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Stud Problem

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gsm187

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I was finally starting to feel a little confident that I could handle some of the repairs on my 'new' '80 B. After removing the hoses, ZS carb and such to gain access to the exhaust/intake manifold, I was able to gain access to the nut behind the converter and secure all three needed to attach the catalytic converter to the manifold. One of the studs was in bad shape, so I swapped it out with a new one from Moss. Reinstalled everything and all was well. Took the car for it's first run around the block. After I stopped patting myself on the back, I went in to get my wife and take her for that long awaited ride (I got the car 22 May). When I started the car up, the exhaust from under the hood choked out the engine....just what I had undertaken to fix! It seems that the new stud I had installed backed out of the manifold and was allowing exhaust to pour into the engine compartment. What I need to know (what I should have known before) is how to secure new studs in the manifold without damaging the threads. I thought I tightened them as much as possible, but obviously I hadn't. Any thoughts out there. I need to get that feeling back. /ubbthreads/images/graemlins/wink.gif Thanks! Gary
 
Were the nuts from Moss sold for that purpose like the studs were? This is only a guess but if they were of not right maybe they could expand too much and loosen that way.
The only time I have had a problem like that is when I substituted a bolt for a stud and couldn't keep them tight no matter how I tried. Went down to get the proper studs and nuts and had no more problems.
Bob
 
GSM I can not justify your problem with the stud.However, there are several ways to insure that one is tightened properly. The most common DIY technique is to counter Lock a couple of nuts on to the stud and tighten it down securely. Another is if there is an unthreaded part of the stud available ,lock a set of vice grips on to it and torque it down.Preferaly there is a tool for installing and tightening studs down.---Fwiw---Keoke
 
I use the trick keoke mentioned with the two locknuts. Works like a charm. Just make sure you put some type of hi-temp anti-seize compound on those studs. They have a way of corroding in place. Also consider using brass nuts to hold the downpipe on to prevent stuck nuts / broken studs later. As we all know, it's bad when your nuts get stuck.
 
Thanks guys. I do have the brass nuts that came with the studs from Moss. I'll try the double nut trick with the anti-seize compound, and hope my next issue (there's always a next issue I'm finding) is just as easy to address.
 
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