Question About Radiator Cap

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BLB27
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Question About Radiator Cap

Post by BLB27 » Tue Oct 05, 2021 7:59 pm

Should there be a rubber gasket under the radiator cap?
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Humblej
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Re: Question About Radiator Cap

Post by Humblej » Tue Oct 05, 2021 8:02 pm

A Ford stock radiator cap?
Last edited by Humblej on Wed Oct 06, 2021 10:01 am, edited 1 time in total.
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DanTreace
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Re: Question About Radiator Cap

Post by DanTreace » Tue Oct 05, 2021 10:16 pm

Yes

Ford part #3927

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RajoRacer
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Re: Question About Radiator Cap

Post by RajoRacer » Tue Oct 05, 2021 10:29 pm

It was a paper gasket, I believe - not rubber. If you have a motometer or a decorative cap, one could use a rubber gasket or an o-ring to assist in the proper alignment.
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Professor Fate
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Re: Question About Radiator Cap

Post by Professor Fate » Tue Oct 05, 2021 10:40 pm


Lang's has the rubber gasket you need. [Order an extra for later.]

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Re: Question About Radiator Cap

Post by KWTownsend » Tue Oct 05, 2021 11:07 pm

Or stop at your local hardware store, even the big box store, and get a drain gasket.
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Re: Question About Radiator Cap

Post by Allan » Tue Oct 05, 2021 11:18 pm

The problem is the thin edge on the original radiator cap. When you screw the cap down, that thin edge engages right on the outside of any gasket used, and often the gasket is distorted and the cap doesn't seal anyway. If you can find one of the caps with the rolled in edge below the thread, you are on a winner.

I make my own, cut off the end of a red urethane boat trailer roller. They end up about 1/8" thick, have a smaller hole in the middle and thus do not so easily distort. My little finger pulls it out if ever I need to top up the radiator.

Allan from down under.
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Craig Leach
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Re: Question About Radiator Cap

Post by Craig Leach » Wed Oct 06, 2021 1:28 am

Yes gasket, of some kind. unless you like cleaning the hood & windshield. Or goggles if you have Speedster.
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Re: Question About Radiator Cap

Post by Alan Long » Wed Oct 06, 2021 4:59 am

Paper gaskets are rubbish. I use (and love) Part # 3927M from Lang’s.
It’s nice n thick, rounded end that fits nicely into the Radiator Neck, made of Neoprene and cost $1.65. Bargain.
As suggested by others it has a bit of compression to align the Cap or fancy wings or temperature gauges!
Easily flicked out when coolant topping up is needed. Get a couple
Alan in Western Australia
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Re: Question About Radiator Cap

Post by TRDxB2 » Wed Oct 06, 2021 9:59 am

Old thread suggest using a popup drain gasket as it is the same as sold by vendors and available in most hardware & ome Improvement stores
http://www.mtfca.com/discus/messages/59 ... 1460135057
Rad Gasket.png
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Professor Fate
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Re: Question About Radiator Cap

Post by Professor Fate » Wed Oct 06, 2021 8:24 pm


I run my Lang's neoprene [sorry I called it rubber] gasket smooth side down. I have gotten 3-4 yrs out of a new one before replacement.
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