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EFV-8 Club Forum / General Ford Discussion / Settle an argument.......

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Discussion Topic: Settle an argument.......

supereal

07-01-2013 @ 7:53 PM

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If it ain't broke don't fix it! I've run a four pound cap on my '47 for 20 years with no problems or loss of coolant.

flathead48

07-01-2013 @ 7:41 PM

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So what is the proper cap to use on a 48, mind would through the water out with out a sealed cap, I was running a 7 lb cap from NAPA which tested to about 5 lbs but never had a problem with it. Thanks

07-01-2013 @ 3:11 PM

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Sounds like a 'push' to me. I bought the "sixer" and drank four of them.... :o)

42wagon

06-30-2013 @ 12:51 PM

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Confusion reigns on this one.

Here is the explanation from the 41 to 48 Ford book.
"The 91A-8100 radiator cap was used from 1939 through 1944." I have one on my 42 and it is not pressurized. The book goes on to say that a new part 41A-8100 was introduced during the war and was designed for a pressure of 3.5 to 4.5 lbs. This cap was standard on the 46 cars and was used on the 47s until April. 41A pressure caps were no longer being installed on passenger car production after that date.

So there you have it. All 46s and some 47s had pressure caps. So your friend that claims that pressure caps were used before 1949 is correct. But your friend with a 48 is also likely to be correct in having a car without a pressure cap.

supereal

06-30-2013 @ 11:30 AM

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It is true that there are no-pressure radiator caps sold for the 37-48 Fords, but most came with the 78-8100 "B" version, which provide 4 pounds of pressure. When seven or ten pound caps became available, the coolant reservoir was required, and some radiators, particularly old ones, may not withstand the pressure. Some modern cars, such as the T-Bird used 14 lb caps! In any case, pressure caps raise the boiling point of coolant, and reduce loss via the overflow.

06-29-2013 @ 7:14 PM

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A buddy of mine has a 1948 original Woodie which is unpressurized. I'm needing for some documentation here......

supereal

06-29-2013 @ 7:09 PM

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Sorry. The 59AB was pressurized well before the 8BA.

06-29-2013 @ 3:27 PM

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When did Ford introduce the pressurized cooling system in it's cars? I say, not until the introduction of the 8BA engine in 1949. I've got a sixer riding on this.......

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