HELP! Broke body bolt

[Hootbro]

Just a PSA, if you have a medical implanted electronic device like a pacemaker or a combo pacemaker/ICD, you want to avoid the induction coil heating tools due to the electromagnetic interference they generate.

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[Minty JL]

Just a PSA, if you have a medical implanted electronic device like a pacemaker or a combo pacemaker/ICD, you want to avoid the induction coil heating tools due to the electromagnetic interference they generate.

I didn't or would have never thought about this

 

[Hootbro]

I didn't or would have never thought about this

I think @ShadowsPapa brought it up in another thread as I was looking to get one and have a device implant so that nixed that idea. Supposedly they put out some serious EMI waves.

 

[ShadowsPapa]

I think @ShadowsPapa brought it up in another thread as I was looking to get one and have a device implant so that nixed that idea. Supposedly they put out some serious EMI waves.

A friend, who has since passed due to his heart issues, had a pacemaker in his final years.
He owned and operated Moose Magneto.
Guess what he had to stop doing........... no leaning over a fender working on ignition, alternators (magnetic fields) and absolutely stay away from turning on his magnet charger. He had to close down his ignition shop.
Induction heaters do indeed heat by induction.
They remind me of a school science class where the teacher gave a demo to the class - a coil of heavy wire around a wood post. The coil was connected to a power supply. He put a ring of aluminum on top of the coil of wire and triggered a quick momentary switch powering the coil of wire for a brief moment. The aluminum ring shot to the ceiling (his classroom ceiling was full of holes and marks). He warned us to not touch that aluminum ring (it was HOT, instant bad burns).
The idea was - sit and discuss what happened and why....
two things - the flow, and dropping, of the current in the coil induced a strong current in the aluminum ring, and a magnetic field so strong it shot the ring hard up to the ceiling.
Imagine that EMI impacting a pacemaker or similar.
I even remove my hearing aids and move them away because they contain teeny coils and wire leads.
It's pretty strong stuff if you can use one to heat an iron bar to the point of orange in seconds.

I have installed Rock Hard sliders on two Gladiators. I used a breaker bar, no heat, no back and forth. Both went OK. Looking at the video referenced above, there are a lot of threads above the factory nut. I would weld a nut on the end of the broken bolt and while hot, use a ratchet with socket to turn it upwards and remove the stub. Then you have a fairly small hole to cover with a rubber round plug, etc. Buy grade 12.9 allen bolts as replacements, as I did, and install with grease on the threads.

Grease on the threads? Isn't that asking for bolts to loosen?
Allen? Why allen? Curious. Why not go back with the proper body bolt?

- how will you access the thread end of the bolt to gain access? Cut a hole in the body? Maybe I missed where you told how to get to the bolt if it's the front of the three on either side.

on JTs and JLUs, it's usually the left side, front bolt just behind the wheel that is the worst.
The rear of the three typically come loose a lot easier.

I've done two Jeeps - a JLU and my JT, and it's exactly like other Wrangler owners said - always that left front (not the far front in the engine bay, but the front of the 3 you need to loosen).

Some were easy, some were really stubborn. The left front I had loose enough to get the bracket in place between bolt head and big washer, and as I started to tighten, it snapped.
I then did what I should have done before even putting a wrench to it - bought the induction heater.
Even FCA's own documentation shows and says - use an induction heater on the body bolts. It's in black and white in their own "how to remove the body" documents.
But no - we don't read the instructions LOL

 

[MSFTMatt]

Just a PSA, if you have a medical implanted electronic device like a pacemaker or a combo pacemaker/ICD, you want to avoid the induction coil heating tools due to the electromagnetic interference they generate.

That’s crazy! I’ve had a paramedic license for 20 years and never knew that. Learn something new everyday!

 

[Rusty PW]

They remind me of a school science class where the teacher gave a demo to the class - a coil of heavy wire around a wood post. The coil was connected to a power supply. He put a ring of aluminum on top of the coil of wire and triggered a quick momentary switch powering the coil of wire for a brief moment. The aluminum ring shot to the ceiling (his classroom ceiling was full of holes and marks). He warned us to not touch that aluminum ring (it was HOT, instant bad burns).
The idea was - sit and discuss what happened and why....
two things - the flow, and dropping, of the current in the coil induced a strong current in the aluminum ring, and a magnetic field so strong it shot the ring hard up to the ceiling.

