Squarebirds, Rocketbirds, and Fifties/Sixties Ford Discussion Forum

Squarebirds, Rocketbirds, and Fifties/Sixties Ford Discussion Forum (http://squarebirds.org/vbulletin/index.php)
-   1955 To 1957 Little Birds - General Technical Discussion (http://squarebirds.org/vbulletin/forumdisplay.php?f=61)
-   -   Radiator cap question (http://squarebirds.org/vbulletin/showthread.php?t=18434)

ss396t6 02-14-2015 09:37 PM

Radiator cap question
When the '55-'57 Thunderbirds were new what radiator cap came on the radiator? PSI?


YellowRose 02-14-2015 10:02 PM

Radiator cap question
Hi Scott! I hope you are still not having radiator problems with that new one. According to the CASCO website, '55-'57's use a 7lb radiator cap, cost, $10.90, Part # 8100B.


ss396t6 02-15-2015 09:40 AM

No, the radiator is performing great. I am asking about original issue radiator caps from a correctness standpoint.

I believe the original radiator caps were stamped S. M. CO. with a patent number around a large domed rivet. One ear might have R-7 and large, raised words on the perimeter were TIGHTEN and REMOVE SLOWLY with arrows. However, I am not certain of this as so many reproducers have several caps they claim as "exact reproduction" which usually aren't.


YellowRose 02-15-2015 10:16 AM

Radiator cap question
Try contacting some of the NOS and Obsolete Parts places listed in the Advertisements Forum, or Stan Levy to see what he has. The part # is probably B7-8100-B or maybe B5-8100-B, or B6-8100-B. They should all be the same. There could also be an A after the number instead of the B.

jopizz 02-15-2015 10:26 AM

Tee-Bird products shows that they have an exact reproduction 55-57 Thunderbird cap but it says 13 lbs.



Joe Johnston 02-15-2015 11:02 AM

I have the 56 Shop manual handy and it states:

"The cooling system of the passenger car is pressurized at approximately 13 psi."

on page 115. Subsequent pages make no mention of a cap for Thunderbirds.

Page 363 in the spec section states:

"Cooling system on all cars is pressurized to 12-15 pounds."

This section does give Thunderbird specific specs, but no mention of a different rating for the cap on a Thunderbird, but I will check other sources.

YellowRose 02-15-2015 12:13 PM

Radiator cap question
Apparently, CASCO, a major supplier of parts for Babybirds, does not have it correct then. Their ad shows it is a 7lb cap....

Joe Johnston 02-15-2015 01:17 PM


Apparently, CASCO, a major supplier of parts for Babybirds, does not have it correct then. Their ad shows it is a 7lb cap..
Perhaps...............but it may depend on their reference source.

page 23 of the Compilation of Product Service Letters dated 12/29/1954 states the cap is to be of the 12 - 15 lb variety instead of the 7 lb rating used for 1954 products. Also is a footnote to revise the 55 Ford car Shop Manual (page 338 secton 8) to read "Cooling system is pressurized to 12-15 pounds on all cars and Thunderbirds." The 55 Shop Manual (which I don't have) should state 7 lb cap originally - so that may be the source of confusion.

jopizz 02-15-2015 01:45 PM

1 Attachment(s)
Here's what the Master Parts Catalog shows. It looks like 1954 was the last year a 7 lb cap was used.


YellowRose 02-15-2015 02:16 PM

Radiator cap question
I have just brought this to CASCO's attention with an email and pointed to the comments here on the Forum regarding this. As jopizz points out, and the other posts do, the last year for a 7lb radiator cap on a Ford product was on the years prior to 1955.

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