So I hear that the exhaust mani studs are a bitch. Mine look rusted as hell too. What is the problem usually? Do they break inside? I was thinking to remove them after driving the car hard, to make sure they are nice and hot. Using an oxyacetylene is a bad ideea considering it is so close to he head, no?
Exhaust studs
- Thread starter daught
- Start date
daught said:
From what i understand your saying you haven't tried removing them yet? get a nice long breaker bar and it wont really matter how rusted they are, either you loosen the nut or you will take it out like a screw nut and stud fused together by the rust. They get pretty hot so i would advise against doing it when its hot, I have a few scars from being impatient....
usually on the 7Ms the exhaust studs get stripped; if that happens you'll have to do the helicoil thing so you can properly re-connect the exhaust mani
here's the link to driftmotions kit, i just got it but haven't really learned how to use it yet
http://store.driftmotion.com/productdetails.php?sid=147196ca631976&product_id_int=356
here's the link to driftmotions kit, i just got it but haven't really learned how to use it yet
http://store.driftmotion.com/productdetails.php?sid=147196ca631976&product_id_int=356
PB Blaster on all the nuts and let them soak for a good 15 min. Come back, put a socket and short extension on the nut, and give it a good whack with a hammer. Take the nut off/ stud out. Move on to the next one.
Ah I know what yo uare saying. The stud comes out with the thread. That is not that bad. At leat you dont have to drill the bolt out. Still I think having the car hot will get things loose, but it can be painfull. Can anyone say for sure if oxyacetylene is a good/bad ideea?
A little off topic, but has anyone had bad experinces removing the nut on Helicoil'd studs? I'm about to take my exhaust off, and I did strip the head originally. I've since helicoiled them, but now I am going to take the nuts off and yup, they are rusted. I will definately use a liquid wrench product on them first.
Any experince or feedback?
Any experince or feedback?
You would think that they wouldn't strip loosening, but its pretty common. Cadillac Northstar's with the aluminum blocks have the same problem with the head bolts(I'll never do one again, ugh...). Something about the different metals corroding to each other. I'm not sure how to explain it correctly, so maybe someone who can will chime in...
they are already on so what can you lose? heh.
i gotta helicoil my head too i 2-3 of my studs are stripped out.
its causing my exhaust manifold leak.
its causing my exhaust manifold leak.
You're supposed to locktite the helicoils when you put them in so that they won't come back out when/if you have to take it apart again.
Damn there has to be a way to get the nuts off without exerting force on the studs.
BTW just another ideea. Dunno how good that JB Weld(cold weld glue) stuff is but if you strip the studs could you just put a new set in with JB Weld and then just tighten the nuts?
BTW just another ideea. Dunno how good that JB Weld(cold weld glue) stuff is but if you strip the studs could you just put a new set in with JB Weld and then just tighten the nuts?
no, cause then if the stud snaps you'll make it tough to remove it from the head (if not impossible)
helicoils when properly installed with loctite and using antiseize with the studs and nuts will be problem free...
On the GTE's they tend to blow HG's worse and overheat worse to the point that they anneal the head. Stock sized helicoils will strip back out (ask me how I know this). Aaron's upgrade kit will solve that issue...
helicoils when properly installed with loctite and using antiseize with the studs and nuts will be problem free...
On the GTE's they tend to blow HG's worse and overheat worse to the point that they anneal the head. Stock sized helicoils will strip back out (ask me how I know this). Aaron's upgrade kit will solve that issue...
OK, I took off my manifold and only one helicoil stud screwed out, all the others, the nuts came off no problem. I sprayed some Liquid Wrench on all the nuts/exposed studs and waited about 15 minutes, then took a power bar and gave the nuts a quick turn for them to "pop"... The engine was cold and I had no problems... I'll "red lock" the one stud that came out to see if that will prevent it from coming out. I had done that on the other studs, so I was surprised when one came out. Maybe I missed one in the process.
I believe the trick is not to overtighten the nuts as the heat will expand the manifold and "tighten" things even more. Use a lock tight (blue) on them when you put them on. Also, it might be a good idea to swap in new nuts and not use the old ones.
I believe the trick is not to overtighten the nuts as the heat will expand the manifold and "tighten" things even more. Use a lock tight (blue) on them when you put them on. Also, it might be a good idea to swap in new nuts and not use the old ones.
Stripped head threads are usually indicative that the head is annealed on the exhaust side from being overheated.