Subject: Re: [Healeys] Overdrive pressures

From: John and Kerry Rowe <[email-masked]>
Date: Wed, 9 Aug 2023 13:55:12 +1000

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I would be very happy with those pressures. I wish!

On Tue, Aug 8, 2023 at 1:39=E2=80=AFPM David Wirken via Healeys <
[email-masked]> 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 abou=
t
> 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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<div dir=3D"ltr">I would be very happy with those pressures. I wish!</div><=
br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tue,=
 Aug 8, 2023 at 1:39=E2=80=AFPM David Wirken via Healeys &lt;<a href=3D"mai=
lto:[email-masked]">[email-masked]</a>&gt; wrote:<br></div>=
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr">Recently=
=C2=A0overhauled OD when testing the pressure, it measured 500 to 550 psi o=
n the gauge.The book says it should be 470 to 490 PSI and drops=C2=A0about =
80 PSI when engaged or disengaged and jumps back up to 470 PSI very quickly=
.=C2=A0<div>Question is &quot; should I be concerned about the high numbers=
 I am experiencing ?</div><div><br></div><div>THANKS for your input</div><d=
iv><br></div><div>Dave</div></div>
_______________________________________________<br>
rer" target=3D"_blank">http://www.team.net/donate.html</a><br>
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From: David Wirken via Healeys <[email-masked]>
Date: Wed, 9 Aug 2023 09:53:57 -0500

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Thanks for the answer.

On Tue, Aug 8, 2023 at 10:55=E2=80=AFPM John and Kerry Rowe <jtkarowe@gmail=
.com>
wrote:

>> psi on the gauge.The book says it should be 470 to 490 PSI and drops abo=
ut
>> Question is " should I be concerned about the high numbers I am

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<div dir=3D"ltr">Thanks for the answer.=C2=A0<br></div><br><div class=3D"gm=
ail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Aug 8, 2023 at 10:=
55=E2=80=AFPM John and Kerry Rowe &lt;<a href=3D"mailto:[email-masked]"=
>[email-masked]</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quot=
e" style=3D"margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-styl=
e:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div dir=3D"lt=
r">I would be very happy with those pressures. I wish!</div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Aug 8, 2023 =
at 1:39=E2=80=AFPM David Wirken via Healeys &lt;<a href=3D"mailto:healeys@a=
utox.team.net" target=3D"_blank">[email-masked]</a>&gt; wrote:<br><=
/div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;bo=
rder-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,2=
04);padding-left:1ex"><div dir=3D"ltr">Recently=C2=A0overhauled OD when tes=
ting the pressure, it measured 500 to 550 psi on the gauge.The book says it=
 should be 470 to 490 PSI and drops=C2=A0about 80 PSI when engaged or disen=
gaged and jumps back up to 470 PSI very quickly.=C2=A0<div>Question is &quo=
t; should I be concerned about the high numbers I am experiencing ?</div><d=
iv><br></div><div>THANKS for your input</div><div><br></div><div>Dave</div>=
</div>
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</blockquote></div>
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From: warthodson--- via Healeys <[email-masked]>
Date: Wed, 9 Aug 2023 18:39:10 +0000 (UTC)

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 Dave, I found this in my Spam file. Surely someone has an opinion concerni=
ng the 500-550 psi!Gary Hodson=C2=A0
    On Wednesday, August 9, 2023 at 03:05:56 AM CDT, John and Kerry Rowe <j=
[email-masked]> wrote: =20
=20
 I would be very happy with those pressures. I wish!
On Tue, Aug 8, 2023 at 1:39=E2=80=AFPM David Wirken via Healeys <healeys@au=
tox.team.net> wrote:

Recently=C2=A0overhauled OD when testing the pressure, it measured 500 to 5=
50 psi on the gauge.The book says it should be 470 to 490 PSI and drops=C2=
=A0about 80 PSI when engaged or disengaged and jumps back up to 470 PSI ver=
y quickly.=C2=A0Question is " should I be concerned about the high numbers =
I am experiencing ?
THANKS for your input
Dave_______________________________________________

Archive: http://www.team.net/pipermail/healeys http://autox.team.net/archiv=
e/healeys

