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11-23-2011, 11:29 PM
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Hummer Veteran
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Join Date: Nov 2011
Posts: 101
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Re: Exhaust Gasket leak and stud broke
At least the last bolt will have to be tightened at more than 18lbs, because like I said, at 18lbs, there was still a gap between the header and the manifold on that one... The only bolt I have overtightened now, is that last one, that is on the place of the broken one... Maybe if I tighten that one a little bit more, it will stop making the sound, I don't know 
I'm thinking like that because, if there was a gap at 18lbs, then maybe I haven't fully closed it at the torque I have on it right now, maybe a little more would close it good.
I'm afraid that it will brake with time, but if I don't overtighten that bolt, then I have a big gap that lets all the air out...
Last edited by cashville : 11-23-2011 at 11:31 PM.
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11-23-2011, 11:43 PM
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Hummer Authority
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Join Date: Oct 2003
Posts: 1,118
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Re: Exhaust Gasket leak and stud broke
The bolt should handle the extra torque because of the grade it is, guess it is worth a try.
Edit: max torque dry looks to be 24 to 27 foot pounds for a 8 mm 10.9 grade.
Good luck, Ed
Last edited by Easy Ed : 11-23-2011 at 11:48 PM.
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11-24-2011, 12:06 AM
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Hummer Veteran
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Join Date: Nov 2011
Posts: 101
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Re: Exhaust Gasket leak and stud broke
I'm not even sure at how much torque the last bolt is, because it's the only bolt with bad access, and my torque wrench wouldn't fit in that place. After the others I could get a feeling of the 18lbs, and put it around that, and I did but it was not enough to close the gap. After that I tightened it a lot, because a lot was needed for the header to go back into place with no gaps.
What I'm thinking of doing tomorrow, is do a leak test and spray some wd40 around the manifold (will start with the place where the broken bolt was), and see if I get a different engine idle, just to detect the leak and make sure it's really coming from that place.
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11-24-2011, 02:23 AM
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Hummer Veteran
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Join Date: Nov 2011
Posts: 101
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Re: Exhaust Gasket leak and stud broke
I couldn't wait till tomorrow, so I tightened the last bolt as much as I could, and turned on the engine. the noise was still there, so that didn't help. I then sprayed wd40, and noticed bubbling coming from the gasket at that last bolt. I turned off the engine, and unscrewed the last bolt a little, to not leave it there overtightened.
So, I guess I'm investing in a Felpro gasket. Lol.
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11-24-2011, 05:02 AM
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Hummer Veteran
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Join Date: Nov 2011
Posts: 101
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Re: Exhaust Gasket leak and stud broke
btw, I didn't put anything on the used gasket, I just took it out, and put it on again. Should I have used a sealant or something?
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11-24-2011, 06:05 AM
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Hummer Guru
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Join Date: Oct 2005
Location: Charlotte, NC
Posts: 2,767
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Re: Exhaust Gasket leak and stud broke
Be careful over tightening those bolts. You tighten them too much and you pull the studs clean out of that head. (aluminum)
Just a suggestion.
Mark
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11-24-2011, 06:08 AM
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Hummer Guru
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Join Date: Oct 2005
Location: Charlotte, NC
Posts: 2,767
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Re: Exhaust Gasket leak and stud broke
Btw, DO NOT REUSE THE GASKETS!!!
Mark
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