Prevent Exhaust Studs From Snapping?

[colourclassic]

Any tips on preventing turbo -> dump pipe studs or any other stud subjected to heat from snapping?

It seems no matter what I try I always have at least one stud either snapping or threading in it's bore.

•I always use genuine Nissan studs (inconel?)

•I always torque them to spec

•I generally chase the threads to make sure they're clean before installing hardware

•Tried using nickel anti-seize but it seems to gum up the threads making installation difficult

Any way to stop this, as I take my turbo off pretty often and it's annoying having to extract studs and helcoil each time.

[Therealsandybang]

Mate had a recurring issue with one of those Chinese manis kept heating up and flexing, snapping the studs. You using stock items?

Edited February 11, 2015 by Therealsandybang

[Humbla]

The amount of heat these bolts have to tolerate is huge,no way will they last forever its impossible, hot and cold,and then they crack and brake had to get mine replaced several times over the last 12 years.Do I still love my 93 skyline ? you bet I do bang for buck and if you look after them they are fantastic nothing better. :-) :-) :-) :-) :-) :-) :-) :-)

[colourclassic]

Stock mani..

Any type of stud which is rated for higher temperatures? Copper washers to displace the load?

[Ben C34]

Are you using the correct washers?

[colourclassic]

On the manifold, yes.

But the ones of main concern are the smaller M8x1.25 studs on the turbo -> dump pipe.

[scotty nm35]

I would say the flange isn't straight, or the exhaust is causing it. Do you have a flex join in the front pipe?

Never heard of the dump studs/bolts snapping. Anti seize should be helping, but perhaps the nuts are crap too? They shouldn't be too tight or they will gall up and bind, especially if warm still.

[iruvyouskyrine]

Is your exhaust stable and doesn't flop around? I can almost guarantee it's the exhaust if it has excess movement/missing a hangar etc.

[colourclassic]

Exhaust is fine and all hangers are in place. No flex joint though as it's a JJR front/dump pipe combo.

I'll try anti-seize again this time.

[Therealsandybang]

Aren't the jjrs missing the mount that stock front pipes have.

[Therealsandybang]

[colourclassic]

Nope, the front pipe uses a bracket which supports the flange near the cat/gearbox.

[Therealsandybang]

Ahh okay cool

Cool

[scotty nm35]

Unfortunately the Skyline hangers are pretty crappy, there is nothing to stop the muffler moving side to side when you corner. This force is transferred down into the turbo/manifold, and the exhaust makes for a very long and heavy breaker bar. I always put a flex into the front pipe for this reason.

[DoseVader]

Had this problem when I took my stock turbo out but I assume mine was just from old age as the bolts where the factory ones from 16 years ago. Do you have a link to where you are buying the nissan ones from as I need a set?

[colourclassic]

Taarks

[Therealsandybang]

I got the kit for r34 from kudos Motorsport.

[DoseVader]

I got the kit for r34 from kudos Motorsport.

Thats convient I need to get a few things off them

[zoomzoom]

Unfortunately the Skyline hangers are pretty crappy, there is nothing to stop the muffler moving side to side when you corner. This force is transferred down into the turbo/manifold, and the exhaust makes for a very long and heavy breaker bar. I always put a flex into the front pipe for this reason.

I was going to make a thread about this a while back. If you look up "landcruiser exhaust mount" you should find these rubber bushes with bolts attached like so:

http://www.ebay.com.au/itm/Landcruiser-HZJ80-HDJ80-Series-Exhaust-Mount-Rubber-Set-3-/201205416170?pt=LH_DefaultDomain_15&hash=item2ed8c700ea

I have replaced my rear exhaust hangers, and the cat converter brace with custom brackets and these rubber mounts. The rubber has flex in order to absorb vibration and allow for expansion of metal, but the exhaust cant sway in any direction very far. I find even hard hangers dont work because even if they dont stretch, the pendulum effect allows the exhaust to swing and touch things.

[Therealsandybang]

Interesting stuff and perhaps a really stupid statement or question but I knew my studs were broken and a couple were but it didn't affect how the vehicle ran. I suppose my question is if I have a permanent street setup will I have to routinely remove these studs every year or two years?

Edited February 13, 2015 by Therealsandybang