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  #1  
Old 02-14-2015, 09:37 PM
ss396t6 ss396t6 is offline
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Default Radiator cap question

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

Thanks,
Scott
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Old 02-14-2015, 10:02 PM
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YellowRose YellowRose is offline
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Default 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.

http://www.parts123.com/parts123/yb....5Z5Z50000219a#
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Old 02-15-2015, 09:40 AM
ss396t6 ss396t6 is offline
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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.

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Old 02-15-2015, 10:16 AM
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Default 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.
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Old 02-15-2015, 10:26 AM
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Tee-Bird products shows that they have an exact reproduction 55-57 Thunderbird cap but it says 13 lbs.

http://www.tee-bird.com/catalog_prod...d.cfm?id=12670

John
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Old 02-15-2015, 11:02 AM
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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.
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