Took my exhaust off yesterday and one of the exhaust manifold studs unscrewed with the nut attached. The threads are good, so I shouldn't have a problem putting it back in. So my question is whether or not I should put some thread sealer on the stud when I screw it back in, and if so, should I use something like Locktite blue strong or red permanent thread sealer. I'm thinking the heat may make using thread sealer a mute point, so I'm asking the Brain Trust of the World for advice.
Most thread lockers will just burn off with a few exceptions that loc-tite makes and you don't want to use them in aluminum.
Are you using a locking nut or a nut with a lock washer? If it's a locking nut you may want to switch to a nut and lock washer to avoid this.
If the stud coming out doesn't hurt anything toss a little anti-seize on it to make sure it doesn't bugger up the threads going in or out and just make sure it's tight when reinstalled.
The copper lock nuts are great at pulling exhaust studs and never letting go. I have had to replace almost every stud I ever attempted to install them on. I wouldn't use them again if you paid me to!
These are my new go to for exhaust nuts:
Having the extra space is REALLY nice to keep your socket from jamming against the pipes and the 13mm flange is nice for multiple reasons. Was so happy when i found these.
I have the same feelings as James on the copper nuts. Won't use them
milk of magnersia on the threads
I used the copper plated nuts with antiseize on threads. No problems with removal on a tracked 6 cylinder.
Get a replacement stud. Not that long ago Len Hoffman noted not to use the copper nuts and simply double nut the stud and use a anti-seize product.
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