CWLONGSHOT Posted February 25, 2008 Share Posted February 25, 2008 I have been having problems with the two studs in the exhaust manifold where the header pipe attaches. (4.0L) The studs are old and rusty and just will not stay tight. I would LOVE to just change them... But they are in a tight spot and not easy to get at. Last night one nut fell right off and now will not stay on at all. SO, now I HAVE to do something..... Got allot of clunking and banging going on under there. I am REALLY hoping I can accomplish this without removing the manifold..... here is my question. I am thinking they must be screw in, but I am not sure. Doe's anyone know for sure one way or the other?? Also, are the metric or standard? Thanks, CW Link to comment Share on other sites More sharing options...
Eagle Posted February 25, 2008 Share Posted February 25, 2008 They do screw in, and I'm 90% certain they are an SAE thread. I believe the manifold end is a coarse thread and the "working" end is a fine thread, but I may be recalling the way the old AMC engines were set up. Link to comment Share on other sites More sharing options...
Wildman Posted February 25, 2008 Share Posted February 25, 2008 My thought was the mounting bolts were "pressed" in the manifold :dunno: Every thing is so corroded around here :cry: I've replaced them using a 'hot wrench' and installed 3/8" x 2" Grade 8 bolts. And had no problems, well except from burning from below :roll: Link to comment Share on other sites More sharing options...
beaterjeep Posted February 25, 2008 Share Posted February 25, 2008 well except from burning from below :roll: You do know they make hemorrhoid creams, right? :D OH, wrong burning from below, sorry bout that, returning to your usually scheduled thread now. CW, my 88 2.5 had the same problem, and I honestly don't know what all was done to it, but something about new bolts and nuts somewhere, and a new downpipe. Either way, it's been working for me for about 4 years now. Link to comment Share on other sites More sharing options...
jeepthing07 Posted February 26, 2008 Share Posted February 26, 2008 they are press in like a wheel stud i just hit mine with a hammer and knocked them out. i went to the dealer to get new ones but they were really expensive so i just put regular bolts back in it i havent had any problems out of it. Link to comment Share on other sites More sharing options...
maddzz1 Posted February 26, 2008 Share Posted February 26, 2008 I had the same problrm on the exhaust of an old car before. I put the locking nuts on with the plastic washer in them and it finally stayed on. I think the plastic washer melted and held it from coming loose. Link to comment Share on other sites More sharing options...
maddzz1 Posted February 26, 2008 Share Posted February 26, 2008 I had the same problrm on the exhaust of an old car before. I put the locking nuts on with the plastic washer in them and it finally stayed on. I think the plastic washer melted and held it from coming loose. Link to comment Share on other sites More sharing options...
CWLONGSHOT Posted February 26, 2008 Author Share Posted February 26, 2008 They do screw in, and I'm 90% certain they are an SAE thread. they are press in like a wheel stud i just hit mine with a hammer and knocked them out. And this is the cruxt of my problem... :oops: :cry: :eek: I too have seen BOTH. Just not on a XJ/MJ. I am inclined to go with Eagle. (No offence jeepthing) But again, this is the answer I WANT. Now, I know the 2.5 4CYL is a press in as I did this on one and we now use nuts and bolts. I do not see a way to just "knock it out" as the only access is from below. (With out complete removal) HELP........ CW Link to comment Share on other sites More sharing options...
BLHTAZ Posted February 26, 2008 Share Posted February 26, 2008 I'll get back to you in a little while when I get to work and ask our engine guy how they are in there and what is a good trick to changing them. I would be soaking them with some PB Blaster [or the like] to start with though. Link to comment Share on other sites More sharing options...
BLHTAZ Posted February 26, 2008 Share Posted February 26, 2008 They are a pressed in stud as previously described. They resemble a wheel stud and have to be pressed/knocked out from the bottom. You can knock them out and then replace them with a regular bolt & nut set up as many do in this situation. :cheers: Link to comment Share on other sites More sharing options...
CWLONGSHOT Posted February 26, 2008 Author Share Posted February 26, 2008 They are a pressed in stud as previously described. They resemble a wheel stud and have to be pressed/knocked out from the bottom. You can knock them out and then replace them with a regular bolt & nut set up as many do in this situation. :cheers: THANKS MAN!! OOH, and my apologies to you, Jeep thing, I didn't take your advice and looks like you are correct. (I also called a local exhaust shop and he too confirmed that they drive them out from beneath and replace with nuts and bolts.) :oops: CW Link to comment Share on other sites More sharing options...
CWLONGSHOT Posted March 8, 2008 Author Share Posted March 8, 2008 Guys... they PRESS IN!! As you can see...mine where SHOT!!! I just replaced them with nuts and bolts. Also made a better mid hanger. Its now WAY BETTER and also found a very annoying clunk...that's GONE now as well!! GOOD DAY!! CW Link to comment Share on other sites More sharing options...
BLHTAZ Posted March 9, 2008 Share Posted March 9, 2008 :eek: WOW...those things are very well worn... Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 9, 2008 Share Posted March 9, 2008 they are press in like a wheel stud i just hit mine with a hammer and knocked them out. i went to the dealer to get new ones but they were really expensive so i just put regular bolts back in it i havent had any problems out of it. ?? I just looked these up. The replacement studs part number is J4007109 and they are like $3.85/ea. Link to comment Share on other sites More sharing options...
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