Author Topic: Radiator cap  (Read 451 times)

emptyhead

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Radiator cap
« on: June 28, 2021, 03:16:18 PM »
What are you guys using for a radiator cap. The fuel cap type I have even with a rubber gasket leaks like crazy. Thanks

brit plumber

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Re: Radiator cap
« Reply #1 on: June 28, 2021, 03:54:07 PM »
Is the system over pressurising? Can you get a NOS radiator cap?
1942 VEP GPW

coreyelliott

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Re: Radiator cap
« Reply #2 on: June 28, 2021, 06:18:02 PM »
Do you have a surge tank?  Are you sure you're using a fuel cap type of lid on your radiator?  The cap on the radiator should not be vented, as it should push any overflow coolant into the surge tank.  The surge tank will have a vented cap.  If you are using a fuel cap on the radiator then it is probably vented.  When any significant pressure builds up in the radiator as the coolant warms up, the vent on the fuel cap you are using could be causing the leak.

Corey

1941 Autocar M2A1 (M2-13)

emptyhead

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Re: Radiator cap
« Reply #3 on: June 29, 2021, 03:01:22 AM »
I am using a surge tank, the cap is a slant fuel cap just wondering if anyone has a part number for a radiator cap that fits.

brit plumber

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1942 VEP GPW

emptyhead

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Re: Radiator cap
« Reply #5 on: June 29, 2021, 10:44:13 AM »
Got one like that off of Gary and it rusted out in less then a year. Tried the slant fuel tank one and that won’t seal either. Seen pics of one that looks like the cap on the surge tank but bigger. But can’t find it.

coreyelliott

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Re: Radiator cap
« Reply #6 on: June 29, 2021, 02:55:10 PM »
The Slant fuel cap is vented and is more than likely your problem. Ask me how I know. ;D I have heard of people sealing the vents in the cap successfully, but I’ve never tried it.

Corey
1941 Autocar M2A1 (M2-13)