Broken Exhaust stud repair
 

Broken exhaust stud repair.



I had a cylinder head come to the shop, it had a bad drilled exhaust stud.
Whoever tried to remove the broken stud before, did not do the best of jobs.
Part of the old stud was still in the hole. Along with part of an EZ out.


https://www.miataturbo.net/attachmen...ine=1360289132

I took a die grinder with a carbide burr and ground out the stud and EZ out.
I was left with this for a hole., I knew a simple Heli-coil would not fix it.
https://www.miataturbo.net/attachmen...ine=1360289132

So I made a bushing to repair it.

The head casting was dilled and tapped for a ½ x 13.




https://www.miataturbo.net/attachmen...ine=1360289132

Next I installed a set screw. You could also use the threaded part of a bolt.

https://www.miataturbo.net/attachmen...ine=1360289132

Use “Green locktite”
https://www.miataturbo.net/attachmen...ine=1360289132

After about an hour, the locktite is set up. Drill the set screw .2660, then tap for 8mm x 1.25
https://www.miataturbo.net/attachmen...ine=1360289132

Next fit the stud.

https://www.miataturbo.net/attachmen...ine=1360289132

The customer should not have any exhaust alignment issues of the exhaust manifold now.

https://www.miataturbo.net/attachmen...ine=1360289132

:party:

Another bauce thread from a buace.

good job, looks good. Whenever i see part of an ez out/reverse drill stuck in the hole, i usually call it time of death.

Green loktite. Never heard of that. Properties?

Cool stuff. Thanks.

Green Locktite

tl;dr it wicks into small spaces

Wow. That's really cool. Thread penetrant with locking and sealing properties. Claims that the fasteners don't even need to be taken apart prior to application. I need me some of this.

Props to all!!

Well it is not loctite brand, but Permatex brand

Threadlockers : Permatex® Penetrating Grade Threadlocker GREEN

Loc-tite, for loc'd up machinists.

I normally use the green loctite for thread locker when using inserts.