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post #31 of 38 (permalink) Old 06-04-2018, 05:26 PM
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Rick,

Maybe I am over-engineering, but I am surprised that coolant is returning from your recovery tank at all. Vented caps are not designed to seal against the top of the radiator filler neck. Fords in the early 60s used vented caps with those Harrison (De Gas) tanks that had no recovery system. You need a non-vented cap on your system.


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post #32 of 38 (permalink) Old 06-04-2018, 10:20 PM Thread Starter
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Possibly...

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Originally Posted by gsides9 View Post
Rick,

Maybe I am over-engineering, but I am surprised that coolant is returning from your recovery tank at all. Vented caps are not designed to seal against the top of the radiator filler neck. Fords in the early 60s used vented caps with those Harrison (De Gas) tanks that had no recovery system. You need a non-vented cap on your system.


Glen
...but I'm following a suggestion from Greg_M, a knowledgeable person on the site.

My understanding on the early Ford systems, which I've posted comments on several times, is that the "expansion tank" has a void space for the fluid to go into when the engine is hot. If the normal high temperature is exceeded the excess displaced fluid will spill out the over flow tube and is lost. The system is closed and uses a 16lb cap that is not vented, the expansion tank (actually the whole cooling system) is under pressure any time the engine temperature is up.

Regards, Rick


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Last edited by CRZN 427; 06-04-2018 at 10:26 PM.
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post #33 of 38 (permalink) Old 06-04-2018, 10:35 PM
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Quote:
Originally Posted by gsides9 View Post
Rick,

Vented caps are not designed to seal against the top of the radiator filler neck.

Glen
This one is.

Greg
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post #34 of 38 (permalink) Old 06-05-2018, 05:57 AM Thread Starter
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Same For The One I Got...

Stant 10231 Cap.

https://www.speedwaymotors.com/Stant...iABEgK1iPD_BwE

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post #35 of 38 (permalink) Old 06-05-2018, 10:42 AM
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Yep. The only difference is the lever.

Greg

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post #36 of 38 (permalink) Old 06-05-2018, 01:27 PM
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There is a reason that it says vented.

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post #37 of 38 (permalink) Old 06-05-2018, 02:24 PM
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And the reason is not because it does not seal against the radiator neck or any other place a conventional cap seals at, it's because the vacuum valve remains open to the overflow bottle ALL THE TIME (during heating and cooling) cycles unless the sufficiently coolant rushes past it as in a boil over and closes the vacuum valve, sealing the system as a conventional cap does.

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post #38 of 38 (permalink) Old 06-05-2018, 04:14 PM
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Thanks for the explanation. I learned something new today. Back in the day non-vented caps had a brass-looking disc where the cap would seal against the radiator, just looked at one last night. Now I'll be figuring out the advantage of keeping it vented (not building pressure) until the hot antifreeze hits the cap.


Glen

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