ANOTHER exhaust question...

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

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.

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:

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.

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 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.

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.

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

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.

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:

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

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

:eek: WOW...those things are very well worn...

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.