islade Posted January 30, 2011 Share Posted January 30, 2011 Hey guys, Just installed my new exhaust manifold. It's a stock one with external gate attached to it. Anyway, 11 studs are very happily installed. The one on the top row second from the rear somehow threaded out the hole it's supposed to go into. So i've installed it gently, but if i put any real pressure on it, it spins freely as i've obviously damaged the threads inside the hole. If all 11 others are attached securely, am I going to be okay, or is this going to be exhaust leak central? If it is a problem, how do i fix this? Thanks, Isaac Link to comment https://www.sau.com.au/forums/topic/352171-rb25-exhaust-manifold-installed-1-bolt-hole-threaded/ Share on other sites More sharing options...
The Mafia Posted January 30, 2011 Share Posted January 30, 2011 Exhaust leak central Where is the stripped hole? Go and get a helicoil kit, and repair it. Its piss easy to do. Just make sure you have a practice somewhere if you haven't done it before. Also, you might even be able to do it where it is without taking the manifold off. Link to comment https://www.sau.com.au/forums/topic/352171-rb25-exhaust-manifold-installed-1-bolt-hole-threaded/#findComment-5647328 Share on other sites More sharing options...
JonnoHR31 Posted January 30, 2011 Share Posted January 30, 2011 aslong as both the manifold and head are straight and clean then it'll be fine, and given the top row is pretty easy to get to with a standard manifold anyway it cant hurt to see how it goes. Link to comment https://www.sau.com.au/forums/topic/352171-rb25-exhaust-manifold-installed-1-bolt-hole-threaded/#findComment-5647600 Share on other sites More sharing options...
The Dan Posted January 30, 2011 Share Posted January 30, 2011 aslong as both the manifold and head are straight and clean then it'll be fine, and given the top row is pretty easy to get to with a standard manifold anyway it cant hurt to see how it goes. You can't be serious? It's going to leak no matter how flat both surfaces are. Not straight away, but eventually. Then it destroys a gasket, and other studs that cop the heat from it. Do it once, do it properly. Helicoil as suggested above Link to comment https://www.sau.com.au/forums/topic/352171-rb25-exhaust-manifold-installed-1-bolt-hole-threaded/#findComment-5647699 Share on other sites More sharing options...
JonnoHR31 Posted January 30, 2011 Share Posted January 30, 2011 so all the hundreds of standard cars driving around with 3-4 studs fallen out with no leaks are miracles? its a thick cast iron manifold, its not gonna bend from 1 missing stud Link to comment https://www.sau.com.au/forums/topic/352171-rb25-exhaust-manifold-installed-1-bolt-hole-threaded/#findComment-5647720 Share on other sites More sharing options...
The Dan Posted January 30, 2011 Share Posted January 30, 2011 so all the hundreds of standard cars driving around with 3-4 studs fallen out with no leaks are miracles? its a thick cast iron manifold, its not gonna bend from 1 missing stud Didn't say the manifold was going to bend. It's going to leak though. And the studs fallen out of hundreds of standard cars is because the gasket is leaking, causing the hot gases to pass over the stud. If he puts this all back together without fixing it while it's close, then it WILL leak, it's only a matter of time....and from what I have seen, no more than about 3 months depending on what he does with the car Link to comment https://www.sau.com.au/forums/topic/352171-rb25-exhaust-manifold-installed-1-bolt-hole-threaded/#findComment-5647743 Share on other sites More sharing options...
islade Posted January 30, 2011 Author Share Posted January 30, 2011 Cool I don't think it's worth "seeing how it goes" because the inconvenience of removing everything again overpowers the "pay some mobile dude $88 to come fix it for me tomorrow) Words stupidest question, but with the studs, does the "long threaded end" or "short threaded end" go into the head? Link to comment https://www.sau.com.au/forums/topic/352171-rb25-exhaust-manifold-installed-1-bolt-hole-threaded/#findComment-5647772 Share on other sites More sharing options...
JE-R33GTS-T Posted January 30, 2011 Share Posted January 30, 2011 Haha I like it! I'm the same I'll give it a chop and have a go if I don't think I'll stuff anything expensive after a bit of reading but I have no probs calling someone to fix it Link to comment https://www.sau.com.au/forums/topic/352171-rb25-exhaust-manifold-installed-1-bolt-hole-threaded/#findComment-5647798 Share on other sites More sharing options...
