Radiator wellnuts!!! - Team Camaro Tech
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post #1 of 17 (permalink) Old Apr 5th, 11, 11:16 AM Thread Starter
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Radiator wellnuts!!!

Hi guys,
putting radiator back in and have the Rick's wellnuts and bolts. My question is what is the point of them in the first place??
I imagine it is for cushioning the radiator, but why? And if that's their purpose, why aren't they on all four holes?

Fill me in. Are they really necessary? They seen like they wiuld deteriorate rather quickly and maybe allow the radiator to flop or something on that side.

RJ Bailey
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post #2 of 17 (permalink) Old Apr 5th, 11, 11:19 AM
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Re: Radiator wellnuts!!!

I have changed them out every time I am working in this area as they do flex and allow your radiator to absorb some of this flex as it does in the subframe. So where do you want the flex, in the radiator or rubber encased nut.

You can get these wellnuts at Lowes or Homedepot. Not a hard item to find.

Don
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post #3 of 17 (permalink) Old Apr 5th, 11, 11:26 AM
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Re: Radiator wellnuts!!!

Radiators expand and contract a bit as they warm and cool.

I am sure they cost GM a bit more to use than a regular bolt/weld nut, so they would not have been used if there was not a good reason to do so.

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post #4 of 17 (permalink) Old Apr 5th, 11, 12:09 PM
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Re: Radiator wellnuts!!!

Recently bought some at Lowes.

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post #5 of 17 (permalink) Old Apr 5th, 11, 12:34 PM
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Re: Radiator wellnuts!!!

Quote:
Originally Posted by Eric Kammerer View Post
Radiators expand and contract a bit as they warm and cool.

I am sure they cost GM a bit more to use than a regular bolt/weld nut, so they would not have been used if there was not a good reason to do so.
That is exactly why they are there. You will see them on new cars as well. A common item that can be purchsed at most well stocked hardware stores.
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post #6 of 17 (permalink) Old Apr 5th, 11, 12:37 PM
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Re: Radiator wellnuts!!!

I imagine they used them for flex of the car and heat expansion. You can get them at Ace. I think they are worthless. I have had some tear and pull out. I use one on the bottom left only because the hole doesn't go all the way through the core support. The upper left one, I use a grommet and a brass insert inside the grommet. Both gotten at Ace. The brass insert needs to be ground down a little to be the same thickness as the grommet. The insert has a ID of a 1/4". Then I just use a bolt, couple of washers and a nylock nut. Haven't had an issue since.
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post #7 of 17 (permalink) Old Apr 5th, 11, 02:43 PM Thread Starter
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Re: Radiator wellnuts!!!

Thanks for all the good ideas. i put them in, but we will see how it all stays together. Not sure the engineers were on the right track there, but maybe.

RJ
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post #8 of 17 (permalink) Old Apr 5th, 11, 07:15 PM
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Re: Radiator wellnuts!!!

Quote:
Originally Posted by RJBaileyrn View Post
Thanks for all the good ideas. i put them in, but we will see how it all stays together. Not sure the engineers were on the right track there, but maybe.

RJ
I bolted my radiator in about 10 yrs and 30,000+ miles ago using them and they still hold fine. They dampen the core which is soldered together. If the core was bolted hard to the support I bet it would start leaking (cracked solder joints) long before the rubber nut-certs give out... I'm sure there are 40 year cars out there with the orig rubber still in place doing the job!

...Dennis

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post #9 of 17 (permalink) Old Apr 5th, 11, 07:43 PM
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Re: Radiator wellnuts!!!

The originals on my vert are still in place doing the job. The hot rod however ripped them out the first season of wheelies and my heavy Ron Davis radiator is bolted in with no rubber at all any more.

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post #10 of 17 (permalink) Old Apr 5th, 11, 07:52 PM
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Re: Radiator wellnuts!!!

F**d uses them too.

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post #11 of 17 (permalink) Old Apr 6th, 11, 03:39 AM
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Re: Radiator wellnuts!!!

Quote:
Originally Posted by RJBaileyrn View Post
Thanks for all the good ideas. i put them in, but we will see how it all stays together. Not sure the engineers were on the right track there, but maybe.

RJ
They are on my '67 with no issues. And they were on a '95 Wrangler I had in for paint. If they were NG I think the engineers would have eliminated them by now. They don't fare well upon removal but replacements are cheap and easily obtained.
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post #12 of 17 (permalink) Old Apr 6th, 11, 09:11 AM Thread Starter
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Re: Radiator wellnuts!!!

I got them in, and they are much stronger than I had thought they would be. Didn't think about the solder. I like my car to be reasonably original, except for the engine, since, when I bought the car, it didn't have the original anyway. Glad I put them in now, but still not sure how much to tighten.

RJ
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post #13 of 17 (permalink) Old Apr 6th, 11, 10:19 AM
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Re: Radiator wellnuts!!!

Flatten the lock washer, then one flat of the head.

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post #14 of 17 (permalink) Old Apr 6th, 11, 04:53 PM
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Re: Radiator wellnuts!!!

good thread! i just finished installing a brand new 3" thick Griffin for my BBC and ditched the well nuts (driver side) and thru bolted.

Didn't really think about the radiator support twisting (600+ torque) or the thermal expansion. I'll go back to new well nuts but will likely throw one slightly "loose" thru bolt just in case

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post #15 of 17 (permalink) Old May 23rd, 20, 02:17 PM
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Re: Radiator wellnuts!!!

Was wondering about this myself, going to be mounting my Cold Case. A lot of FB guys like using rubber grommets as a "vibration pad" on all four mounting bolts. Put the grommet between core support and radiator side mount.

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