[email-masked]

gmail.com

Archive: http://www.team.net/pipermail/healeys http://autox.team.net/archiv=
e/healeys

[email-masked]

[email-masked]

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<html><head></head><body><div class=3D"ydpf9d02591yahoo-style-wrap" style=
=3D"font-family:Comic Sans MS, sans-serif;font-size:16px;"><div></div>
        <div dir=3D"ltr" data-setdir=3D"false">Dave, I found this in my Spa=
m file. Surely someone has an opinion concerning the 500-550 psi!</div><div=
 dir=3D"ltr" data-setdir=3D"false">Gary Hodson&nbsp;</div><div><br></div>
       =20
        </div><div id=3D"ydpe0c6e4beyahoo_quoted_1632753241" class=3D"ydpe0=
c6e4beyahoo_quoted">
            <div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
               =20
                <div>
                    On Wednesday, August 9, 2023 at 03:05:56 AM CDT, John a=
nd Kerry Rowe &lt;[email-masked]&gt; wrote:
                </div>
                <div><br></div>
                <div><br></div>
                <div><div id=3D"ydpe0c6e4beyiv9562235249"><div><div dir=3D"=
ltr">I would be very happy with those pressures. I wish!</div><br clear=3D"=
none"><div class=3D"ydpe0c6e4beyiv9562235249gmail_quote"><div id=3D"ydpe0c6=
e4beyiv9562235249yqt70578" class=3D"ydpe0c6e4beyiv9562235249yqt4883648648">=
<div dir=3D"ltr" class=3D"ydpe0c6e4beyiv9562235249gmail_attr">On Tue, Aug 8=
, 2023 at 1:39=E2=80=AFPM David Wirken via Healeys &lt;<a shape=3D"rect" hr=
ef=3D"mailto:[email-masked]" rel=3D"nofollow" target=3D"_blank">hea=
[email-masked]</a>&gt; wrote:<br clear=3D"none"></div><blockquote styl=
e=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);paddin=
g-left:1ex;" class=3D"ydpe0c6e4beyiv9562235249gmail_quote"><div dir=3D"ltr"=
>Recently&nbsp;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&nb=
sp;about 80 PSI when engaged or disengaged and jumps back up to 470 PSI ver=
y quickly.&nbsp;<div>Question is " should I be concerned about the high num=
bers I am experiencing ?</div><div><br clear=3D"none"></div><div>THANKS for=
 your input</div><div><br clear=3D"none"></div><div>Dave</div></div>
_______________________________________________<br clear=3D"none">
 rel=3D"nofollow" target=3D"_blank">http://www.team.net/donate.html</a><br =
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From: Bob Spidell <[email-masked]>
Date: Thu, 10 Aug 2023 06:43:22 -0700

This is a multi-part message in MIME format.
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On a side note: Someone commented that the higher pressures reported may 
have been caused by the owner using the O-ring style accumulator pistons 
as opposed to the 'traditional' metal rings style. Though I think the 
O-rings are a good idea--I would have used them if I'd known/thought 
about them--I don't think that alone would necessarily account for 
higher pressures. Accumulator pressure is limited by relief holes in the 
bore; when the piston is pushed far enough back, the holes are exposed 
and allow fluid to flow out of the accumulator (the piston both builds 
pressure and regulates it). The metal ring type pistons--they look like 
small engine pistons--should develop the spec'd pressure; but the 
O-rings would be less likely to score the bore and cause pressure loss 
over time. Or, are the metal ring type that leaky? Two things could 
cause higher-than-spec pressure: 1) much stronger accumulator spring(s) 
or 2) an inaccurate gauge. The oil pressure gauge on my BJ8 registered 
zero PSI for many years--obviously, it had SOME pressure--but my car 
miraculously gained 20PSI at idle when I had the gauge rebuilt and 
adjusted to a standard (i.e. 'calibrated').

On another note; just caught an episode of Wheeler Dealers where Elvis 
fixed an inop O/D on a Triumph Dolomite Sprint (I had never heard of the 
car before but, of course, 'Dolomite' has Healey history). The O/D 
appeared to be a Laycock, but the offending part--the solenoid, 
natch--was a more robust-appearing unit mounted horizontally on the 
bottom of the O/D. Anyone know anything about what, presumably, is a 
later Laycock unit?

