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BMW 3-Series (E90 E92) Forum
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n52 exhaust manifold gasket stuck in head
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05-09-2021, 01:57 AM | #1 |
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n52 exhaust manifold gasket stuck in head
Hey all,
I'm looking for advice for these crusty exhaust manifold gaskets. All 6 of them seem to be stuck in the cylinder head. I don't want to damage the head by prying too hard. If anyone has experience with this situation, please give me a shout. Kind of stuck atm... Thanks, - William
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05-09-2021, 09:17 AM | #2 |
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Yes mines were stuck in the head too. Get a flathead and start breaking them up. They're kind of soft metal ish sheets compressed together so they're easy to remove. You could also use a small flathead and pry them off from behind and reuse them if you don't beat them up too much.
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05-09-2021, 02:29 PM | #3 |
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+1 Work on them slowly prying piece by piece carefully.
From what I could tell, they are made of some bunched up very tin metal foil that is packed with pure carbon (like pencil lead carbon). If you poke on that directly but being careful not going through it all the way and not skipping and going into the head, they will start peeling and coming off. It gives you an appreciation of how carbon is considered a dry lubricant, it is really slippery once you start to get it on your gloves. |
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05-09-2021, 10:25 PM | #4 |
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Thank you guys!
With your replies and a bit of confidence, i used a chizsel and a pick set and got these bishes out.
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05-10-2021, 06:37 PM | #6 |
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Oh man. Well the one to the top left looks like it could still come out using I don't remember what it was I think an E6. The other you'll need vice grips for sure or some female extractor
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05-10-2021, 10:39 PM | #7 |
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Perhaps I will coat some of the new studs with high heat clear primer haha.
I think I'll have to use locking vice grips.
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05-11-2021, 08:34 PM | #8 |
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Having a few of the studs in the engine helped align the new manifolds when I installed them. Is there a reason you're taking them all out?
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05-12-2021, 08:01 AM | #9 | ||
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I think I left one or two real stubborn ones being afraid to break them off. Quote:
About alignment, you put the new replacements ones in after removing old ones, so they still would do that alignment job. |
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05-12-2021, 12:44 PM | #10 | |
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I'd say this bmw is holding up better than other chassis.
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05-14-2021, 10:04 AM | #11 | |
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Heat. You can also thread two nuts on to the threaded section and lock them together by tightening them against each other. Then put a wrench on the inner one to back it out. Personally I'd spray them with penetrating oil overnight and then try to use the two nut method before applying heat |
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05-14-2021, 04:58 PM | #12 | |
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05-14-2021, 06:21 PM | #13 |
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use copper or brass nuts on the studs when putting everything back together. old school trick I've seen on everything from Studebakers to VWs. Won't corrode just like stainless, but won't gall like stainless. If the stud swells from rust you can blow the nut off with a torch without harm. If you can find stainless studs so much the better, stainless plus brass = best combo for corrosion resistance in high heat environment.
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09-08-2022, 06:13 PM | #15 |
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So do you for real just break the gaskets up until there is nothing left? How did you make sure reminants of the gasket weren't going to obstruct the new ones?
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09-10-2022, 01:32 AM | #16 | |
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Quote:
Unfortunately for me, one of the studs snapped because I had to dremel off a stuck nut and I cut some of the stud by mistake, so I had to buy a stud extractor socket. Came out like butter with it. I also used it for a few other studs that were rounded out due to corrosion. Those I could've gotten out with the double nut method but I was lazy and figured I might as well use the tool since I bought it. |
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09-10-2022, 11:45 AM | #17 |
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I would just pry those gaskets out with a flathead screwdriver. it's not like it's a bearing surface or something, and the gasket is going to conform to the head and manifold anyway.
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