Exhaust manifold Stripped?

[lab2370]

09 Legacy. Went to check the exhaust manifold for leaks and found one of the studs on the drivers side was loose. Pulled the stud and the top 3 threads of the stud came out filled with the thread, or maybe a helix coil insert? Not sure since I got it used.

When I go to put the stud back in the stud starts to tighten but never fully does and when I try to tighten the nut it ends up just backing the stud out before ever reaching torque spec. I assume the threading must be stripped in the head, is that correct? If so how do I make it so I can tighten the manifold enough to prevent leaks?

 

[Valpo Subbie]

Replace the stud. You will need a stud extractor to remove it which is about $20 from Autozone

 

[lab2370]

Replace the stud. You will need a stud extractor to remove it which is about $20 from Autozone

Sorry apprently I wasn't clear. The stud came out just fine. Some of the internal threads from the block came out still wrapped around the stud. And I always replace studs when I pull them out just as precaution.

 

[Valpo Subbie]

Have you considered a Helicoil kit for it? You can also possibly upsize the stud slightly and just drill the manifold hole slightly larger

 

[Dick Foster]

There are tread repair inserts called helicoils. It involves drilling out the hole, retapping and then installing the helicoil insert.

 

[Wolfy4Me]

There are tread repair inserts called helicoils. It involves drilling out the hole, retapping and then installing the helicoil insert.

Same answer by Valpo Subbie earlier today.