Stripped exhaust head stud

[Chlngrcrzy]

Went to hang my headers on my rebuild and realized i had one exhaust stud missing. Found a replacement and went to install it     Now why couldnt my engine builder warn me i had a stripped hole?
And why couldnt he have repaired it!!! i paid enough to get the darn thing rebuilt. Okay enough ranting or whining.
Besides replacing the heads, what is my next option for repair? Can you use a hell-coil repair on the head? i realize it has to seal very well, because of the coolant behind it. The stud will go in and hold, it just wont tighten down. Can i put something on the threads and let it set up before i install header and tighten down thew nut? The stud is located at the front driver side.

[Chryco Psycho]

Timesert , it will seal far better than a Helicoil
 I would be choked at the machinist as well , , I bet you have to pull the head off to fix it

[Strawdawg]

if you use a helicoil, you will have to coat it with some sealer before you screw it in....should work then

But, the timesert is a surer thing

[Topcat]

Heres a possiblity.

http://media.midwayusa.com/pdf/reference/loctite_stripped_threads.pdf

[Chlngrcrzy]

Heres a possiblity.

http://media.midwayusa.com/pdf/reference/loctite_stripped_threads.pdf

It is defiantly worth a try. Nothing to lose, otherwise it is hell-coil time.

[moparmaniac59]

When you say the stud will go in & not tighten down, what exactly do you mean? Does the stud have a shoulder on it? If it's a thru hole, (and if it goes into the water jacket, then it is a thru hole) and the stud has a continuous thread, then it won't get tight, but just keep turning in. A proper header stud should have a shoulder approx. in the middle of the stud and it should screw in until it reaches the shoulder where it should bottom out and get tight. What type of stud are you using? The machinist in me is curious?  My point being is that there may not be anything wrong with the bolt hole depending on what type of stud you are using.

                                                                                Matt B.

[HP_Cuda]

I guess it will be too much of a pain in the butt to have bolts as you will most likely have leaks because of the mopar head design.

No wonder folks assemble everything on the kmember instead of dropping it in from above as a buddy of mine said putting headers on his 70 Cuda was the biggest pain with studs.

[Chlngrcrzy]

It's the correct stud, the threads are screwed up in the head. You can thread it in all the way and it just keeps turning once you get it in. I have tried part way in, but it still breaks loose when you try to tighten the nut down on the header flange.

[brads70]

Depending on where it is could you just drill and tap for the next bigger size? 7/16? and then use a bolt?

[cudabob496]

Time-Sert video:


http://www.bing.com/videos/search?q=how+use+timesert&mid=95749902AACFAC60B05395749902AACFAC60B053&view=detail&FORM=VIRE2

[nqkjw]

Depending on where it is could you just drill and tap for the next bigger size? 7/16? and then use a bolt?

That's what I'd do.Or something similar.

[Chryco Psycho]

You will probably have to enlarge the hole in the header flange for a larger bolt &  if it is ceramic caoted it could start rusting there

[moparmaniac59]

If you decide to drill/tap it out, try using a little vasoline (petroleum jelly) on your drill bit and tap. The shavings/chips will stick to it and it will keep the metal shavings from going into your water jacket! 


                                                                        Matt B.

[Chlngrcrzy]

After visiting with our mechanics at the farm shop, i decided to go ahead and use a helicoil kit to fix it. i have nothing to lose at this point. if i fail at that then i will just pull the head and take it to a machine shop. i am sure lucky that it is the one in the front and easy to get too. i like the vaseline idea, our mechanic said to use a little grease to do the same thing. He said to be slow and patient with tapping. Not sure thats me, but what the heck.

[cudabob496]

After visiting with our mechanics at the farm shop, i decided to go ahead and use a helicoil kit to fix it. i have nothing to lose at this point. if i fail at that then i will just pull the head and take it to a machine shop. i am sure lucky that it is the one in the front and easy to get too. i like the vaseline idea, our mechanic said to use a little grease to do the same thing. He said to be slow and patient with tapping. Not sure thats me, but what the heck.

Think in the future I will try Time-Serts over heli-coils.