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what is the factory hole/slot under the seat ? #1337264 Wed Dec 11 2019 03:38 AM
Joined: Aug 2019
Posts: 3
B
bandbrent Offline OP
New Guy
Hello I have a 1953 Chevrolet 1300 - the Canadian version of the 3100 (or so I am told)
I have been working to get my truck on the road. I discovered what looks like a factory hole in the floor pan under the seat.
Ok - why is it there? What use does it serve? Is there supposed to be a plug that goes in it? Sorry for all of the dumb questions.
I am still a newbie... and not sure who locally has an old beauty 1300/31oo to ask. Any help would be appreciated in identifying this?
The picture attached shows the slot.

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Re: what is the factory hole/slot under the seat ? [Re: bandbrent] #1337270 Wed Dec 11 2019 06:45 AM
Joined: May 2015
Posts: 1,684
K
klhansen Online
Shop Shark
Are you referring to the keyhole shaped slot? If so I have no clue. The only hole under the seat on my '51 is a bolt hole for a wiring clip toward the driver's side. There's also a 1/2" or so drain hole in the center of the depressed area under the seat.


Kevin
First car '29 Ford Special Coupe
#2 - '29 Ford pickup restored from the ground up.
Newest Project - 51 Chevy 3100 work truck. Photos
Re: what is the factory hole/slot under the seat ? [Re: bandbrent] #1337276 Wed Dec 11 2019 12:01 PM
Joined: Sep 2001
Posts: 29,131
tclederman Offline
Boltergeist
Maybe a "drain hole"?
Here is a "plug". I do not know if it is original style.

Jim Carter sells a few sizes.

I think I had a rubber-like plug in the hole in the floor under my 54 Suburban's 2-person seat.
I dimly recall a vendor selling a replacement rubber-plug? - I think I am dreaming?

Chevs of the 40s - a sizes of metal plugs.

If they were originally metal, they probably rattled free; and, or, they rusted away?

Last edited by tclederman; Wed Dec 11 2019 12:13 PM. Reason: added Chevs of the 40s

Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 15 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler.
Re: what is the factory hole/slot under the seat ? [Re: bandbrent] #1337286 Wed Dec 11 2019 03:53 PM
Joined: Jan 2002
Posts: 2,001
C
cmayna Offline
Shop Shark
Can't enlarge the pic to see which hole the OP is referring to.


Craig's '50 Chevy 3100 5 window
My truck
If I'm not working on my truck or VW camper, I'm fishing with the wife or smoking Salmon.
Re: what is the factory hole/slot under the seat ? [Re: bandbrent] #1337289 Wed Dec 11 2019 04:32 PM
Joined: Sep 2001
Posts: 29,131
tclederman Offline
Boltergeist
On my Macbook laptop keyboard (macOS using Chrome or Safari browser):
- click on the photo/image (to display the image at "natural size)
- move the cursor/pointer over the photo/image
- press (at the same time) the command key and plus key (multiple times for more and more enlargement)

I am using a keyboard.
I have no idea how to do that on a tablet/smart-phone.

Post the device, and the OS, and the web-browser software you are using.
There would be different strokes for different folks/devices.


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 15 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler.
Re: what is the factory hole/slot under the seat ? [Re: bandbrent] #1337302 Wed Dec 11 2019 05:56 PM
Joined: Jul 2000
Posts: 801
G
Gord&Fran Offline
Shop Shark
I have the same thing. The shape of the hole suggests that a bolt passes through the center and slides right or left for a hold down of some sort. Maybe it was used to hold the jack in place?


Gord
----
1954 1/2 ton 235 4 speed
Re: what is the factory hole/slot under the seat ? [Re: bandbrent] #1337314 Wed Dec 11 2019 08:55 PM
Joined: May 2015
Posts: 1,684
K
klhansen Online
Shop Shark
That figure from the FAM the OP posted looks like some sort of cover over the seat riser, and not the floor pan. But maybe that's just an optical illusion or a drafter that didn't draw it correctly. The figure on the next page looks more like what I have, but it's for the big bolts. Again, I don't have a hole shaped like that in my floor pan under the seat. I went out and confirmed when I replied last night.

Makes sense if it's some sort of hold-down slot for something (jack, etc).

On a Windows PC, you can enlarge by holding down Ctrl and hitting +
On my iPhone, the picture opens in a new window and can be enlarged by the typical 2-finger spread/pinch thing.

Last edited by klhansen; Wed Dec 11 2019 09:02 PM.

Kevin
First car '29 Ford Special Coupe
#2 - '29 Ford pickup restored from the ground up.
Newest Project - 51 Chevy 3100 work truck. Photos
Re: what is the factory hole/slot under the seat ? [Re: bandbrent] #1337336 Thu Dec 12 2019 12:59 AM
Joined: Aug 2019
Posts: 3
B
bandbrent Offline OP
New Guy
Hello and thank you.

The picture is bad. My truck is in my fathers garage 40 miles away in Moose Jaw. I will pull the seat and take a real picture to get a better view.
It does look like a key slot.. It is pressed into the floor pan. I am over there in the morning and will try to snap one. Thanks for your input. Brent

Re: what is the factory hole/slot under the seat ? [Re: bandbrent] #1337347 Thu Dec 12 2019 02:34 AM
Joined: Aug 2001
Posts: 1,118
G
Greg_H Offline
Shop Shark
Didn't Denny Graham make a plug to fit that keyhole shape several years back? I always theorized it could have been there to hold up torque tube down the assembly line prior to engine installation or something related to manufacturing like that. It was just a guess though.

Re: what is the factory hole/slot under the seat ? [Re: Greg_H] #1337351 Thu Dec 12 2019 03:01 AM
Joined: May 2015
Posts: 1,684
K
klhansen Online
Shop Shark
Originally Posted by Greg_H
I always theorized it could have been there to hold up torque tube down the assembly line prior to engine installation or something related to manufacturing like that.

My guess is it wasn't there to hold up the torque tube, as that was probably already hooked to the transmission and engine before the cab went on. But like you, that's just a guess, too.


Kevin
First car '29 Ford Special Coupe
#2 - '29 Ford pickup restored from the ground up.
Newest Project - 51 Chevy 3100 work truck. Photos

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