Help with exhaust leak - Ford Powerstroke Diesel Forum

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post #1 of 6 Old 05-29-2012, 07:45 PM Thread Starter
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Help with exhaust leak

I have a 4" MBRP Turbo Back exhaust that I have no complaints with except for one small thing. The down pipe flange will no seal with my CAT flange. I have cleaned the CAT flange, removed the studs and use bolts, the flanges just don't mate flat. The cat delete pipe I have matches up perfect, but living in San Diego, I have to keep my CAT and would like to figure this out.

He is short video showing the gap at the flange and a small leak. Any ideas?
exhaust leak at cat flange - YouTube


Thanks

Dik
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post #2 of 6 Old 05-29-2012, 07:53 PM
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Dump the gasket and just use RTV high temp gasket maker. I used to have the same problem
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post #3 of 6 Old 05-29-2012, 08:02 PM Thread Starter
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What did you use and how does it hold up? My EGTs are around 600 at hiway speed.

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post #4 of 6 Old 05-29-2012, 09:34 PM
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High temp RTV silicone. It's held up fine for a few years. Had to replace it again at the beginning of the year because I moved it. Got it from Auto Zone.
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post #5 of 6 Old 05-29-2012, 09:35 PM Thread Starter
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post #6 of 6 Old 05-29-2012, 11:38 PM
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Ultra Copper hightemp RTV sealant.

1991 Ranger - 38" TSL's, 3 link, One tons, 5.38s on King air shocks....under construction.
1997 Ranger - reg cab flare side, 3.0L, M5OD-R1, 4x4, 31x10.50r15 MT's.
2008 F350 - Crewcab short bed, 6.4L diesel, H&S XRT Pro, AFE DOC/DPF delete
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