5.4L Exhaust Manifold Stud/Nut Opinion
03-22-2017, 04:12 PM
#1
Junior Member
Thread Starter
Join Date: Mar 2017
Posts: 2
Likes: 0
Received 0 Likes
on
0 Posts
5.4L Exhaust Manifold Stud/Nut Opinion
I bought my first truck in December, a 2009 F150 SC FX4. My first post, so I'll disclaim I'm a total noob. 
Shortly after I purchased said truck I discovered an exhaust leak that wasn't disclosed at the time of sale. I took it to a local mechanic who removed the manifold, removed two broken studs and installed a new gasket. The manifold was reinstalled as he said it was in good shape.
But the problem still persists. I lifted the hood today, and I see the pictured stud/nut, which to me looks cross threaded. In your opinions, would the pictured cause an exhaust leak? Or should I look at replacing the manifold?
Shortly after I purchased said truck I discovered an exhaust leak that wasn't disclosed at the time of sale. I took it to a local mechanic who removed the manifold, removed two broken studs and installed a new gasket. The manifold was reinstalled as he said it was in good shape.
But the problem still persists. I lifted the hood today, and I see the pictured stud/nut, which to me looks cross threaded. In your opinions, would the pictured cause an exhaust leak? Or should I look at replacing the manifold?
03-22-2017, 07:01 PM
#2
Senior Member
Looks to me like bolt with lock washer. Not tight against manifold. I bet bolt is either lose or bottomed out in hole. I would take out bolt and use stud with nut. Same size as bolt.
There's no telling what this guy did, may have drilled out stud and put oversized bolt in.
I would go with oem manifold with stainless studs and nuts. And I did twice. Dorman manifold cracked first time...
After looking at the original nut and stud to right it doesn't look like it was removed, no marks on nut. Maybe never removed.
He could have welded nut on end of broken stud and removed without removing manifold but gasket would still be bad.
There's no telling what this guy did, may have drilled out stud and put oversized bolt in.
I would go with oem manifold with stainless studs and nuts. And I did twice. Dorman manifold cracked first time...
After looking at the original nut and stud to right it doesn't look like it was removed, no marks on nut. Maybe never removed.
He could have welded nut on end of broken stud and removed without removing manifold but gasket would still be bad.
Last edited by raisin; 03-22-2017 at 07:09 PM.