On 8/9/2023 11:39 AM, warthodson--- via Healeys wrote:
> Dave, I found this in my Spam file. Surely someone has an opinion 
> concerning the 500-550 psi!
> Gary Hodson
>
> On Wednesday, August 9, 2023 at 03:05:56 AM CDT, John and Kerry Rowe 
> <[email-masked]> wrote:
>
>
> On Tue, Aug 8, 2023 at 1:39 PM David Wirken via Healeys 
> <[email-masked]> 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.

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<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  </head>
  <body>
    On a side note: Someone commented that the higher pressures reported
    may have been caused by the owner using the O-ring style accumulator
    pistons as opposed to the 'traditional' metal rings style. Though I
    think the O-rings are a good idea--I would have used them if I'd
    known/thought about them--I don't think that alone would necessarily
    account for higher pressures. Accumulator pressure is limited by
    relief holes in the bore; when the piston is pushed far enough back,
    the holes are exposed and allow fluid to flow out of the accumulator
    (the piston both builds pressure and regulates it). The metal ring
    type pistons--they look like small engine pistons--should develop
    the spec'd pressure; but the O-rings would be less likely to score
    the bore and cause pressure loss over time. Or, are the metal ring
    type that leaky? Two things could cause higher-than-spec pressure:
    1) much stronger accumulator spring(s) or 2) an inaccurate gauge.
    The oil pressure gauge on my BJ8 registered zero PSI for many
    years--obviously, it had SOME pressure--but my car miraculously
    gained 20PSI at idle when I had the gauge rebuilt and adjusted to a
    standard (i.e. 'calibrated').<br>
    <br>
    On another note; just caught an episode of Wheeler Dealers where
    Elvis fixed an inop O/D on a Triumph Dolomite Sprint (I had never
    heard of the car before but, of course, 'Dolomite' has Healey
    history). The O/D appeared to be a Laycock, but the offending
    part--the solenoid, natch--was a more robust-appearing unit mounted
    horizontally on the bottom of the O/D. Anyone know anything about
    what, presumably, is a later Laycock unit?<br>
    <br>
    <br>
    <div class="moz-cite-prefix">On 8/9/2023 11:39 AM, warthodson--- via
      Healeys wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:[email-masked]">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <div class="ydpf9d02591yahoo-style-wrap" style="font-family:Comic
        Sans MS, sans-serif;font-size:16px;">
        <div dir="ltr" data-setdir="false">Dave, I found this in my Spam
          file. Surely someone has an opinion concerning the 500-550
          psi!</div>
        <div dir="ltr" data-setdir="false">Gary Hodson </div>
        <div><br>
        </div>
      </div>
      <div id="ydpe0c6e4beyahoo_quoted_1632753241"
        class="ydpe0c6e4beyahoo_quoted">
        <div style="font-family:'Helvetica Neue', Helvetica, Arial,
          sans-serif;font-size:13px;color:#26282a;">
          <div> On Wednesday, August 9, 2023 at 03:05:56 AM CDT, John
            and Kerry Rowe <a class="moz-txt-link-rfc2396E" href="mailto:[email-masked]">&lt;[email-masked]&gt;</a> wrote: </div>
          <div><br>
          </div>
          <div><br>
          </div>
          <div>
            <div id="ydpe0c6e4beyiv9562235249">
              <div>
                <div dir="ltr">I would be very happy with those
                  pressures. I wish!</div>
                <br clear="none">
                <div class="ydpe0c6e4beyiv9562235249gmail_quote">
                  <div id="ydpe0c6e4beyiv9562235249yqt70578"
                    class="ydpe0c6e4beyiv9562235249yqt4883648648">
                    <div dir="ltr"
                      class="ydpe0c6e4beyiv9562235249gmail_attr">On Tue,
                      Aug 8, 2023 at 1:39 PM David Wirken via Healeys
                      &lt;<a shape="rect"
                        href="mailto:[email-masked]"
                        rel="nofollow" target="_blank"
                        moz-do-not-send="true"
                        class="moz-txt-link-freetext">[email-masked]</a>&gt;
                      wrote:<br clear="none">
                    </div>
                    <blockquote style="margin:0px 0px 0px
                      0.8ex;border-left:1px solid
                      rgb(204,204,204);padding-left:1ex;"
                      class="ydpe0c6e4beyiv9562235249gmail_quote">
                      <div dir="ltr">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. 
                        <div>Question is " should I be concerned about
                          the high numbers I am experiencing ?</div>
                        <div><br clear="none">
                        </div>
                        <div>THANKS for your input</div>
                        <div><br clear="none">
                        </div>
                        <div>Dave</div>
                      </div>
                      <br>
                    </blockquote>
                  </div>
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>
    </blockquote>
    <br>
  </body>
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[email-masked]

