healeys
[Top] [All Lists]

Re: [Healeys] Overdrive pressure not releasing.

To: Bob Spidell <bspidell@comcast.net>
Subject: Re: [Healeys] Overdrive pressure not releasing.
From: Michael Salter via Healeys <healeys@autox.team.net>
Date: Mon, 18 Apr 2022 11:43:45 -0400
Cc: Healeys <healeys@autox.team.net>
Delivered-to: mharc@autox.team.net
Delivered-to: healeys@autox.team.net
References: <000a01d851b6$20733af0$6159b0d0$@alexarevel.plus.com> <CAB3i7LK3kuvn6iBp696_bShjF--APkBQX+07eBNBmsRQDptW8A@mail.gmail.com> <5aba3e49-649e-50c5-9c6d-547ea1f0fbd8@comcast.net> <CAB3i7LJxomfqn1w=1h5N9nbiXRVnY9babKt__E4FveBt+N0QYQ@mail.gmail.com> <53bf49c1-4be7-060e-9002-0ea39f2e9194@comcast.net> <002b01d852a9$6d6c62c0$48452840$@alexarevel.plus.com> <CALPtYiPAuYYR-hfN-O=EQ9jw7ZZoVJNJnhkNAX8MiSzgsuf+_Q@mail.gmail.com> <57b2de09-40c1-9f95-b4e9-55b287c5722f@comcast.net>
--===============4308429052223411828==

--000000000000d12b1e05dcefa0bc
Content-Transfer-Encoding: quoted-printable

*Wouldn't opening up an O/D with 500psi be kind of messy? *
Lots of pressure but actually very little volume of oil involved.

M

On Mon, Apr 18, 2022 at 11:25 AM Bob Spidell <bspidell@comcast.net> wrote:

