08-30-2020, 02:49 AM | #1 |
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Radiator Cap
the gasket on mine is shot, but I see a few options. What would have been the correct for a 40 deluxe? 4# cap?
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08-30-2020, 06:01 AM | #2 |
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Re: Radiator Cap
The original cap is not a pressure cap. Adding a pressure cap will eventually bulge the upper brass tank of the radiator.
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08-30-2020, 07:10 AM | #3 |
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Re: Radiator Cap
DMMuir, Terry is as usual, correct.
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08-30-2020, 12:49 PM | #4 |
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Re: Radiator Cap
DMMuri did not ask about a pressure cap, he asked about a gasket. Is not the part of an original cap that seats against the radiator cap called, and in fact is a gasket?
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08-30-2020, 01:51 PM | #5 |
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Re: Radiator Cap
I kind of asked about both.
Non pressure is good to know. The gasket on mine is looking rough, but if it isn't sealing pressure it's likely not as big of a deal as I was thinking. I was thinking the pressure may help it run a bit cooler, but that's a no. I will continue working on the correct air directors and think about flushing the engine and having the radiator boiled out. Thanks everyone |
08-30-2020, 02:01 PM | #6 | |
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Re: Radiator Cap
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Quote:
The older Ford v8 radiators were not designed for pressure systems and will not tolerate much. |
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08-30-2020, 09:39 PM | #7 |
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Re: Radiator Cap
DM. I don't know if the '40 rad cap and the '46 rad cap are comparable, but I "fixed" mine with some hi-temp black silicone seal, and planned to buy a replacement. I ran a 1/4" high bead of silicone around the existing gasket, at midpoint between the center metal disc and the outer perimeter of the gasket. I placed the cap gasket side up on the workbench, placed a piece of waxed paper over the rad cap, and placed a 1/2" x 4" x 4" piece of flat bar on top. Left it for two days to set, peeled of the wax paper, trimmed the outer edge with a knife and installed it. I ran it for one summer, before replacing, and no leaks.
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08-30-2020, 10:47 PM | #8 |
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Re: Radiator Cap
Original side fill '40s were Not pressurized. They would dump water thru the top tube. Right??? Newc
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08-31-2020, 08:16 PM | #9 |
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Re: Radiator Cap
I did not realize a 1940 required a non pressure cap.I have been running a 4# for years.What would be the chances of it running cooler with a non pressure cap?Who sells the best non pressure cap?
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08-31-2020, 08:31 PM | #10 |
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Re: Radiator Cap
Caps or pressure have nothing to do with running temperature. It has to do with the boiling point.
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08-31-2020, 08:48 PM | #11 |
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Re: Radiator Cap
A pressure cap on a 40 radiator still will not build any pressure. The overflow tube goes straight to the atmosphere.
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08-31-2020, 09:53 PM | #12 |
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Re: Radiator Cap
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08-31-2020, 10:55 PM | #13 |
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Re: Radiator Cap
Correct me if I'm wrong but with the overflow tube coming off the side of the filler neck, if you are using a pressure cap it pressurized the system and overflows or releases thru the tube once that pressure is reached? If the correct pressure cap is used.
Wouldn't a pressure cap of at least #4 be beneficial if you lived at a higher elevation to raise the boiling point? |
08-31-2020, 11:16 PM | #14 |
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Re: Radiator Cap
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09-01-2020, 10:56 AM | #15 |
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Re: Radiator Cap
A pressure cap on a '40 will work well only if you also install a Skip Haney 3# overflow tube cap.
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