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Old 06-21-2008, 02:34 PM   #1
RFP
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Default How to remove seat mounting bolts ?

The title pretty much says it all...

Can someone please tell me how to remove the bolts that come up through the floor pan to which the seats are fastened?

Thanks !
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Old 06-21-2008, 03:20 PM   #2
VET4LES
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15mm socket, a short extension and a ratchet will do it. The front bolt covers are removed by prying them up with a flat screw driver or putty knife. Move the seat forward for the rear bolts and back for the front. Good luck.
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Old 06-21-2008, 03:33 PM   #3
BEZ06
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Quote:
Originally Posted by RFP View Post
The title pretty much says it all...

Can someone please tell me how to remove the bolts that come up through the floor pan to which the seats are fastened?

Thanks !
Well.....I'm not sure why you'd want to do it, but I just had to do that on my Z06!

I didn't want to do it, but I was swapping seats to get full power in the Z06. The bolts stick up through the floor, the seat rails fit down over them, and a nut holds the seat to the floor.

When I tried to take out the passenger seat, one of the front nuts wouldn't come off - the bolt was just spinning around. I jacked up the car and could see the heads of the bolts - on the Z06 they are about the size of a quarter. They are flat, round bolt heads with no way to grab ahold of the thing to hold it while I unscrewed the nut. I ended up needing to drill a hole in that flat bolt head until I could break it off to remove the bolt. I replaced it with a regular hex head bolt and big flat washer.

I just went out an looked under my 2005 coupe without jacking it up. I looks pretty much the same. I could see the round heads of the rear bolts (they are round, but a little thicker and not as wide in diameter as the ones on the Z06), but the front bolts seem to be up a little bit in a frame member - there is an area of goop covering a couple of holes where I think the bolts are. I think you could peel that stuff off and see the round bolt heads up in there.

In the case of the Z06, after I drilled the bolt out, I could see that under the head of the bolt was a sort of star-pattern. It looks something like this elevator bolt, but it had a lobe/star pattern under the head:

Click the image to open in full size.


It seemed to just be held in with some automotive goop or RTV to kind of seal it up to the elements and hold it in place.

So.....I think you could just take the nut off inside the cockpit and whack the tip of the bolt with a hammer - I think that would just knock it right out, but YMMV!!!

Good luck!!!

Bob
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Old 06-21-2008, 04:33 PM   #4
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Quote:
Originally Posted by BEZ06 View Post

So.....I think you could just take the nut off inside the cockpit and whack the tip of the bolt with a hammer - I think that would just knock it right out, but YMMV!!!

Good luck!!!

Bob
Thanks, Bob... that's abut what I expected. Apparently, the bolts are swedged into the metal reinforcement piece under the car... an obvious assembly aid. I could probably get them out by removing the seat, then by slipping a foot or so length of 'close fitting' plumbing pipe over the bolt shank (where it protrudes from the floor, inside the car) and 'wiggle' it from side to side enough to 'break' the friction-fit of the star-pattern grabber thinggie! Then even a modest tap with a hammer should make it drop right out.

I am only going to remove the rear bolts from the driver's side anyway, so - based on your experience - it should be pretty easy!

Thanks again!

Rob
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Old 07-09-2008, 06:52 PM   #5
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Default Well, that was a pain in the neck!

Being basically a chronic Obsessive-compulsive disorder sufferer, I wanted larger seat bolts and full thread engagement when installing my HARDBAR lap belt mounting bracket. That necessitated removing the OEM seat bolts (at the back of the seat) and replacing them with M12-1.75 class 10.9 flange-head bolts with a 1/8" X 2" cold-rolled steel bar reinforcement.

Removing the OEM bolts was a nuisance. After removing the seat hold-down nuts front and back, I simply slipped a foot-long piece of small-diameter plumbing pipe over the bolt and moved it (hard!) from side-to-side and front-to-rear. That broke loose the bolt from the cross piece under the car. The resulting hole wasn't pretty!

OK... here's what it looked like before I started dorking around with it!

Click the image to open in full size.

Here's the bolt... you can see the "bosses" where it was swedged (or welded?) to the cross piece.

Click the image to open in full size.

The hole after wrestling the bolt out (it sure isn't pretty. Even so, I had to run a drill bit through the hole to make it large enough where the M12 bolt would go through)...

Click the image to open in full size.

Here's my reinforcement piece (1/8" cold rolled steel, well painted)...

Click the image to open in full size.

