: Broke the stud..



6 SPEED Z
03-09-12, 12:59 PM
Where the exhaust hooks up to the cat. Can that stud coming out of the cat be changed, or does the cat need to be replaced, so much for a quick diff bushing change!!

darkman
03-09-12, 01:18 PM
Those studs are threaded on both ends and are replaceable. Any auto store that carries Dorman hardware should be able to match it pretty close. In fact, once the old one is out any nut and bolt combination that holds it together will work.

6 SPEED Z
03-09-12, 01:45 PM
Ok yea U was noticing they have a shoulder on them looks like they can be removed, might try a little heat to get them out. The bolts were soaked with PB Blaster since they are original, pass side came off no prob. Thanks Darkman, never leave the V world, us meer mortals world be lost in V doom, lol.

----------


Those studs are threaded on both ends and are replaceable. Any auto store that carries Dorman hardware should be able to match it pretty close. In fact, once the old one is out any nut and bolt combination that holds it together will work.


While you are here, what about a donut/collector gasket, the one on the cat where the exhaust seals, while I am down there, it is any standard, looks like 3 in donut, or some special V part??

darkman
03-09-12, 02:11 PM
I looked through an auto parts store catalog (O'Reillys) and Rock Auto and I do not see any direct listing nor indirect listing (universal parts) that look like that cat to pipe gasket.

killernoodle
03-09-12, 02:30 PM
I replaced mine with nuts and bolts. The studs get rusty, get stuck, get brittle, and eventually break. If a bolt breaks, you don't have to drill it out or anything, just put a new one in

6 SPEED Z
03-09-12, 02:40 PM
I replaced mine with nuts and bolts. The studs get rusty, get stuck, get brittle, and eventually break. If a bolt breaks, you don't have to drill it out or anything, just put a new one in


Did you drill the hole where the threads are in the cats for a bolt, or just thread a bolt in and put a nut on it, I got one out, some heat and some choice words and a pair of vise grips.

----------


I looked through an auto parts store catalog (O'Reillys) and Rock Auto and I do not see any direct listing nor indirect listing (universal parts) that look like that cat to pipe gasket.

On my 91 Z with the SLP headers/y-pipe I use a mid 70's Gm truck donut gasket, 3 in I think, and it works well. So it might just be whatever size the donut is on the V, 2.5 in maybe.

killernoodle
03-09-12, 02:41 PM
I had to use a blue wrench (torch) to get the studs out because I had 2 shear off flush with the flange. I couldn't get a drill bit to bite on the brittle material, so I ended up just burning a hole through the stud and sliding a nut and bolt through.

Slithering_Joe
03-10-12, 11:38 AM
Here's how the Caddy dealership replaced mine when they installed a new starter under warranty:

http://i189.photobucket.com/albums/z130/Slithering_Joe/My%202005%20CTS-V/RoyalCadillacHomeDepot1.jpg
Chain store quality, galvanized, smaller than original stud.


http://i189.photobucket.com/albums/z130/Slithering_Joe/My%202005%20CTS-V/RoyalCadillacHomeDepot2.jpg
Torque it tight enough did we?

http://i189.photobucket.com/albums/z130/Slithering_Joe/My%202005%20CTS-V/IMG_0748.jpg
I replaced with stainless steel and the same size as the original stock stud.

As killernoodle says, if nut/bolts break or rust out no drilling needed.

6 SPEED Z
03-11-12, 08:46 AM
Here's how the Caddy dealership replaced mine when they installed a new starter under warranty:

http://i189.photobucket.com/albums/z130/Slithering_Joe/My%202005%20CTS-V/RoyalCadillacHomeDepot1.jpg
Chain store quality, galvanized, smaller than original stud.



http://i189.photobucket.com/albums/z130/Slithering_Joe/My%202005%20CTS-V/RoyalCadillacHomeDepot2.jpg
Torque it tight enough did we?

http://i189.photobucket.com/albums/z130/Slithering_Joe/My%202005%20CTS-V/IMG_0748.jpg
I replaced with stainless steel and the same size as the original stock stud.

As killernoodle says, if nut/bolts break or rust out no drilling needed.



Yea I was lucky on one, got the stud out, the upper, not so, it snapped off almost flush with the cat flange, used a smaller carbide drill bit and some cutting fluid to drill through the broken stud in the hole then a 3/8 carbide bit to clean the hole out and used all stainless hardware to get back together.

