I'll throw in another $.02 worth :
I measured two original balls, both are nominal 5/16" (.3119", .3122").
(One is probably from the pump non-return valve.)
The ball seat in the OD housing is a simple tapered seat, so a 8.3mm
ball should work just fine. The only possible issue I can see is that
the solenoid may not be able to reliably lift the ball against the
increased pressure (due to the slight increase in seat area), but since
racers have been turning up the hydraulic pressure for many years, I
seriously doubt that is a problem. The other restriction is that it
should sit square on the end of the valve rod without touching the sides
of the cavity. But, since the cavity is roughly .450" in diameter, that
shouldn't be a problem either.
IMO you should not "tap the ball into the seat" as a matter of course,
but only to solve a specific problem (OD tries to engage when solenoid
is not engaged, or disengages very slowly).
Randall
59 TR3A TS39781LO
erl@unix.mail.virginia.edu wrote:
>
> It is possible that these OD's actually use
> inch-measure balls in the valves, but I would suspect that they are
> metric.
Michael Ferguson wrote:
>
> However, I don't think you should use a ball that's
> too large either. It fits into a seat that's machined in the OD case itself
> - sort of a countersunk depression.
Nyberg Peter <Peter.Nyberg@lio.se> wrote :
>
> I've found
> an 8.3 mm ball (.3268"). I understand it's not the correct
> size but it can be worth a try.
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