M12-1.785 class 10.9 flange head bolt...

Click the image to open in full size.

Reinforcement and new bolts installed...

Click the image to open in full size.

The HARDBAR mounting bracket installed... This thing is super-strong!!! Please forgive the 'crud' on the carpet... I took the photo before I cleaned up everything!

Click the image to open in full size.

Now, wasn't that boring?

Cheers to all

Rob

Last edited by RFP; 07-21-2008 at 09:55 PM.
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Old 07-09-2008, 07:17 PM   #6
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nice job
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Old 07-10-2008, 12:28 AM   #7
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Rob

Very nice!!!

Those bolts look a little different than the ones on the Z06, maybe because of the steel vs. alumininum frame.

That's a great looking job - I think any tech inspector will look at those and pass the installation with flying colors.

Did you do that on both sides? I think I read that if you're going to have a passenger/instructor you need the same harness setup on both sides.

Bob
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Old 07-10-2008, 07:26 AM   #8
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That's a good looking set up Rob.
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Old 07-10-2008, 09:27 AM   #9
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Rob

Very nice!!!

Those bolts look a little different than the ones on the Z06, maybe because of the steel vs. alumininum frame.

That's a great looking job - I think any tech inspector will look at those and pass the installation with flying colors.

Did you do that on both sides? I think I read that if you're going to have a passenger/instructor you need the same harness setup on both sides.

Bob
Thanks to all who responded for the kind words! I have absolutely no doubt that this set-up is [far] stronger than stock. I'm happy to get the comment about "...the same harness set-up on both sides"... I'll check it out.

Even though I put sealer around the holes as I was putting this all back together, I think that I will add some spray-on "undercoating" as an added protection against any water working it's way into the structure.

I know that this is a dumb thread, I just wanted to post it thinking that sooner or later someone else will probably want to know about those bolts.

Rob
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Old 07-10-2008, 12:16 PM   #10
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Quote:
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...... I have absolutely no doubt that this set-up is [far] stronger than stock. I'm happy to get the comment about "...the same harness set-up on both sides"... I'll check it out........

Rob
Rob

I guess you're doing this for a harness setup for HPDE's or Auto-xing.

If you run a stock seat and regular street seat belt setup, that (for now) will be suitable for most track events.

However, if you run an aftermarket harness ALL the track day event sponsors are adopting the PCA rules that require a race seat with shoulder strap pass-through slots if you run a 5 or 6 point harness - you will NOT be allowed to run a stock seat, even if you put slots in it for the straps to run through the seat back.

The rules will require the anti-submarine crotch straps to come through the seat bottom - not under the front of the seat.

If you're running solo then all you'll need is your driver's seat set up properly.

If you're running in a run group that requires an instructor at any time, the rules require that the passenger seat be an "equal" set up to the driver's seat. You could have a Recaro on one side and a Sparco on the other side, but you'd need to have an acceptable harness on both sides.

I just attended the recent NCM HPDE at VIR and ran with the stock seats and belts, but if you had a harness system I believe the tech inspectors were requiring compliance with the new rules.

There has been lots of discussion about it over on the Auto-x/Road Race section of the forum. Here's one thread about it:

http://forums.corvetteforum.com/show....php?t=1972285

Bob
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Old 07-10-2008, 03:39 PM   #11
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Quote:
Originally Posted by BEZ06 View Post
Rob

I guess you're doing this for a harness setup for HPDE's or Auto-xing.

If you run a stock seat and regular street seat belt setup, that (for now) will be suitable for most track events.

However, if you run an aftermarket harness ALL the track day event sponsors are adopting the PCA rules...

Thanks, Bob for the informative and helpful post (and the link, as well).

All of this just goes to reveal what a phoney I am. I really do have to admit that I'm going to all this trouble without any real intention of any 'track' time (of course, that could change in a heartbeat).

I've been thinking that I had pretty much gotten all of that ('racing') out of my system back in the early 1980s when I was active in Porsche Club of America. I didn't have any recognizable talent, but did have excellent enough instruction that I managed to win First in Class in our local PCA region's autocross and track series for the year in 1983 (two nice trophies... still got 'em!).

Maybe I just want the 'Vette to look 'trackable'... but, who knows?

Yeah, I know... I'm pathetic!!!
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Old 07-10-2008, 03:49 PM   #12
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you should be okay what are the odds of the new lower down bolts getting sheared off and you go flying in the air still strapped to yer seat
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Old 07-10-2008, 03:49 PM
 
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