[Healeys] Fwd: Overdrive pressures

[Roger Grace]

Sorry I neglected to copy the list.
On 2x BJ8 have upgraded the OD hydraulics including new accumulator main
spring O ring piston and the NR and operating valve balls and springs as a
package from OD Spares in UK. Both cars now have pressure over 500 psi - a
non calibrated gauge I will admit to. Really do prefer the O ring style
piston. BTW this piston has a slightly larger diameter of 1.196 compared to
the 1 1/8 per original. So you have to replace the accumulator as well.
rg

---------- Forwarded message ---------
From: Roger Grace <roggrace at telus.net>
Date: Mon., Aug. 7, 2023, 8:43 p.m.
Subject: Re: [Healeys] Overdrive pressures
To: David Wirken <dmw at wirkenphoto.com>


No !
Suspect that your replacement piston uses an O ring instead of the old
sleeve rings. That, together with a new spring usually ups the pressure. Is
it engaging too quickly with a jolt ?
rg

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On Mon, Aug 7, 2023 at 8:37 PM David Wirken via Healeys <
healeys at autox.team.net> wrote:

> Recently overhauled OD when testing the pressure, it measured 500 to 550
> psi on the gauge.The book says it should be 470 to 490 PSI and drops about
> 80 PSI when engaged or disengaged and jumps back up to 470 PSI very
> quickly.
> Question is " should I be concerned about the high numbers I am
> experiencing ?
>
> THANKS for your input
>
> Dave
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