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6.4L Power Stroke Engine and Drivetrain Discussion of the 6.4L Power Stroke diesel engine and drivetrain in the 2008-Up Super Duty trucks. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.4L Power Stroke engine.

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Old 11-25-2012, 06:07 PM   #1 (permalink)
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Exhaust leak under hood?

Any suggestions on why all of a sudden I could have an exhaust leak under the hood of my 08 f250 112k coming from behind the turbo at the fire wall somewhere hard to see exactly where at. Could it be the up pipe or do you all think its something else . Just happened all at once sounds like a jet under my hood.
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Old 11-25-2012, 06:11 PM   #2 (permalink)
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Jet under the hood...Still have boost?

Jet sounds usually mean one of the boots came off.
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Old 11-25-2012, 06:23 PM   #3 (permalink)
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Still have plenty of boost just slower to get there 30 psi easy
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1999 F250 Lariat, 4X4 extended cab short bed, 6 pos ts chip, 6in homemade straight pipe, k&n filter

94.5 F250 6 pos ts chip, 4 in straight exhaust into flat black 6 in stacks, cone air filter,3in downpipe,beans stage 1's-sold
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Old 11-25-2012, 06:37 PM   #4 (permalink)
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I'd check all of your boots then and see if you identify what is leaking
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Old 11-25-2012, 06:47 PM   #5 (permalink)
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Can you see any soot at the back of the engine compartment? If not then its unlikely its an exhaust leak.
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Old 11-25-2012, 07:27 PM   #6 (permalink)
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Black smoke coming up from below turbo at the firewall
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1999 F250 Lariat, 4X4 extended cab short bed, 6 pos ts chip, 6in homemade straight pipe, k&n filter

94.5 F250 6 pos ts chip, 4 in straight exhaust into flat black 6 in stacks, cone air filter,3in downpipe,beans stage 1's-sold
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Old 11-25-2012, 07:33 PM   #7 (permalink)
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misaligned pipes then I'd say.
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Old 11-25-2012, 08:07 PM   #8 (permalink)
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Can pipes just come aligned all of a sudden like that? And which pipe would it be?
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1999 F250 Lariat, 4X4 extended cab short bed, 6 pos ts chip, 6in homemade straight pipe, k&n filter

94.5 F250 6 pos ts chip, 4 in straight exhaust into flat black 6 in stacks, cone air filter,3in downpipe,beans stage 1's-sold
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Old 11-25-2012, 08:41 PM   #9 (permalink)
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The downpipe that leads to the exhaust would be the one.
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Old 11-25-2012, 09:25 PM   #10 (permalink)
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The bellows I believe they are called are sometimes the culprit. Someone could correct me if I have the wrong name for them.
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Old 11-26-2012, 01:37 PM   #11 (permalink)
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exhaust leak - YouTube
Heres a video of the sound. I put my hand in there and couldnt feel any hot air.
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1999 F250 Lariat, 4X4 extended cab short bed, 6 pos ts chip, 6in homemade straight pipe, k&n filter

94.5 F250 6 pos ts chip, 4 in straight exhaust into flat black 6 in stacks, cone air filter,3in downpipe,beans stage 1's-sold
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Old 11-28-2012, 08:01 AM   #12 (permalink)
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I'm guessing the uppipes, they hook to the exhaust manifolds and go to the turbos. Diesel Power just did the 10 worst problems for the 6.4 and this was one of them. They showed a pic of the uppipe, it has a 90 bend in it to get the exhaust to the turbo, the metal fatigues and stretches, and blows out. Their best fix was to get 6.0 exhaust manifolds they already has a 90 bend cast into them. Or just replace the uppipes and wait till it happens again.
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Old 11-29-2012, 06:22 AM   #13 (permalink)
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i agree, its the bellows. i just replaced mine with a tripple wall version that is supposed to last longer.
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Old 11-29-2012, 09:17 PM   #14 (permalink)
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This is something you can do with the cab in place?
Joe
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Old 11-29-2012, 10:04 PM   #15 (permalink)
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Yes. Drop the trans crossmember, the down pipe and lower the rear of the trans. Still sucks though. IT is a little easier with the trans out. You can properly torque the fasteners then. Only takes a couple hours to take the trans out and back in. But then again, it doesnt take all that long to take the cab off.
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