I would worry about exhaust that might be leaking into the cooling system.
It is a common problem on other types of aluminum engines. It is possible
to take a sample of the coolant and have it tested for the presence of
exhaust gases.
Regards,
Jim B.
----- Original Message -----
From: "Telewest (PH)" <paul.hunt1@blueyonder.co.uk>
To: "V8 list" <mgb-v8@autox.team.net>
Sent: Tuesday, April 23, 2002 1:58 PM
Subject: Water Pressure
> My factory V8 seems to be pumping small amounts of air into the cooling
> system. I have noticed for a while that even if I leave the car to cool
> down overnight pressure is still released when I remove the cap. To cut a
> long story short I have fitted a pressure gauge to the system and find
that
> it pumps up by 2 or 3 lbs each time I run it up to temperature.
Eventually
> it will vomit water out of the 15lb cap when switched off. I'm
temporarily
> running with a 20lb cap which seems to have stopped the vomiting, but the
> pressure is now getting up to about 18lbs just before the fans cut in.
> Whether this is because of the warmer weather or the problem getting worse
I
> don't know. There is no water in the oil or vice-versa.
>
> Any ideas? Minute head gasket leak? Water pump sucking in air?
///
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