Re: Snapped off an exhaust bolt
 

> Yeah, I realized the WD40 is not the best for rust.

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.

> Do I replace it with a headless bolt (do they have a proper term for
these),
> screwed in from underneath?

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

-Bill Kearney

Re: Snapped off an exhaust bolt
 

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

Re: Snapped off an exhaust bolt
 

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

Re: Snapped off an exhaust bolt
 

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

Re: Snapped off an exhaust bolt
 

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

Re: Snapped off an exhaust bolt
 

wb writes:

> Should I
> be able to unscrew it from the manifold fitting, assuming I get it hot
> enough and soak it enough with the right kind of lubricant?

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.

Re: Snapped off an exhaust bolt
 

wb writes:

> Should I
> be able to unscrew it from the manifold fitting, assuming I get it hot
> enough and soak it enough with the right kind of lubricant?

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.

Re: Snapped off an exhaust bolt
 

wb writes:

> Should I
> be able to unscrew it from the manifold fitting, assuming I get it hot
> enough and soak it enough with the right kind of lubricant?

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.

Re: Snapped off an exhaust bolt
 

wb writes:

> Should I
> be able to unscrew it from the manifold fitting, assuming I get it hot
> enough and soak it enough with the right kind of lubricant?

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.

Re: Snapped off an exhaust bolt
 

Richard J Kinch wrote:
> wb writes:
>
>> Should I
>> be able to unscrew it from the manifold fitting, assuming I get it hot
>> enough and soak it enough with the right kind of lubricant?
>
> 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.

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
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