The right radiator cap

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The right radiator cap

Post by scimjim » Tue Sep 22, 2020 10:20 am

3AE613EA-CE85-4142-BF1E-0A3EA3E8F03B.gif (4.26 KiB) Viewed 250 times

Jim King


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The right radiator cap

Post by philhoward » Tue Sep 22, 2020 10:24 am

A picture tells a thousand words. 8)

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Dennis Nicholas
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The right radiator cap

Post by Dennis Nicholas » Wed Sep 23, 2020 9:23 am

philhoward wrote:
Tue Sep 22, 2020 2:41 am
Dennis Nicholas wrote:
Mon Sep 21, 2020 11:23 pm
Thomaswo wrote:
Wed May 27, 2020 8:00 pm
I googled the ford part no. now, but most of the links were wrong. Most caps are short reach (app. 24 mm height) but we need long reach (34 mm). Else it wont fit.
Beware that some caps with the correct part number at a supplier may be just the tiniest bit short so that the bottom seal does not seal on the baffled me for a while when I put a new one in......water gets pumped out into expansion tank and overflows.
I’d say that was a badly manufactured cap though, not the wrong cap. Which supplier so one can avoid, Dennis?
Barnstaple, Devon firm no longer exist. It was on books as all the correct parts numbers and car identity.

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The right radiator cap

Post by Scim8tar » Thu Sep 24, 2020 10:46 pm

Buying a rad cap can be confusing due in part to the way seller's measure them, some use seal to seal and some use total height, best thing is to measure the neck depth then add on approx 3 mm for seal to seal measurements and a further approx 4 mm for total height.
long reach was used on early MG's (1inch neck depth), cap (approx 1"1/8 seal to sea)l, then later 3/4" neck depth, you could struggle to find a 13lb long reach, i think the nearest will be 15lb and 26mm seal to seal (approx 30 mm) total height.
Total height also varies due to different recovery valve designs.


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The right radiator cap

Post by Scim8tar » Fri Sep 25, 2020 9:28 am

I stand corrected, is this the one you need ? ... SwQZdcUtg-


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The right radiator cap

Post by PilotLight » Fri Sep 25, 2020 1:24 pm

I love this forum!
I'm learning so much about my car, I've just fitted a thermostat to my own 6a and it's really interesting to understand how this cooling system works.

I'm off outside to check mine has the right pressure and height cap!

Thanks for sharing your experience guys.


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