> Wouldn't opening up an O/D with 500psi be kind of messy?
>
> On 4/18/2022 8:03 AM, Roger Grace wrote:
>
> To confirm Michae's analysis, consider:
>   remove ball, spring and plunger
>   remove the valve push rod and inspect - I use a piece of steel wire of
> appropriate thickness to pry out.
>   replace the push rod - it should go in smoothly
>   insert the wire again and push down gently; with your other hand operat=
e
> the cam and you should feel the operating rod move up and down on the cam=
.
>  if not MS is correct and the pin/peg has failed....
>  of course it could also be the cotter pin that goes through the setting
> lever - but less likely IMO
> BTW I have found that my OD (O rings) holds 400 psi for several days.
> rg
>
>
>
>
> <http://www.avg.com/email-signature?utm_medium=3Demail&utm_source=3Dlink&=
utm_campaign=3Dsig-email&utm_content=3Dwebmail> Virus-free.
> www.avg.com
> <http://www.avg.com/email-signature?utm_medium=3Demail&utm_source=3Dlink&=
utm_campaign=3Dsig-email&utm_content=3Dwebmail>
>
> On Sun, Apr 17, 2022 at 3:21 PM Simon Lachlan via Healeys <
> healeys@autox.team.net> wrote:
>
>> That=E2=80=99s the one I=E2=80=99ve got. I did get an increase in pressu=
re. No question
>> about that.
>>
>> I talked to Dave at OD Spares with regard to the various accumulators ou=
t
>> there at the moment. I don=E2=80=99t recall exactly but he supplies all =
of them to
>> his customers and, I think, to the suppliers.
>>
>> Simon
>>
>>
>>
>> *From:* Healeys <healeys-bounces@autox.team.net> *On Behalf Of *Bob
>> Spidell
>> *Sent:* 17 April 2022 23:06
>> *To:* Michael Salter <michaelsalter@gmail.com>
>> *Cc:* healeys@autox.team.net
>> *Subject:* Re: [Healeys] Overdrive pressure not releasing.
>>
>>
>>
>> AH Spares has an accumulator and piston which uses an O-ring. It appears
>> the pressure relief hole is chamfered:
>>
>>
>> https://www.ahspares.co.uk/austin-healey/performance-parts/gearbox-overd=
rive/o-ring-conversion-accumulator-piston.aspx
>>
>> On 4/17/2022 12:03 PM, Michael Salter wrote:
>>
>> Actually Bob I've never used an  "O" ringed accumulator.
>>
>> I spent a little time many years back looking into using "O" rings on th=
e
>> accumulator but couldn't resolve the issue of the ring being chaffed whe=
n
>> passing over the radial drillings in the accumulator body.
>>
>> Does anyone know how that has been solved?
>>
>>
>>
>> M
>>
>>
>>
>> On Sun., Apr. 17, 2022, 2:49 p.m. Bob Spidell, <bspidell@comcast.net>
>> wrote:
>>
>> Michael,
>>
>> Sounds like you're implying the O-ringed accumulator is superior to the
>> metal ring (OEM) type? Wish I'd known about it when I rebuilt my O/D (I
>> bought the DWM 'uprated' accumulator).
>>
>> I'll throw out another, very unlikely, potential cause: the cone clutch
>> could be stuck together. I've heard of this happening, but have never
>> experienced it my self--nor has anyone I know--but it's theoretically
>> possible (esp. if the clutch is excessively worn). Could this be the rea=
son
>> the manual is adamant about replacing the 8 strong springs, of two lengt=
hs,
>> that oppose the operating pistons on overhaul, regardless if they still
>> seem robust?
>>
>> On 4/17/2022 9:31 AM, Michael Salter via Healeys wrote:
>>
>> Simon,
>>
>> Based upon your synopsis I conclude that the operating valve is NOT
>> opening when either the solenoid lever or the setting lever is being mov=
ed
>> to the position where the operating valve ball would normally be lifted =
off
>> its seat.
>>
>> This conclusion is based upon your discovery that the pressure in the
>> accumulator, as indicated on the gauge, does not leak away overnight.
>>
>> There is a small clearance between the operating valve push rod and the
>> overdrive housing. If the operating valve ball was indeed lifted off its
>> seat all the oil in the accumulator would, over time, leak past the
>> operating rod thus discharge the accumulator.
>>
>> This process would indeed take some time but would certainly completely
>> relieve most, if not all the residual accumulator pressure overnight.
>>
>> If however the operating valve ball is still in contact with its seat
>> (i.e. not being lifted) the oil pressure would not reach the small
>> clearance between the valve push rod and the housing and, other than pas=
t
>> the accumulator rings there is nowhere for that pressure to be relieved.
>>
>> I would presume that Overdrive Spares installed an accumulator with an
>> "O" ring rather than the original cast iron rings. If the original type
>> accumulator piston was still fitted, oil would seep past the cast iron
>> rings to relieve the pressure, albeit very slowly, and again the
>> accumulator pressure would be discharged overnight..
>>
>> The cam on the operating shaft, the one which lifts the operating valve