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From: Roger Grace <[email-masked]>
Date: Thu, 10 Aug 2023 16:21:38 -0700

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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 <[email-masked]>
Date: Mon., Aug. 7, 2023, 8:43 p.m.
Subject: Re: [Healeys] Overdrive pressures
To: David Wirken <[email-masked]>

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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t
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>
>

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<div dir=3D"auto"><div>Sorry I neglected to copy the list.</div><div dir=3D=
"auto">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 styl=
e 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.<=
/div><div dir=3D"auto">rg</div><div dir=3D"auto"><br><div class=3D"gmail_qu=
ote" dir=3D"auto"><div dir=3D"ltr" class=3D"gmail_attr">---------- Forwarde=
d message ---------<br>From: <strong class=3D"gmail_sendername" dir=3D"auto=
">Roger Grace</strong> <span dir=3D"auto">&lt;<a href=3D"mailto:roggrace@te=
lus.net">[email-masked]</a>&gt;</span><br>Date: Mon., Aug. 7, 2023, 8:4=
3 p.m.<br>Subject: Re: [Healeys] Overdrive pressures<br>To: David Wirken &l=
t;<a href=3D"mailto:[email-masked]">[email-masked]</a>&gt;<br></d=
iv><br><br><div dir=3D"ltr"><div>No !</div><div>Suspect that your replaceme=
nt piston uses an O ring instead of the old sleeve rings. That, together wi=
th a new spring usually ups the pressure. Is it engaging too quickly with a=
 jolt ?<br></div><div>rg<br></div></div><div id=3D"m_5857095237910007045DAB=
4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br><table style=3D"border-top:1px solid=
 #d3d4de"><tbody><tr><td style=3D"width:55px;padding-top:13px"><a href=3D"h=
ttp://www.avg.com/email-signature?utm_medium=3Demail&amp;utm_source=3Dlink&=
amp;utm_campaign=3Dsig-email&amp;utm_content=3Dwebmail" target=3D"_blank" r=
el=3D"noreferrer"><img src=3D"https://s-install.avcdn.net/ipm/preview/icons=
/icon-envelope-tick-green-avg-v1.png" alt=3D"" width=3D"46" height=3D"29" s=
tyle=3D"width:46px;height:29px"></a></td><td style=3D"width:470px;padding-t=
op:12px;color:#41424e;font-size:13px;font-family:Arial,Helvetica,sans-serif=
;line-height:18px">Virus-free.<a href=3D"http://www.avg.com/email-signature=
?utm_medium=3Demail&amp;utm_source=3Dlink&amp;utm_campaign=3Dsig-email&amp;=
utm_content=3Dwebmail" style=3D"color:#4453ea" target=3D"_blank" rel=3D"nor=
eferrer">www.avg.com</a></td></tr></tbody></table><a href=3D"#m_58570952379=
10007045_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2" width=3D"1" height=3D"1" rel=
=3D"noreferrer"></a></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" c=
lass=3D"gmail_attr">On Mon, Aug 7, 2023 at 8:37=E2=80=AFPM David Wirken via=
 Healeys &lt;<a href=3D"mailto:[email-masked]" target=3D"_blank" re=
l=3D"noreferrer">[email-masked]</a>&gt; wrote:<br></div><blockquote=
 class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px so=
lid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr">Recently=C2=A0overh=
auled 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=C2=A0about 80 PSI when=
 engaged or disengaged and jumps back up to 470 PSI very quickly.=C2=A0<div=
>Question is &quot; should I be concerned about the high numbers I am exper=
iencing ?</div><div><br></div><div>THANKS for your input</div><div><br></di=
v><div>Dave</div></div>
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