Hi Randall
I think you are right about that except in this instance there has been a
smaller ball rattling around in there so I would suggest this is not so much
a re-seating operation as a seating operation and should be done!
Graham.
2500PI MKII
Sprinted Dolomite
2000 MKI
Toledo
1300 Front Wheel Drive
http://members.tripod.co.uk/TriumphIW/index.html
----- Original Message -----
From: Randall <randallyoung@earthlink.net>
Cc: Nyberg Peter <Peter.Nyberg@lio.se>; <Triumphs@autox.team.net>
Sent: Tuesday, June 13, 2000 5:11 PM
Subject: Re: Potential TR4 O/D ball size
>
> 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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