>> push rod and thus the operating valve ball, is locked to the shaft with =
a
>> small taper pin. I would guess that the taper pin has either fallen out =
or
>> sheared.
>>
>> Bad news is that this pin cannot be accessed without removing and
>> disassembling the overdrive.
>>
>>
>>
>> M
>>
>>
>>
>> On Sat, Apr 16, 2022 at 1:19 PM Simon Lachlan via Healeys <
>> healeys@autox.team.net> wrote:
>>
>> My OD is driving me mad and I definitely need some inspired advice. A bi=
t
>> of background first. I=E2=80=99ll try to lay out all the facts in a logi=
cal
>> sequence. (I=E2=80=99m increasingly reluctant to link ODs with logic!)
>>
>>    1. I=E2=80=99d say that the OD has done +/- 15k miles since a total r=
ebuild
>>    by Overdrive Spares here in UK.
>>    2. The OD had issues before Christmas (21) and was sorted out by OD
>>    Spares. The accumulator was uprated and pressure issues sorted.
>>    3. OD functioned 100% on the few times I=E2=80=99d been able to take =
it out
>>    since then until..
>>    4. One day, the OD stopped functioning.
>>    5. I checked the electrics. All fine there so I delved a bit deeper.
>>    6. It had fried its solenoid which I replaced. But=E2=80=A6
>>    7. That did not fix the problem so=E2=80=A6
>>    8. I decided that the operating valve=E2=80=99s adjustment might be o=
ff so..
>>    9. I bought a dial gauge and hoped to sort it out precisely rather
>>    than by =E2=80=9Cfeel=E2=80=9D, which I lack in this area.
>>    10. Prior to using the gauge I decided to see if the OD was
>>    functioning at all so I raised the car on stands and fitted my pressu=
re
>>    gauge.
>>    11. I get a reading of 500psi rising a bit when I rev the engine but
>>    I=E2=80=99d suppose that would drop when the oil warms up.
>>    12. BUT, and this is where things go pear-shaped=E2=80=A6moving the l=
ittle
>>    lever on the RHS up and down does not engage/disengage OD. There is n=
o
>>    change on the gauge to show OD engaging or disengaging.
>>    13. AND, the gauge stays at 500psi even when the engine is off.
>>    Moving the lever 20 times has zero effect. Stayed at 500 overnight!
>>    14. Of course, I checked for dirt in the operating valve area. None.
>>    15. Likewise, the tiny hole in the =E2=80=9Cvalve =E2=80=93 operating=
=E2=80=9D (the spindle
>>    thing which the ball sits on)=E2=80=A6.that=E2=80=99s clear. And sure=
ly, the pressure would
>>    diminish overnight if something in that area was partially obstructed=
?
>>    16. When I remove the pressure valve, there=E2=80=99s a small spillag=
e =E2=80=93 no
>>    more than you=E2=80=99d expect =E2=80=93 but repeating the pressure g=
auge process only
>>    returns the same results.
>>    17. I see in the bible according to Norman Nock that =E2=80=9CHolding=
 this
>>    lever with your thumb and index finger, you should be able to push th=
e
>>    lever down lightly about =E2=85=9C=E2=80=9D until you feel a slight s=
pring pressure
>>    resistance. The lever should go down another =C2=BC=E2=80=9D after en=
countering the
>>    resistance=E2=80=A6=E2=80=A6=E2=80=9D ie there=E2=80=99s about =E2=85=
=9D=E2=80=9D movement up & down in that lever. Well,
>>    my lever does move and does lift the ball, but there=E2=80=99s not =
=E2=85=9D=E2=80=9D movement
>>    there. Could that be the problem area???
>>    18. Almost finished=E2=80=A6keep reading!
>>
>> So, I=E2=80=99m stumped. Every time I learn something new about the OD, =
it has a
>> new trick to baffle me.
>>
>> I=E2=80=99ve no 100% sure way of telling whether it=E2=80=99s gone into =
OD  and stuck
>> there or whether it=E2=80=99s simply not going into OD at all.
>>
>> I=E2=80=99ve done a lot of reading through my books and collection of ad=
vice from
>> the various gurus and found reference to ODs being stuck but those seeme=
d
>> to be to do with =E2=80=9Cweak springs=E2=80=9D which, particularly afte=
r a long lay-off,
>> wouldn=E2=80=99t disengage. The cure for this being a good smack on the =
steel plate
>> sandwiched in the OD from below. Well, that seems to be a stuck mechanis=
m
>> issue whereas I=E2=80=99m facing a hydraulic conundrum. Or am I?
>>
>> There is what is usually referred to as the =E2=80=9Cpressure relief val=
ve=E2=80=9D
>> adjacent to the accumulator. The name suggested that pressure might be
>> stuck in that area=E2=80=A6.but surely not overnight?
>>
>>
>>
>> Any ideas? I am particularly reluctant to take the gearbox and OD out.
>> You=E2=80=99ll recall the ridiculous business of the defective clutch ki=
t? Well, I
>> forget whether we had the box in and out 3 times or 4. I=E2=80=99d hoped=
 not to do
>> it again so soon or ever for that matter.
>>
>>
>>
>> I=E2=80=99m hoping for a miracle of course but some sound advice would b=
e a
>> godsend=E2=80=A6=E2=80=A6=E2=80=A6=E2=80=A6
>>
>>
>>
>> Thanks,
>>
>> Simon
>>
>>
>

