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Posted by: motorvated Sep 13 2018, 05:57 PM

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.

Thanks, Mike

Posted by: Chi-town Sep 13 2018, 06:29 PM

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.

Posted by: motorvated Sep 13 2018, 07:08 PM

QUOTE(Chi-town @ Sep 13 2018, 06:29 PM)

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.

That's what I was thinking, none of the thread lockers would hold up to the heat. I have the copper nuts which seem to work well overall. I'd prefer if the nut would come off rather than the stud unscrewing, as I don't want to bugger up the threads in the aluminum head and have to go the time-sert or heliocoil route. Thanks for your advice.

Posted by: JamesM Sep 13 2018, 08:39 PM

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:

http://vwparts.aircooled.net/ACN-Flanged-Racing-Intake-and-Exhaust-Nut-8-x-10mm-p/acn-nuts.htm

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.

Posted by: TheCabinetmaker Sep 13 2018, 09:08 PM

I have the same feelings as James on the copper nuts. Won't use them

Posted by: injunmort Sep 14 2018, 04:52 AM

milk of magnersia on the threads

Posted by: Krieger Sep 14 2018, 07:22 AM

I used the copper plated nuts with antiseize on threads. No problems with removal on a tracked 6 cylinder.

Posted by: rhodyguy Sep 14 2018, 07:45 AM

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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