Broken subframe stud. HALP. - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Unfairz33 · 11-28-2015, 10:41 AM

Hey zilvia. To make short of a long story I live in the rust belt and when removing my rear subframe I went full retard and broke one of the four big rear subframe mount studs. I've done some searching on it and came up with a lot of questionable information. Just an FYI, this is on a 350z rather than an schassis but it's the same stud. From what I've gathered so far.....

Studs are pressed in like those in the hub, so some are saying holesaw the floor, grind off the weld if there is any (I've read about some cars that have it welded on top and some that dont), get a BFH wallop that bish back out the top and replace it. Which is simple enough in theory, but you can't buy just the stud so I'd have to either have on machined or find one from a salvage yard and hope I can get it out without it snapping.

Other option I read about... holesaw floor, measure top of stud and center punch. Cut the old threaded part off the body of the stud, drill out the center, tap it, and run a bolt through the whole bit to achieve the original length, and then put a nut back on the bottom. I like this option because I don't run such a huge risk of muffing up the subframe mount locations and making the ass of the car permantly crooked. It's a bit complicated tho.

This leads to my question, has anyone ever removed the stud and just run a big ass, shouldered, high grade bolt in there? I realize that it's not necessarily the perfect solution, but it would be noticeably simplier. Any ideas, input, help, or experiences would be appreciated. Either way I'll do my best to document the process as I go so there can finally be a thread with a way to solve this.

One last thing, to anyone who is thinking of suggesting cutting out a piece of my frame, and replacing it with a piece of frame that has an unbroken stud in it... no. Not doing it.

11-28-2015, 10:41 AM	#1
Unfairz33 Join Date: Aug 2013 Location: Wilkes barre pa Age: 34 Posts: 5 Trader Rating: (0) Feedback Score: 0 reviews	Broken subframe stud. HALP. Hey zilvia. To make short of a long story I live in the rust belt and when removing my rear subframe I went full retard and broke one of the four big rear subframe mount studs. I've done some searching on it and came up with a lot of questionable information. Just an FYI, this is on a 350z rather than an schassis but it's the same stud. From what I've gathered so far..... Studs are pressed in like those in the hub, so some are saying holesaw the floor, grind off the weld if there is any (I've read about some cars that have it welded on top and some that dont), get a BFH wallop that bish back out the top and replace it. Which is simple enough in theory, but you can't buy just the stud so I'd have to either have on machined or find one from a salvage yard and hope I can get it out without it snapping. Other option I read about... holesaw floor, measure top of stud and center punch. Cut the old threaded part off the body of the stud, drill out the center, tap it, and run a bolt through the whole bit to achieve the original length, and then put a nut back on the bottom. I like this option because I don't run such a huge risk of muffing up the subframe mount locations and making the ass of the car permantly crooked. It's a bit complicated tho. This leads to my question, has anyone ever removed the stud and just run a big ass, shouldered, high grade bolt in there? I realize that it's not necessarily the perfect solution, but it would be noticeably simplier. Any ideas, input, help, or experiences would be appreciated. Either way I'll do my best to document the process as I go so there can finally be a thread with a way to solve this. One last thing, to anyone who is thinking of suggesting cutting out a piece of my frame, and replacing it with a piece of frame that has an unbroken stud in it... no. Not doing it.