JE-R33GTS-T Posted January 30, 2011 Share Posted January 30, 2011 (edited) As for studs I had one stuck in with loctite from the previous owner haha no wonder the back two cylinders had no exhaust gasket left I pulled the stud out with my fingers Edited January 30, 2011 by JE-R33GTS-T Link to comment https://www.sau.com.au/forums/topic/352171-rb25-exhaust-manifold-installed-1-bolt-hole-threaded/#findComment-5647809 Share on other sites More sharing options...
JonnoHR31 Posted January 30, 2011 Share Posted January 30, 2011 Cool I don't think it's worth "seeing how it goes" because the inconvenience of removing everything again overpowers the "pay some mobile dude $88 to come fix it for me tomorrow) Words stupidest question, but with the studs, does the "long threaded end" or "short threaded end" go into the head? short end goes into the head Link to comment https://www.sau.com.au/forums/topic/352171-rb25-exhaust-manifold-installed-1-bolt-hole-threaded/#findComment-5647836 Share on other sites More sharing options...
Smegul Posted January 30, 2011 Share Posted January 30, 2011 You can't be serious? It's going to leak no matter how flat both surfaces are. Not straight away, but eventually. Then it destroys a gasket, and other studs that cop the heat from it. Do it once, do it properly. Helicoil as suggested above what? I have 2 broken studs and have never had a leaking problem??? Link to comment https://www.sau.com.au/forums/topic/352171-rb25-exhaust-manifold-installed-1-bolt-hole-threaded/#findComment-5648081 Share on other sites More sharing options...
snozzle Posted January 31, 2011 Share Posted January 31, 2011 an old r33 gtst of mine had a broken stud and didnt leak from the cylhead/manifold gasket at all for the 5-6 months i had it guess i was lucky Link to comment https://www.sau.com.au/forums/topic/352171-rb25-exhaust-manifold-installed-1-bolt-hole-threaded/#findComment-5649768 Share on other sites More sharing options...
islade Posted February 1, 2011 Author Share Posted February 1, 2011 I got "mobile threadfix" to helicoil it yesterday afternoon. The guy was very friendly and did an awesome job! Should be putting the manifold back on tonight, hopefully now without issue Link to comment https://www.sau.com.au/forums/topic/352171-rb25-exhaust-manifold-installed-1-bolt-hole-threaded/#findComment-5650003 Share on other sites More sharing options...
Beer Baron Posted February 1, 2011 Share Posted February 1, 2011 well done. yeah some of those mobile thread repair dudes are awesome. hands like a surgeon! lol. Link to comment https://www.sau.com.au/forums/topic/352171-rb25-exhaust-manifold-installed-1-bolt-hole-threaded/#findComment-5650192 Share on other sites More sharing options...
l0WRB Posted February 1, 2011 Share Posted February 1, 2011 good 2 hear mate! just remember when u line dump/wastegate setup up its a bit of a c.unt lol cause wastegate is plumbed in its all a very snug fit. Link to comment https://www.sau.com.au/forums/topic/352171-rb25-exhaust-manifold-installed-1-bolt-hole-threaded/#findComment-5650481 Share on other sites More sharing options...
islade Posted February 1, 2011 Author Share Posted February 1, 2011 Cool, if it's too hard, that's a sign from the gods to chop the pipe off and go screamer style Link to comment https://www.sau.com.au/forums/topic/352171-rb25-exhaust-manifold-installed-1-bolt-hole-threaded/#findComment-5650484 Share on other sites More sharing options...
89CAL Posted February 1, 2011 Share Posted February 1, 2011 you'll probably find that the cars that have broken a stud over time may or may not have a leak due to being on the car for hundreds of hot/cold cylces were the gasket has bonded slightly to the head and manifold. It's a bit hit and miss, I had 1 broken stud and didnt have any exhaust leaks but others might not be so luc Link to comment https://www.sau.com.au/forums/topic/352171-rb25-exhaust-manifold-installed-1-bolt-hole-threaded/#findComment-5650529 Share on other sites More sharing options...
89CAL Posted February 1, 2011 Share Posted February 1, 2011 (edited) you'll probably find that the cars that have broken a stud over time may or may not have a leak due to being on the car for hundreds of hot/cold cylces were the gasket has bonded slightly to the head and manifold. It's a bit hit and miss, I had 1 broken stud and didnt have any exhaust leaks but others might not be so lucky. With a new gasket as said above, this will not work as the gasket will leak pretty quickly Edited February 1, 2011 by 89CAL Link to comment https://www.sau.com.au/forums/topic/352171-rb25-exhaust-manifold-installed-1-bolt-hole-threaded/#findComment-5650530 Share on other sites More sharing options...
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