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  #1  
Old 08-11-2017, 08:41 PM
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Location: Benson, NC
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Sudden exhaust leak at hwy speed...lots of black smoke!

Soooo....I was driving down the interstate when all of a sudden the engine noise gets louder, she throws a some more power to the wheels, and the cars behind me got covered in my rollin' coal!

The exhaust is now leaking at the junction between the exhaust pipe and the turbo. I'm a little concerned about all the black smoke, though. Can anyone chime in to help ease my mind? I'm thinking the exhaust leak is causing the turbo to not force enough air into the intake causing it to be an over-fueling condition. It's either that, or I've REALLY screwed up somewhere!

Any advice is greatly appreciated!


Chris Dragotta
1991 300D OM602 Turbo
Benson, NC

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  #2  
Old 08-11-2017, 09:03 PM
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It seems odd that a leak there would cause black smoke. I wonder if you don't have an obstruction further down the exhaust system that increased the exhaust pressure causing it to find the weakest spot to start leaking.

This topic would probably get a better response in Diesel Discussion.
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  #3  
Old 08-12-2017, 12:48 AM
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Ahhhh!!! I was thinking the same thing! I had been wondering if my exhaust was blocked somewhere. Thank you for the confirmation.


Chris Dragotta
1991 300D OM602 Turbo
Benson, NC
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  #4  
Old 08-12-2017, 04:50 AM
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The leak may be in the flex section, which is near the top of the front pipe. If the turbo was sticking, the Alda would provide less fuel. It's possible that the turbo seal is bad, and is allowing engine oil to enter the turbine chamber. How is your oil consumption?
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Old 08-12-2017, 04:25 PM
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Yeah...I'm getting ready to rebuild the turbo today. I know it's blowing oil. However, the heavy black smoke didn't come until the exhaust leak made itself know. By the way, the leak IS in the flex section.


Chris Dragotta
1991 300D OM602 Turbo
Benson, NC
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  #6  
Old 08-12-2017, 05:47 PM
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Good luck finding parts. I just had this problem on my 190dt. The flex pipe is on worldwide backorder, no production scheduled. I managed to clamp the broken ends together with a strap clamp, still looking for a good front pipe.

Just a guess: the broken pipe lowered pressure in the turbine section, allowing more oil to leak into the exhaust.
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Old 08-12-2017, 06:19 PM
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Quote:
Originally Posted by Mxfrank View Post
Good luck finding parts. I just had this problem on my 190dt. The flex pipe is on worldwide backorder, no production scheduled. I managed to clamp the broken ends together with a strap clamp, still looking for a good front pipe.

Just a guess: the broken pipe lowered pressure in the turbine section, allowing more oil to leak into the exhaust.


Sounds plausible to me.


Chris Dragotta
1991 300D OM602 Turbo
Benson, NC

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