[Healeys] Radiator cap with expansion tank.

[Michael Oritt]

By running the hose from the radiator neck to the *bottom* of the
"expansion" tank you will have created a coolant recovery system--the
slight vacuum created in the radiator by the engine's cooling down pulls
open and unseals the pressure plate on the radiator cap, thus "recovering"
the overflow back into the radiator.  Probable result:  no more coolant on
the garage floor and no need to top things off.

Best--Michael Oritt

On Sat, Oct 11, 2025 at 2:24 PM sbyers--- via Healeys <
healeys at autox.team.net> wrote:

> Simon, I have an expansion tank in my BJ8 using the original metal tank
> from an MG Midget.  I also have the stock 7 psi cap on both the radiator
> and the overflow tank and a clear “overflow” hose on the radiator neck to
> the tank.  The tank captures any overflow from the radiator and I can see
> the system operate with the clear tubing.  When hot, the flow is out to
> the tank and back into the radiator as it cools.  Excess coolant in the
> overflow tank can flow out to the ground through the tank overflow
> connection.
>
>
>
> Steve Byers
>
> BJ8 Registry
>
> AHCA Delegate at Large
>
>
>
> *From:* Healeys <healeys-bounces at autox.team.net> *On Behalf Of *Simon
> Lachlan via Healeys
> *Sent:* Saturday, October 11, 2025 11:32 AM
> *To:* 'Healeys' <healeys at autox.team.net>
> *Subject:* [Healeys] Radiator cap with expansion tank.
>
>
>
> Forgive another stupid question but it’s sensible to be sure……….
>
> Am I right in assuming(!) that, if one fits an expansion tank, the
> standard cap is moved from the radiator to the expansion tank and is
> replaced by a blanking(?) cap ie one which has no spring, no means of
> relief etcetc? Seem logical to me but logic has let me down before.
>
> Simon
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