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2014 Mercedes Bnez GL500, 2016 Mercedes Benz CLA45 AMG
Exhaust and Header Question
OK, possible the easiest question I have ever asked, but just wanted to be 100% sure
Are there supposed to be nuts on these bolts going through exhaust downpipe flange and through flanges on headers/manifold?
The reason why I ask is that I was actually thinking that I had an exhaust leak at the flanges (and I might still have), but after I took the picture I also noticed a crack in the weld of the headers. Is there a torque spec on these bolts?
2014 Mercedes Bnez GL500, 2016 Mercedes Benz CLA45 AMG
Originally Posted by new55
what headers are they ? do you have flex pipes or why did they crack ?
Evosport headers. No flex, which is probably why they cracked. I had a guy put in motor mounts 6 months ago, but never really checked the exhaust after the repair. I think perhaps this is where the bolts went missing and the mis-alignment of the flanges certainly could create enough force to crack at the weld. I'm debating whether to "putty" fix or take off the entire header(s) for repairs.
I would still like to know the PN for the bolts though. I can't seem to find them online and I have lost EPC access
2014 Mercedes Bnez GL500, 2016 Mercedes Benz CLA45 AMG
Originally Posted by VictoryRoadPerformance
It looks like the Exhaust manifolds are threaded, replacing the need for a nut, Id imagine if they werent threaded your bolt would be MIA by now.
Well, I sorta figured that the manifolds were threaded, but also figured that perhaps a bolt was still needed. Does anyone know if stock exhaust to manifold has nuts? Does anyone have an exploded diagram?
Yeah i was looking at it backwards i think phil an the other guy are right no nut needed ..... looks like it just threads into the manifold no nut needed just take it off to fix the crack dont half *** it ...... besides.may find more once its off
2014 Mercedes Bnez GL500, 2016 Mercedes Benz CLA45 AMG
True. I'll do it right. I have an ever so slightly leak at my valve cover, I might combine everything at that point anyway.
I also just found out that the flange off the exhaust portion from O2 Sensor has a built-in gasket, and I assume this gasket allows for some alignment with flange of manifold, which perhaps is why the 2 flanges are not completely mated?
personally if you have the mon ey id ditch the short tubes and get your self some nice long tubes and enjoy the extra power, better sound, and higher quality haha but not always the best way to go for some
2014 Mercedes Bnez GL500, 2016 Mercedes Benz CLA45 AMG
The MBH headers are certainly nice, however not sure how much I would gain from my current Evosport. And it always comes down to ROI, and having several vehicles to throw money at, this might not be the time for further mods to this E. haha
There would be some discoloration at the weld cracks if it were leaking, looks like you caught it early enough before to be a problem.
It has been said already that after flow testing of stock manifolds versus evosport the gains were very very minimal and not enough according to some to justify the cost and effort of replacement.
2014 Mercedes Bnez GL500, 2016 Mercedes Benz CLA45 AMG
OK, I got both my headers out. A very time-consuming task. Not necessarily looking forward to putting them back in.
My new concern is aligning the header and cat pipe better than before to avoid this again in the future. Is there something I can use between the mating surfaces to ensure leak tight fit without having to stress the headers? Is there a flexible gasket that would work or something else?
no such thing as a flexible gasket. there are half circle gaskets that seal weird angle or not flat surfaces to one another. if a gasket were to flex it would leak.
what you would be looking at is a flex pipe. you'd need to add a flex pipe to your down pipes if you wanted to alleviate this from occurring again. or just pickup some long tubes as i don't recall any long tubes cracking.
2014 Mercedes Bnez GL500, 2016 Mercedes Benz CLA45 AMG
Originally Posted by hachiroku
no such thing as a flexible gasket. there are half circle gaskets that seal weird angle or not flat surfaces to one another. if a gasket were to flex it would leak.
what you would be looking at is a flex pipe. you'd need to add a flex pipe to your down pipes if you wanted to alleviate this from occurring again. or just pickup some long tubes as i don't recall any long tubes cracking.
I thought about the flex pipe addition, but I just want something to be easy for once.. lol
I thought about the flex pipe addition, but I just want something to be easy for once.. lol
in the long run the flex pipes make it easier with alignment of headers/mid pipes/ cracking from vibration, flex from motor/mount torqueing etc,,, but its just not as simple as tightening a bolt with a new gasket
just replace those headers with those Taiwanese/eBay cheapo shorties. they are shorties and you shouldn't see to bad of a flow difference. if they crack again who cares, they're cheap to replace.
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