What you are saying. The teacher used a non magnetic piece of metal, and magnetized it. I'm calling BS on the aluminum.

 

[fourfa]

Aluminum is paramagnetic - with enough field flux, you can induce magnetism in it. There are a lot of famous physics demos showing this. The one I saw in physics class, you stick an aluminum can in the center of a giant magnet, energize, and the can gets ripped in half and the ends shoot outward like bullets

 

[Minty JL]

Aluminum is paramagnetic - with enough field flux, you can induce magnetism in it. There are a lot of famous physics demos showing this. The one I saw in physics class, you stick an aluminum can in the center of a giant magnet, energize, and the can gets ripped in half and the ends shoot outward like bullets

I'd like to see a video of that

 

[ShadowsPapa]

What you are saying. The teacher used a non magnetic piece of metal, and magnetized it. I'm calling BS on the aluminum.

It conducts electricity, thus, it can generate a magnetic field around itself.
Even aluminum wiring going to your home carries a magnetic field around it.

From WIS.EDU physics department -

The video below is a much smaller version of what our teacher used. The coil he used was as big around as the magnetic coil on a 1980 car AC compressor clutch. And the aluminum ring was larger and shot up hard to the ceiling.






More fun stuff - (paramagnet aluminum, etc.)

 

[ShadowsPapa]

Aluminum is paramagnetic - with enough field flux, you can induce magnetism in it. There are a lot of famous physics demos showing this. The one I saw in physics class, you stick an aluminum can in the center of a giant magnet, energize, and the can gets ripped in half and the ends shoot outward like bullets

Above is proof there's a lot of smart people here.

I always loved the demonstrations of Bill Fox, our science guy. He taught by example and wasn't afraid to annoy the maintenance people. Exploding flower cans, marks in the ceiling, it got your attention. Demo then discussion - what happened and why.

I found what you are likely referring to and posted a couple of amazing videos on the properties of aluminum.

 

[Lunentucker]

That’s crazy! I’ve had a paramedic license for 20 years and never knew that. Learn something new everyday!

I'd say the chances are minimal, but not zero.
When they disabled my dad's pacemaker the night before he died, they had to place a very powerful donut magnet on his chest in a very specific way to toggle the device off.
You've probably seen them in your training. You should have one at hand on your crash cart.

 

[ShadowsPapa]

I'd like to see a video of that

OK

 

[ShadowsPapa]

I'd say the chances are minimal, but not zero.
When they disabled my dad's pacemaker the night before he died, they had to place a very powerful donut magnet on his chest in a very specific way to toggle the device off.
You've probably seen them in your training. You should have one at hand on your crash cart.

The power in the better induction heaters is amazing. And you don't want to wear metal stuff when using the magnet charger Art had in his shop.
I'm tempted to buy that thing as it can charge the magnets in my antique engines.
You are correct in "minimal". You know that people are exposed to things they aren't aware of on a regular basis - it just takes that "just right" thing to cause troubles.
Art was told - no more, you are done. Likely some differences between alternating current magnetic fields (alternator stator windings) and a simple strong magnet, too.
I'm not trained on pacemakers, and only have basic Red Cross training - I only can go by what Art said years ago and the fact he had to shut down the best performance ignition shop in the country.
I still need to go pick up a distributor machine and other stuff I told his widow, Donna, that I'd buy.

 

[whiteglad]

I chose Allen head bolts because they are commonly available in the very high strength (170.000 psi) 12.9 grade. Once torqued as specified, they do not tend to loosen--mine never did. If you are a worrier, check them once in a while. I have done so and they were still tight. The stock bolts are grade 10.9 (150,000 psi).

 

[Hootbro]

I'd say the chances are minimal, but not zero.

Correct and that is pretty much with any modern medical electronic implant device. They are shielded pretty well but there is still a emitter and receiver function of the devices that are susceptible to EMI interference in the right conditions.

When I got my device some years ago, I had to go through a audit questionnaire of my working history and daily access to RF type energy. Working in Avionics Engineering design and manufacturing, I have to watch what environments I am in. People in trades that use either direct energy devices and unshielded EMI environments like plasma cutting, arc welding and use of tools like the already mentioned induction coil heaters have to take even more precautions or in some cases, find another trade.

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