--000000000000d12b1e05dcefa0bc
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,sa=
ns-serif;font-size:small"><br></div><div class=3D"gmail_default" style=3D"f=
ont-family:arial,sans-serif;font-size:small">
<i>Wouldn&#39;t opening up an O/D with 500psi be kind of messy?

</i></div><div class=3D"gmail_default" style=3D"font-family:arial,sans-seri=
f;font-size:small">Lots of pressure but actually very little volume of oil =
involved.</div><div class=3D"gmail_default" style=3D"font-family:arial,sans=
-serif;font-size:small"><br></div><div class=3D"gmail_default" style=3D"fon=
t-family:arial,sans-serif;font-size:small">M<br></div></div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Apr 18, 2022=
 at 11:25 AM Bob Spidell &lt;<a href=3D"mailto:bspidell@comcast.net";>bspide=
ll@comcast.net</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" st=
yle=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padd=
ing-left:1ex">
 =20
   =20
 =20
  <div>
    Wouldn&#39;t opening up an O/D with 500psi be kind of messy?<br>
    <br>
    <div>On 4/18/2022 8:03 AM, Roger Grace
      wrote:<br>
    </div>
    <blockquote type=3D"cite">
     =20
      <div dir=3D"ltr">
        <div>To confirm Michae&#39;s analysis, consider:</div>
        <div>=C2=A0 remove ball, spring and plunger<br>
        </div>
        <div>=C2=A0 remove the valve push rod and inspect - I use a piece o=
f
          steel wire of appropriate thickness to pry out.<br>
        </div>
        <div>=C2=A0 replace the push rod - it should go in smoothly<br>
        </div>
        <div>=C2=A0 insert the wire again and push down gently; with your
          other hand operate the cam and you should feel the operating
          rod move up and down on the cam.<br>
        </div>
        <div>=C2=A0if not MS is correct and the pin/peg has failed....</div=
>
        <div>=C2=A0of course it could also be the cotter pin that goes
          through the setting lever - but less likely IMO<br>
        </div>
        <div>BTW I have found that my OD (O rings) holds 400 psi for
          several days.</div>
        <div>rg<br>
        </div>
        <div><br>
        </div>
        <div><br>
        </div>
      </div>
      <div id=3D"gmail-m_4226485250876840692DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F=
9FDF2"><br>
        <table style=3D"border-top:1px solid rgb(211,212,222)">
          <tbody>
            <tr>
              <td style=3D"width:55px;padding-top:13px"><a href=3D"http://w=
ww.avg.com/email-signature?utm_medium=3Demail&amp;utm_source=3Dlink&amp;utm=
_campaign=3Dsig-email&amp;utm_content=3Dwebmail" target=3D"_blank"><img src=
=3D"https://ipmcdn.avast.com/images/icons/icon-envelope-tick-green-avg-v1.p=
ng" alt=3D"" style=3D"width: 46px; height: 29px;" width=3D"46" height=3D"29=
"></a></td>
              <td style=3D"width:470px;padding-top:12px;color:rgb(65,66,78)=
;font-size:13px;font-family:Arial,Helvetica,sans-serif;line-height:18px">Vi=
rus-free.
                <a href=3D"http://www.avg.com/email-signature?utm_medium=3D=
email&amp;utm_source=3Dlink&amp;utm_campaign=3Dsig-email&amp;utm_content=3D=
webmail" style=3D"color:rgb(68,83,234)" target=3D"_blank">www.avg.com</a> <=
/td>
            </tr>
          </tbody>
        </table>
      </div>
      <br>
      <div class=3D"gmail_quote">
        <div dir=3D"ltr" class=3D"gmail_attr">On Sun, Apr 17, 2022 at 3:21
          PM Simon Lachlan via Healeys &lt;<a href=3D"mailto:healeys@autox.=
team.net" target=3D"_blank">healeys@autox.team.net</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 lang=3D"EN-GB">
            <div>
              <p class=3D"MsoNormal"><span>That=E2=80=99s the one I=E2=80=
=99ve got. I did
                  get an increase in pressure. No question about that.</spa=
n></p>
              <p class=3D"MsoNormal"><span>I talked to Dave at OD Spares
                  with regard to the various accumulators out there at
                  the moment. I don=E2=80=99t recall exactly but he supplie=
s all
                  of them to his customers and, I think, to the
                  suppliers.</span></p>
              <p class=3D"MsoNormal"><span>Simon</span></p>
              <p class=3D"MsoNormal"><span>=C2=A0</span></p>
              <div>
                <div style=3D"border-color:rgb(225,225,225) currentcolor cu=
rrentcolor;border-style:solid none none;border-width:1pt medium medium;padd=
ing:3pt 0cm 0cm">
                  <p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</spa=
n></b><span lang=3D"EN-US"> Healeys &lt;<a href=3D"mailto:healeys-bounces@a=
utox.team.net" target=3D"_blank">healeys-bounces@autox.team.net</a>&gt;
                      <b>On Behalf Of </b>Bob Spidell<br>
                      <b>Sent:</b> 17 April 2022 23:06<br>
                      <b>To:</b> Michael Salter &lt;<a href=3D"mailto:micha=
elsalter@gmail.com" target=3D"_blank">michaelsalter@gmail.com</a>&gt;<br>
                      <b>Cc:</b> <a href=3D"mailto:healeys@autox.team.net"; =
target=3D"_blank">healeys@autox.team.net</a><br>
                      <b>Subject:</b> Re: [Healeys] Overdrive pressure
                      not releasing.</span></p>
                </div>
              </div>
              <p class=3D"MsoNormal">=C2=A0</p>
              <p class=3D"MsoNormal" style=3D"margin-bottom:12pt">AH Spares
                has an accumulator and piston which uses an O-ring. It
