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Joined: May 2015
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'Bolter
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Does anyone have any photos or parts diagrams of how the radiator mounts to the front cross member? All my trucks had the doghouses removed when I got them. Jim Carter and others sell the rubber spacer but nothing else.. bolts, springs etc. The springs from the Big truck are all I have so do I need to reuse those for my 39 1/2 ton GMC? Or did the smaller trucks not have these. I've attached photos of my big truck.
Attachments
20240227_173613.jpg (377.09 KB, 221 downloads)
20240227_173616.jpg (314.5 KB, 220 downloads)


~ Daniel Davidson
1939/1940 Chevrolet/GMC
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Here are a few pictures of my ‘46 gmc 1/2 ton- for what they are worth. It has been restored.
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IMG_2659.jpeg (159.02 KB, 196 downloads)
IMG_2660.jpeg (174.88 KB, 195 downloads)
IMG_2661.jpeg (184.78 KB, 192 downloads)

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Here are several photos of the radiator mounting hardware and rubber bushings on my restored ‘46 Chevy 1/2 ton.
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IMG_1710.jpeg (192.8 KB, 180 downloads)
c2bc17863fba8d7c-photo.jpeg (203.97 KB, 177 downloads)
de2d91f03743da7d-photo.jpeg (174.05 KB, 179 downloads)

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Do you know the reason for the two rubber pads?


~ Daniel Davidson
1939/1940 Chevrolet/GMC
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Daniel
I don’t really know for sure. My guess is the rubber pads, along with the springs/bolts, help prevent radiator damage from road vibration.

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Any suggestions for what springs to use?
It was suggested that valve springs might be used for this application, but I am hoping that someone has a specific part number or other description of a spring that they have found appropriate.
Since I don't have any used valve springs sitting around, I will have to purchase something for my '40 1/2 ton from somewhere.

Thanks!
Nick


Nick
1940 KC Model 1/2 Ton Pickup Project
(with '37-'39 Bed and what we think is a '42-'46 Frame)
Taos, New Mexico
Joined: Feb 2008
Posts: 1,123
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Either one of these two options should work. Someone long ago suggested these. They worked out fine.
Note that the prices shown might be different now.
When I bought the ones used they were on an end cap at the NAPA dealer.
Attachments
IMG_2448.png (4.31 MB, 111 downloads)
IMG_2447.png (2.27 MB, 111 downloads)

Last edited by 46Sparky; 08/21/2024 2:53 PM.
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Nick,
I used valve springs and retainers on my 39 Chevy from an 80 horse Corvair engine (small and just right). I live in Las Cruces and have a shed full of Corvair parts. Should be a way to get some to you (free), However I'm leaving town for the next few weeks. If interested, get hold of me when I'm back in mid-September.

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Nick, I'll see if I can measure my springs from my 40 GMC and maybe McMaster Carr will have a comparable. Not sure how to measure spring tension though.


~ Daniel Davidson
1939/1940 Chevrolet/GMC
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Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Joined: May 2015
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Springs are measured in pounds per inch of compression (or tension). If you have a bathroom scale and some weights to put on top, compress it till you get an inch of length change. You'll need to keep the weights from falling off, though. You might be able to just compress the spring by hand and read the scale on the fly. There are tools to measure valve spring compression, but they're kind of pricey.

[on edit] Here's a listing from the 1929-1954 Master Parts Catalog for the radiator support springs. It has some dimensions that might help. They sold for the princely sum of 13 cents each in 1954.
Attachments
Radiator support spring.jpg (24.02 KB, 81 downloads)

Last edited by klhansen; 08/22/2024 12:24 AM.

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
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Thanks for the responses to my question as to what springs to use in place of the originals.

I will pursue the leads suggested!

Nick


Nick
1940 KC Model 1/2 Ton Pickup Project
(with '37-'39 Bed and what we think is a '42-'46 Frame)
Taos, New Mexico
Joined: May 2015
Posts: 180
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My springs are 1 3/16" long and the OD is 1 1/8" ID is about 11/16"


~ Daniel Davidson
1939/1940 Chevrolet/GMC
Follow his Project Journal
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Posts: 382
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Thanks, Daniel.

They seem close enough to Kevin's specs from the '54 Master Parts Catalog.

Nick


Nick
1940 KC Model 1/2 Ton Pickup Project
(with '37-'39 Bed and what we think is a '42-'46 Frame)
Taos, New Mexico

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