Your original is correct with a 1" (25.4 mm) filler neck and the new one
is what they normally are- 3/4" or 19 mm. You need to get a new
radiator cap. What you should do is allow the radiator to find it's own
level. If you keep filling it up, it will just reject what it does not
want. Take a look at the level it likes and maintain it there,
otherwise it will come out of the overflow.
Charlie
Pieter and Linda wrote:
> I haven't had any real problems with my car over heating in anything but
> extreme conditions but I do get a lot of coolant loss through the overflow
> pipe. I have tried a number of different brands of rad caps with no real
> difference. I recently bought a new alloy radiator and noticed that the depth
> of the filler neck is much shallower. My original radiator is 26mm deep,
> measured from the top down to the sealing lip for the rubber cap seal. The
> alloy is only 19mm deep and you really have to push the cap down to get it on.
> I suspect that the original may have had a different filler neck fitted at
> some stage.
> Could somebody please measure their radiator for a comparison? The car is a
> BJ7,
> thanks
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