----------


I looked through an auto parts store catalog (O'Reillys) and Rock Auto and I do not see any direct listing nor indirect listing (universal parts) that look like that cat to pipe gasket.


I used a Fel-Pro '58-'95 big block truck collector gasket from a local parts store, looks the same and seems to fit with a little bit of work. I sanded the flanges down just to clean them up, and everything bolted up fine. And they were only like 3.50 for both.

----------


Yea I was lucky on one, got the stud out, the upper, not so, it snapped off almost flush with the cat flange, used a smaller carbide drill bit and some cutting fluid to drill through the broken stud in the hole then a 3/8 carbide bit to clean the hole out and used all stainless hardware to get back together.

----------




I used a Fel-Pro '58-'95 big block truck collector gasket from a local parts store, looks the same and seems to fit with a little bit of work. I sanded the flanges down just to clean them up, and everything bolted up fine. And they were only like 3.50 for both.


Here is a pic, looks pretty close to me and they do fit the flange and bolt back together fine, Darkman might have something to say but I have no Caddie dealer in the local area to get a factory replacement part.


http://i1007.photobucket.com/albums/af198/aerostar602/DSC01467.jpg

http://i1007.photobucket.com/albums/af198/aerostar602/DSC01475.jpg

http://i1007.photobucket.com/albums/af198/aerostar602/DSC01477.jpg

http://i1007.photobucket.com/albums/af198/aerostar602/DSC01483.jpg

darkman
03-11-12, 12:17 PM
Here is a pic, looks pretty close to me and they do fit the flange and bolt back together fine, Darkman might have something to say but I have no Caddie dealer in the local area to get a factory replacement part.

It is just plumbing - if it works, it works.

6 SPEED Z
03-11-12, 01:57 PM
It is just plumbing - if it works, it works.

Yea very true, it was local and the car is all back together, and I will post a few pics with the new gasket installed also.

CTSV_Rob
03-11-12, 05:49 PM
Serious amount of rust, I sure am glad to have a SST exhaust from the heads all the way back to the tips.

Holy shit that is what my bushing looks like. I have a B&B exhaust on mine and when I dropped the exhasut I noticed that all four gaskets were leaking. I found some gaskets that will compress up to 50% on the high spots so I gave them a try and my car seems to be exhaust leak free.

They don't fit perfectly, the bolt hole is slightly smaller and a little too narrow but you can message them to make them work. The OD and the ID are a good fit and it made it easy to get the exhaust installed and leak free.

http://www.rallysportdirect.com/catalog_photos/products/remflex/rmf_rf8006_1_lg.jpg

I don't think my car has ever been this solid, even new. I didn't notice a difference in the noise, as a matter of fact it may have been quieter than before (Probably because of the exhaust leaks). I already had Urethane trans and motor mounts so these just may be louder and drowning out the diff mount, lol.

Shifting the car and accelerating is a dream now, I had to slip the clutch and ease into the throttle or "CLUNK" but this is gone now. The car is a blast to drive again.

6 SPEED Z
03-11-12, 10:50 PM
Yea ditto on the fun factor, totally transforms the car, also excelerates in a straight line it seems, rear feels much more planted, and that GOD awful clunk is gone, I used the diff block also and have not noticed any noticabe noise or vibes, should of done it years ago.

Yea some rust but it is all stock and staying that way till they fail.

EdmundGTP
03-12-12, 05:19 PM
WOW that diff bushing is MANGLED... Did it get that way from pressing it out/removing it?

CTSV_Rob
03-12-12, 10:15 PM
No, just driving the car, mine looked the same way.

----------


Yea ditto on the fun factor, totally transforms the car, also excelerates in a straight line it seems, rear feels much more planted, and that GOD awful clunk is gone, I used the diff block also and have not noticed any noticabe noise or vibes, should of done it years ago.

Yea some rust but it is all stock and staying that way till they fail.
As long as she runs that's all that matters.

I wish I had gone with the diff block. The next retrofit for the rear may be the creative diff retro if I decide to keep the car.

6 SPEED Z
03-12-12, 10:32 PM
No, just driving the car, mine looked the same way.

----------


As long as she runs that's all that matters.



I wish I had gone with the diff block. The next retrofit for the rear may be the creative diff retro if I decide to keep the car.





Yea thats the way it came out of the car, as I lowered the diff the guts fell out on the ground leaving just the shell/sleeve still in the diff. Not one of GM's finer moments for sure.

CTSV_Rob
03-13-12, 01:01 PM
Agreed.