kiwininja Posted January 12, 2008 Share Posted January 12, 2008 So over the last few months I have tore down the engine in my wife's Pathfinder to fix the broken exhaust manifold studs. While I was taking everything apart I had a small problem with the studs that connect the flange of the passenger side exhaust manifold to the exhaust pipe. The nuts were rusted on so bad that the whole stud came out when I tried to loosen them. Now that I've got the engine back together I can't get the stupid exhaust pipe connected to the manifold. The old studs are really rusty and I thought it might be a good idea to replace them with some new bolts. The problem is, no matter how hard I try I can't get the flange on the exhaust pipe to line up properly with the manifold to get all the bolts in. I've managed to get one in, and I've been wrestling with the other two for hours with no luck what so ever. Is there something I'm missing here? Please don't tell me I need to remove the manifold again and put new studs in. I just got the stupid thing back together. Link to comment Share on other sites More sharing options...
GrimGreg Posted January 13, 2008 Share Posted January 13, 2008 Don't remove it, but loosen the nuts on the manifold a little so you have a little wiggle room, should help. Link to comment Share on other sites More sharing options...
88pathoffroad Posted January 13, 2008 Share Posted January 13, 2008 You could try undoing one of the exhaust hangers or something too. Link to comment Share on other sites More sharing options...
unccpathfinder Posted January 13, 2008 Share Posted January 13, 2008 I hope you are replacing all of the studs and not just the ones that broke...do you have the manifold loose down at the bottom (Y pipe) if not I would try that... Link to comment Share on other sites More sharing options...
Joey Posted January 22, 2008 Share Posted January 22, 2008 i am taking my exhaust off from the manifold in order to remove my tranny, were all your nuts on the studs different sizes? or what size sockets did you use to take the nuts off? Link to comment Share on other sites More sharing options...
GrimGreg Posted January 23, 2008 Share Posted January 23, 2008 Most everything is 10, 12 or 14 mm on a Nissan. Link to comment Share on other sites More sharing options...
Joey Posted January 23, 2008 Share Posted January 23, 2008 Do you guys have any tricks to get rusted bolts out from the exhaust? I do not want to strip them but i need them out.. Link to comment Share on other sites More sharing options...
GrimGreg Posted January 23, 2008 Share Posted January 23, 2008 A torch and some wax. Heat the bolt up to red hot, then rub a candle on it to let the wax melt into the threads, better than PB Blaster! Link to comment Share on other sites More sharing options...
Slick Posted January 23, 2008 Share Posted January 23, 2008 Do you guys have any tricks to get rusted bolts out from the exhaust? I do not want to strip them but i need them out.. PB blaster is your FRIEND.......... really Link to comment Share on other sites More sharing options...
unccpathfinder Posted January 24, 2008 Share Posted January 24, 2008 PB blaster is your FRIEND patience is too...let it soak in...you can also use the torch method just watch out for the fuel lines... if you dont break any your lucky as hell...but y pull them off at the manifold and not the collector its only 3 bolts on either side and if you break one it wouldnt be as bad to fix... just use lots of extensions and get it from the bottom side with an impact (yes impact gun is better on exhaust bolts you have less of a chance to break them and keeping the amount of heat down in them...I didn't believe it until my mechanic buddy proved it to me...I broke 2 of 3 he broke none) Link to comment Share on other sites More sharing options...
boothill2008 Posted February 23, 2008 Share Posted February 23, 2008 Do you guys have any tricks to get rusted bolts out from the exhaust? I do not want to strip them but i need them out.. I had the same problem below the driver's floor pan right my the oxygen sensor, after using Liquid Wrench and tapping it a few times, it came out using a 6 sided socket on a universal. The bolts were trashed, and I ended up replacing them with new ones. Inspect the area of the exhaust gasket, if it is slightly warped you may end up replacing that gasket again. The space was cramped, and it seemed like it took an hour to get the bolt on the engine side in as I could only get about a quarter turn each time.... Hope that helps, Boot Link to comment Share on other sites More sharing options...
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