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mr. cob

Kinda off topic, need tips on how to remove bolt that spins

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Howdy All,

As I have ordered the new seats I thought I would start working on getting old seats ready to remove.  Started on the passenger seat, it is held in place by 4 bolts, all were snug but they broke free, 3 came out the 4th one loosened about three maybe four threads the started to spin with out coming out.

Of course its in a spot where you can get anything under the head to lever it up while turning it with the socket.  As the other 3 bolts are out I tried placing a small piece of pipe under the seat mount and putting pressure on the seat using it as a lever to put upward pressure on the bolt while turning it with the socket, this was not successful.

So if anyone has any suggestions on how to get this darn bolt out I sure would appreciate hearing about them, THANKS.

Dave

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Sounds like the nut on the other end busted loose?  Can you get to it from underneath?  I use an angle grinder with cutting wheel to remove these but they do throw a lot of sparks.  Might be a pain to get too, but your probably going to have to access the nut from under the floor to put a new bolt in anywayz.  If you can get to it, a pair of good channel locks to hold the nut would work.

 

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Can you get a sawsall between the floor and the seat? You could drill it out by holding the head with vice grips. As was said you will probably have to access the nut for replacement any way so can you cut the nut off? Or put vice grips on it.

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Howdy All,

Thanks for your suggestions.  I should have done a better job of explaining what it is I am up against.  The cab of the Perterbilt is made from aluminum, there are threaded steel inserts secured to the aluminum cab, the threaded insert is NOT turning, it is still secure, the bolt is spinning in the insert.

So I am "assuming" that the bolt started to back out and then stripped either the treads in the insert or the bolt thread themselves.  No room to even put a hack saw blade inside the seat bracket where the head of the bolt is located, it is inside of a box structure.  Again because of the box structure no way to get under the head of the bolt with a tool like a crow bar, I have tried as long of screw driver as I can get under the head of the bolt, pulling up with a vise grip is impossible again because it is inside of a box structure.

I could use just a hacksaw blade to cut the bolt off if it were placed under the seat mount and on top of the floor, however doing so would leave no way to get a hold of the bolt as it would cut off flush with the floor.  This is a conundrum unlike any I have had to deal with in the past.

Dave

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Cut it off with a whiz-wheel and deal with the (now flush) bolt afterwards. Worst case scenario- leave it in there & drill a new hole nearby in the seat base & new seat.. 

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3 hours ago, rockylarson said:

This will grip it and perhaps give the lifting leverage you need"

 

BROKEN BOLT EXTRACTOR

Looks like a tool to have, but I don't think it will work for you with that problem.  I'm thinking like Mr. Pope with a slight plan of Argo's, grind off the top of it, once you get the seat removed you can drill down into the bolt (you'll have plenty of room) and then replace it with a nut and bolt of your own (assuming you can get under the bed to place another one.

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Another trick (if you have a buzz box & are "adventurous") is to clamp the ground near the floor part, and stick the rod right smack on the bolt, hold it there for a few minutes. Will warm that bolt up right fine. Or "creative engineering 101", weld a nut on top of the stub by reaching inside the nut  and arc'ing it to the top of the stub

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Can you get any kind of grinder or a dremel to the bolt and cut it off? I would worry about a new bolt after the seat was out and you have more room to work. Don't stress that knee.

Brad

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Get a pry bar that is used to pull nails. Use it to pull the screw out as if it was a nail. Deal with the hole after. 

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Howdy All,

Again THANKS for all of your suggestions.  Its colder then heck out this morning its supposed to get up to 36 degrees this afternoon, I'll go out to the truck when it warms up a bit and try to get a decent photo of where this bolt is located, all of the tools that have been suggested won't work as there is no room to use them.  If all else fails I may try to jam something under the mount to where I can use just a hack saw blade to try and cut the bolt off.  Cutting the bolt off will allow the seat to be removed, at that point it might be possible to weld a nut onto the top of the cut off bolt and then somehow pry up on it whilst turning it with a socket in an attempt to remove it.  The only I could get under the truck to gain access to even looking at the floor under the seat is if I put the truck up onto a lift, I don't have any ramps that would begin to support the truck.  There are air tanks under the doors which look to be almost under the area that the seat mount it located possibly blocking access to the floor under the seat.

Dave

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You are ultimately going to have to deal with the problem.      This is a cage nut or rivnut that is broken free, I have had good success using vise-grips on several, a few I had to blast out.      The back right bolt?      The exhaust and air tank are below the bolt, you may not have room to access the nut without removing the tank or exhaust elbow?     

  

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40 minutes ago, GlennWest said:

Turn welder wide open and a 6010 or 6011 if AC welder. Burn that bolt out. I have done and even still use the threads. 

Howdy Glenn,

I sold my Arc Welder many years ago now I use a Mig, I too in the past have done as you suggested.

Dave

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Howdy All,

Sorry for the poor photo, it's hard to even get in a position to see this bolt let alone work on it.  It doesn't show up very well but there is a lip in front of the bolt that is about an inch high, there is no way to get any sort of tool into where this bolt is to cut it off or grind it off.  Even hammering a crow bar underneath the mount I can't get it high enough to cut it off even just using a hack saw blade.

IMG_4083-XL.jpg

Dave

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You said it backed out a bit then just spun right?  It wasn’t enough to allow a crowbar underneath but it’s loose. Only one bolt holding it down?  If so grab the top of the seat or base farthest away, for leverage, bend the whole assembly until you can get a saw or cutting wheel on the bolt. 

Or cut and bend that flange flat for access. Looks like you might be painting it anyway so a few repairs should not matter.  Just my 2cents. 
 

maybe cut a slot down the flange (lip) and across the base right through the head of the bolt. Then when you pry as above the base metal will split open. 

Edited by Sculptor

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12 minutes ago, Sculptor said:

You said it backed out a bit then just spun right?  It wasn’t enough to allow a crowbar underneath but it’s loose. Only one bolt holding it down?  If so grab the top of the seat or base farthest away, for leverage, bend the whole assembly until you can get a saw or cutting wheel on the bolt. 

Or cut and bend that flange flat for access. Looks like you might be painting it anyway so a few repairs should not matter.  Just my 2cents. 
 

maybe cut a slot down the flange (lip) and across the base right through the head of the bolt. Then when you pry as above the base metal will split open. 

Howdy Sculptor,

I understand what your saying, doing it is another matter.  I have fought this for over two hours today, if its not raining I'll work on it some more tomorrow.

Dave

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8 minutes ago, Mntom said:

Dave, can you get the other three bolts out? If so, pull them then you can rock the seat and base in order to put something under the base to lift it and cut the bolt or possibly get enough pressure on the bolt to screw it out.

Howdy Tom,

Take my word on this, I have tried everything I can to include what your talking about, I can't get into the mount to use any type of saw, I can't get under the mount to saw the bolt off, if its not raining tomorrow I am going to try using a carbide  bit to grind off the head of the bolt.  I can get to the head of the bolt with the die grinder but its going to be an extremely slow and messy process.

Dave

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