Greetings... If you have the original radiator neck, than that is probably
where your problem lies. The neck is 1 inch deep as opposed to the 3/4 inch
depth for anything "modern." In order for a recovery system to work, the cap
must seal around the top of the neck as well as the bottom or air will get
past the cap and into the system when it cools. Look at a "modern" cap and
you will see some sort of gasket next to the body of the cap. I've not found
a
cap for the 1 inch neck that has this seal. Next time you have your
radiator in for servicing, have them change the neck to a 3/4 inch and you can
use a
proper cap. Another route is to use a pressurized recovery system where the
pressure cap in on the recovery tank and a plain cap is on the radiator.
This is the system used on (dare I say it) BMC cars. TJ
Check out the new British Cars Forum:
http://www.team.net/the-local/tiki-view_forum.php?forumId=8
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