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Long Tube Header Exhaust Leak

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Old Apr 15, 2018 | 12:55 PM
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layzie12g
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2008 Mercedes Benz E63
Long Tube Header Exhaust Leak
What are you guys using to seal the connection at the collector? I have MBH long tubes and have never been able to get the clamps to seal. There has always been quite a large leak on both sides and I have the exhaust pushed in as far as it can go. I just saw people are using an exhaust putty, but it sounds like it turns in to JB Weld. Any tips would be appreciated. The right way would be to use V bands, but I do not want to remove the headers.
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Old Apr 15, 2018 | 01:02 PM
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'16 CLS63S
Originally Posted by layzie12g
What are you guys using to seal the connection at the collector? I have MBH long tubes and have never been able to get the clamps to seal. There has always been quite a large leak on both sides and I have the exhaust pushed in as far as it can go. I just saw people are using an exhaust putty, but it sounds like it turns in to JB Weld. Any tips would be appreciated. The right way would be to use V bands, but I do not want to remove the headers.
I have weistec headers which Im told are the same as MBH just rebranded. I havent had any leaks using the clamps that came with the headers. There were slight leaks when they were tightened by hand but after I hit them with a impact wrench it sealed up fine
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Old Apr 15, 2018 | 01:16 PM
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After I installed mine I went to re-tighten them and ended up breaking one of the through bolts. I'm going to take a look again tomorrow and decide what to do. Also I'm going to have an H added in to my straight pipe instead of an X. It will be an easier process.
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Old Apr 15, 2018 | 01:22 PM
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Cant say with certainty but I believe I used permatex cooper also.

https://www.amazon.com/dp/B0002UEOPA/ref=cm_sw_r_other_apa_PM40AbMEQJ6E5
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Old Apr 15, 2018 | 01:52 PM
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I'll give that a try tomorrow.
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Old Apr 15, 2018 | 02:05 PM
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Originally Posted by layzie12g
I'll give that a try tomorrow.
Get it nice and clean with some brake cleaner etc, and put a coat of the high-temp Permatex on both surfaces. Allow it to fully dry and you should be good. Pretty easy to dissemble as well when needed.
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Old Apr 15, 2018 | 03:43 PM
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Originally Posted by bentz69
Cant say with certainty but I believe I used permatex cooper also.

https://www.amazon.com/dp/B0002UEOPA..._PM40AbMEQJ6E5
That’s good stuff. Make sure to follow the directions to a T and allow ample drying time before starting up the car again.
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Old Apr 15, 2018 | 06:05 PM
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The fact that is a slip fit is going to smear the hell out of the sealant. I was also thinking about using it where the clamp goes.
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