Turbo that is leaking Oil.
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Old 05-28-2019, 11:16 AM
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Repair Links
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Old 05-29-2019, 07:47 PM
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Never mind. Air filter housing has a bunch of oil in it. That's where it came from. In other news, the engine mounts that I just changed took one day to collapse. Time to order more.
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Anyone who thinks a 300D is fast drives too slow.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 359,xxx miles
08 Triumph Street Triple 26,xxx miles, lowered 10mm in front, Pirelli Angel GT tires, EBC HH brake pads, otherwise stock.
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  #9  
Old 05-29-2019, 07:55 PM
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Check how bad your blow by is. What oil are you using?

I did a DIY on sealing the separator in the air cleaner.

What mounts did you use? I’d go Lemfoerder.
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Current Diesels:
1981 240D (73K)
1982 300CD (162k)
1991 350SD (113k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)
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  #10  
Old 05-29-2019, 10:08 PM
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Quote:
Originally Posted by Skippy View Post
Never mind. Air filter housing has a bunch of oil in it. That's where it came from. In other news, the engine mounts that I just changed took one day to collapse. Time to order more.
At the top of that skinny air filter oil separator drain tube is an O-ring. About in the middle of that drain tube is either a clamp with a single bolt or you have a tab with a hole welded on the tube with a bolt hole. That is below where the turbo mounts up on the Exhaust manifold there is a strap of metal with a hole for the bolt that is supposed to steady that clam or tab on the drain tube.

However, it either comes loose or where the tab is welded to the tube cracks. If the clamp is loose the tube is loose and it will leak.

At the bottom of the drain tube is a nipple which is part of the upper oil pan and that also has an O-ring.
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  #11  
Old 05-31-2019, 12:03 AM
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The mounts that went on were Meyle, and they'd been sitting on a shelf for quite a while. I have Lemfoerder on order.

Oil is 5W40 Rotella. I wouldn't be surprised if I'm missing an o-ring or two somewhere in oil separator territory. One more thing to look at when I get time.
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Anyone who thinks a 300D is fast drives too slow.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 359,xxx miles
08 Triumph Street Triple 26,xxx miles, lowered 10mm in front, Pirelli Angel GT tires, EBC HH brake pads, otherwise stock.
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