TimZ Posted June 8, 2001 Share Posted June 8, 2001 As far as I know, they are threaded. At least mine are (I'm using an N42 head). You should be able to get the studs from a Nissan Dealer - I got mine from Courtesy Nissan. I used a prevailing torque-style nut on mine ("ovaled"), in an attempt to keep them from backing out - seems to be working so far. You can get these at a decent fastener supplier. Quote Link to comment Share on other sites More sharing options...
Nigel Posted June 8, 2001 Author Share Posted June 8, 2001 I'm trying to freshen up the gasket surface on the exhaust manifold where the turbo bolts up, and the studs are getting in the way. I've tried removing the studs, but they won't budge, even after torching the manifold. I just want to confirm that they are threaded into the manifold and not pressed in. Anyone know? Also, does anyone know where to get replacement studs, should one break? They're stainless, and it's next to impossible to find an M10 stainless fastener with a 1.25 thread pitch. Thanks! Nigel Quote Link to comment Share on other sites More sharing options...
Nigel Posted June 8, 2001 Author Share Posted June 8, 2001 Well, I chickend out. The studs just weren't budging, and I had visions of broken studs, machining costs, and lost time. I'll just have to work around the studs in order to clean up the gasket surface. Thanks Tim Nigel Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted June 8, 2001 Share Posted June 8, 2001 Have you tried the time honored Vice Grip approach to removal? Just a thought, I'm pretty sure they're threaded too, It seems like you can see the treaded part on the top half of the flange. I could be mistaken though. Haven't looked at it recently. Quote Link to comment Share on other sites More sharing options...
Nigel Posted June 8, 2001 Author Share Posted June 8, 2001 I double-bolted the studs, and torched the manifold real good, but the studs just start to twist. I guess 20 years threaded into a cast iron manifold with countless heat cycles and exposure to the elements have entombed the studs. If one breaks, it's a lot of time and money for a questionable return. I think I can tidy the gasket surface up well enough that it will seal ok. Thanks for the ideas though! Nigel Quote Link to comment Share on other sites More sharing options...
240Z Turbo Posted June 10, 2001 Share Posted June 10, 2001 I have done it before and they are threaded. I had to remove mine to put on longer ones when I used to run the t3/T04E and I had to make a spacer between the manifold and turbo. This required that I used longer studs. Anyway, I soaked them with penetrating oil and use some Massive Vice grips and worked them free. Try tightening them 1st to break them loose and then back them out. Don't give up, this is man vs Bolt....Who will win! Quote Link to comment Share on other sites More sharing options...
clint78z Posted June 14, 2001 Share Posted June 14, 2001 Agreed the vise grips are the best method for this. Heat them right up, then tighten the visegrip as much as you can. Start rocking back and forth in small motions, and keep going in these small motions until it is all the way out. Quote Link to comment Share on other sites More sharing options...
Nigel Posted June 18, 2001 Author Share Posted June 18, 2001 Heat the vice-grips? Ouch! Well, to up-date you all, I striped the threads on one of the studs. I think I'm just going to hand the manifold over to a machine shop and let them pull the studs and machine the gasket surfaces. I don't want to waste any more of my time on this! Nigel Quote Link to comment Share on other sites More sharing options...
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