Not the best? More like completely useless against rusted bolts. It's
nowhere near as effective a penetrant as Kroil, Liquid Wrench or PB Blaster.
Nor is it a decent lubricant. It's not even all that great as a water
deterent compared to using stuff like Boeshield.

What helps the most when using actual penetrating oils is time. Put some on
it and let it sit for a couple hours. Then tap it lightly with a hammer
several times and reapply the oil. Repeat. The vibration caused by the
hammer will help loosen the rust bond, thus making room for more oil to
penetrate. Repeating the process often helps get enough of it loosened to
back it out. Like someone else said, with quite a screeching sound.

They're called exhaust studs. Any auto parts place should carry them.

-Bill Kearney

hmmm
Might I add that having a positive attitude along with saying a little
prayer during the operation has usually helped me during these rare
occasions. <g>

Since you have enough meat on the stud then the torch along with the
vise-grip pliers WILL work. Like the others said heat up the area up around
the stud, try to get it to budge even JUST A LITTLE with the vise grips is
good. Then when it cools down some you can spray it with some good rust
penetrant. There will be smoke and noxious gas so please work in a well
ventilated place along with having a fire extinguisher handy.
Work it back and forth taking care not to break it again. Use plenty of the
penetrant while working it back and forth. It it gets stuck again use the
torch to heat it back up and repeat.

Heat is one of my best tools on rusted nuts and bolts! ;-)
--
later,
dave AKA vwdoc1

wb writes:

No. It's a splined press-fit stud like on a wheel hub, not a threaded
fastener. You have to press it out (if the assembly is on a workbench) or
drill it out (if the assembly is on the car). Forget the advice from the
more-macho-than-thou types about rusty bolt extraction.

Richard J Kinch wrote:
Since when?

I have removed more exhaust studs than I care to remember over the years
and have 'never' seen or heard of a pressed fit exhaust stud in any
vehicle I have been exposed to.

I also have removed a couple 80's YJ ones...

The replacements come in kits with the special brass nuts.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Mike Romain writes:

You must be thinking about something else.

We're talking about the manifold to pipe connector.

Here's the version NAPA sells for the TJ, part BK 6003227:

http://partimages2.genpt.com/partimages/235194.jpg

Richard J Kinch wrote:
Good lord, you are now telling me the $tealerships just came up with
another way to screw you out of big bucks by replacing a screw stud with
a press fit that needs a freaking machine shop to fix? It also has what
looks like a steel nut which is pretty much guaranteed to rust weld it
making removal impossible.

When did they start this rip off?

I would guess with the TJ?

The YJ 258 uses screw studs and brass nuts as far as I have seen and I
have taken a couple apart. I sure didn't notice heads in there.

Your NAPA link is for a TJ, not a YJ.

Mike

Richard J Kinch wrote:
now that's a brilliant way to rip folks off.

I'd be taking a press to remove it and replace the
thing with a normal bolt.

--
DougW

Are you sure you're not picturing axle lugs??? I've welded bolts to the
collectors for ease of removable, but we always us coarse threads and brass
nuts.
God Bless America, Bill 0|||||||0
mailto:LWHughes3rd (AT) aol (DOT) com http://www.billhughes.com/

"Richard J Kinch" <kinch (AT) truetex (DOT) com> wrote in message

I looked up the offending part in the parts book.

The OP has an 88YJ which would be the 4.2 l engine, cast iron exhaust
manifilds and the SCREW IN studs. The 4.0 l engine in the 88 Cherokee
uses the fabricated manifolds with the PRESS IN studs. (Pressed in
through the thin manifold plate. )

If the OP has the 4 cyl, they would be the press in variety.

Richard J Kinch wrote:

L.W. (Bill) Hughes III writes:

Yes I'm sure. And you will be too if you just take a moment to look at a
TJ manifold, or look up the NAPA part I quoted, instead of assuming I'm an
idiot that doesn't know the difference.