Hi Jack -
You need that check valve because it prevents backflow caused by
accidental pre-firing in the intake manifold... this can destroy the
diaphram on the servo. Pre-firing can be quite common in healeys (if
the car's out of tune or missing dashpot oil), so you don't want to
risk it.
You are supposed to put it on the hose between the intake manifold and
the servo.
Best Regards,
Alan
'53 BN1 '64 BJ8
On 4/21/06, Ph.J.Aeckerlin <j.aeckerlin@tiscali.nl> wrote:
> Friends,
> I recently ordered a number of parts with a European continental
> supplier, among which a new Lockheed Brake servo. The servo is in
> backorder, but among the parts which I already received I found a check
> valve/non-return valve which apparently is meant to be fitted between
> two hoses. I never ordered this item, but I have vague memories about
> such a valve being used somewhere in a Girling system. Question: should
> I return the part as I never ordered it, or keep it as I apparently
> omitted to order this one together with the new servo?
> Thanks, as usual
> Jack Aeckerlin, The Netherlands
> 1964 BJ8 29432
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