Rad cap question

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Model T Ford Forum: Forum 2014: Rad cap question
Top of pagePrevious messageNext messageBottom of page Link to this message  By Colin Mavins on Monday, December 29, 2014 - 10:37 am:

just going through boxes at Dads and came across 5 of these rad caps, are these Ford or after market. These boxes have been sitting around for forty plus years. Thanks Colin


Top of pagePrevious messageNext messageBottom of page Link to this message  By Colin Mavins on Monday, December 29, 2014 - 11:17 am:

sorry im getting old


Top of pagePrevious messageNext messageBottom of page Link to this message  By Steve Jelf, Parkerfield KS on Monday, December 29, 2014 - 12:10 pm:

Yep, stock T cap. There were variations over the years.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Colin Mavins on Monday, December 29, 2014 - 01:08 pm:

Thanks Steve I know the brass stuff but when it comes to the later stuff I'm lost and we have to get down to the stuff for the 12 and peddle the rest. Dads has collected T stuff for 50 years.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Steve Tomaso - Milton,WA on Monday, December 29, 2014 - 02:43 pm:

Are those made of aluminum, Colin ?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Colin Mavins on Monday, December 29, 2014 - 02:45 pm:

Yes Steve they are that's why I was puzzled


Top of pagePrevious messageNext messageBottom of page Link to this message  By Steve Jelf, Parkerfield KS on Monday, December 29, 2014 - 03:13 pm:

Then I take it back. According to the encyclopedia the only caps containing aluminum were die cast, and these look stamped. Here's Trent's article in the encyclopedia:

This is the radiator cap used on the 1917 and later models. Prior radiator caps were of polished brass in a few variations in style. The earliest design had rather high and sharp fins. The fin design was modified in later 1909 and by about 1913 the fins were down to the “standard” size.

6/27/16 Adopted. It was made of stamped brass, nickel plated and polished.

1/17/18 Redesigned from a brass stamping to a die- casting. “This change to take effect a once. All caps and plugs on hand to be used up.”

6/4/18 Redesigned and changed material from Die-casting alloy to “S” brass. Caps to be nickel plated and polished on the outside. “This change makes the design of the cap the same as T-1103-B (the pre-1917 brass radiator cap), we have therefore specified the same size of stock that is being used for T-1103-B, also that these caps be made because the aluminum in the die cast cap corrodes too easily and is to take effect at once. Die cast caps to be used up.”

8/20/26 A flange was added at the bottom of the cap where it contacts the radiator cap gasket.

On a related note, I found in the Ford Motor Companies legal files correspondence indicating that the Bridgeport Brass Co. had filed suit about this time against Ford Motor because Bridgeport Brass claimed to have a patent on the stamped brass design of radiator cap. The court eventually threw out the suit.

~ Trent Boggess


Top of pagePrevious messageNext messageBottom of page Link to this message  By David Dewey, N. California on Monday, December 29, 2014 - 03:29 pm:

without looking anything up, I don't believe Ford ever made aluminum nor pot metal (either material--they're not the same thing) radiator caps. These are likely an early aftermarket, or reproduction cap.


Top of pagePrevious messageNext messageBottom of page Link to this message  By David Dewey, N. California on Monday, December 29, 2014 - 03:42 pm:

Well, I see my dial-up connection failed me again--thanks Bruce for the real "scoop" Wow, very interesting--I wondered if the two metals would be a problem (radiator neck & cap)


Top of pagePrevious messageNext messageBottom of page Link to this message  By Allan Bennett - Australia on Monday, December 29, 2014 - 05:22 pm:

Steve, the circle on the underside of the first photo indicates that that cap was diecast. Perhaps you were correct in the first place.

Allan from down under.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mark Strange on Monday, December 29, 2014 - 05:25 pm:

My car came to me with a new (in 2008) radiator and a plated, pot metal reproduction radiator cap. I found a nice original stamped cap at a swap meet, but it was such a tight fit in the reproduction radiator neck (even after chasing and lubricating the threads) that I went back to my reproduction cap.


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