                appears the pressure relief hole is chamfered:<br>
                <br>
                <a href=3D"https://www.ahspares.co.uk/austin-healey/perform=
ance-parts/gearbox-overdrive/o-ring-conversion-accumulator-piston.aspx" tar=
get=3D"_blank">https://www.ahspares.co.uk/austin-healey/performance-parts/g=
earbox-overdrive/o-ring-conversion-accumulator-piston.aspx</a><br>
                <br>
              </p>
              <div>
                <p class=3D"MsoNormal">On 4/17/2022 12:03 PM, Michael
                  Salter wrote:</p>
              </div>
              <blockquote style=3D"margin-top:5pt;margin-bottom:5pt">
                <div>
                  <p class=3D"MsoNormal">Actually Bob I&#39;ve never used a=
n=C2=A0
                    &quot;O&quot; ringed accumulator.=C2=A0 </p>
                  <div>
                    <p class=3D"MsoNormal">I spent a little time many
                      years back looking into using &quot;O&quot; rings on =
the
                      accumulator but couldn&#39;t resolve the issue of the
                      ring being chaffed when passing over the radial
                      drillings in the accumulator body.=C2=A0</p>
                  </div>
                  <div>
                    <p class=3D"MsoNormal">Does anyone know how that has
                      been solved?</p>
                  </div>
                  <div>
                    <p class=3D"MsoNormal">=C2=A0</p>
                  </div>
                  <div>
                    <p class=3D"MsoNormal">M</p>
                  </div>
                </div>
                <p class=3D"MsoNormal">=C2=A0</p>
                <div>
                  <div>
                    <p class=3D"MsoNormal">On Sun., Apr. 17, 2022, 2:49
                      p.m. Bob Spidell, &lt;<a href=3D"mailto:bspidell@comc=
ast.net" target=3D"_blank">bspidell@comcast.net</a>&gt;
                      wrote:</p>
                  </div>
                  <blockquote style=3D"border-color:currentcolor currentcol=
or currentcolor rgb(204,204,204);border-style:none none none solid;border-w=
idth:medium medium medium 1pt;padding:0cm 0cm 0cm 6pt;margin-left:4.8pt;mar=
gin-right:0cm">
                    <div>
                      <p class=3D"MsoNormal" style=3D"margin-bottom:12pt">M=
ichael,
                        <br>
                        <br>
                        Sounds like you&#39;re implying the O-ringed
                        accumulator is superior to the metal ring (OEM)
                        type? Wish I&#39;d known about it when I rebuilt my
                        O/D (I bought the DWM &#39;uprated&#39; accumulator=
).<br>
                        <br>
                        I&#39;ll throw out another, very unlikely, potentia=
l
                        cause: the cone clutch could be stuck together.
                        I&#39;ve heard of this happening, but have never
                        experienced it my self--nor has anyone I
                        know--but it&#39;s theoretically possible (esp. if
                        the clutch is excessively worn). Could this be
                        the reason the manual is adamant about replacing
                        the 8 strong springs, of two lengths, that
                        oppose the operating pistons on overhaul,
                        regardless if they still seem robust?<br>
                        <br>
                      </p>
                      <div>
                        <p class=3D"MsoNormal">On 4/17/2022 9:31 AM,
                          Michael Salter via Healeys wrote:</p>
                      </div>
                      <blockquote style=3D"margin-top:5pt;margin-bottom:5pt=
">
                        <div>
                          <div>
                            <p class=3D"MsoNormal"><span style=3D"font-size=
:12pt;font-family:&quot;Arial&quot;,sans-serif">Simon,</span></p>
                          </div>
                          <div>
                            <p class=3D"MsoNormal"><span style=3D"font-size=
:12pt;font-family:&quot;Arial&quot;,sans-serif">Based
                                upon your synopsis I conclude that the
                                operating valve is NOT opening when
                                either the solenoid lever or the setting
                                lever is being moved to the position
                                where the operating valve ball would
                                normally be lifted off its seat.</span></p>
                          </div>
                          <div>
                            <p class=3D"MsoNormal"><span style=3D"font-size=
:12pt;font-family:&quot;Arial&quot;,sans-serif">This
                                conclusion is based upon your discovery
                                that the pressure in the accumulator, as
                                indicated on the gauge, does not leak
                                away overnight.</span></p>
                          </div>
                          <div>
                            <p class=3D"MsoNormal"><span style=3D"font-size=
:12pt;font-family:&quot;Arial&quot;,sans-serif">There
                                is a small clearance between the
                                operating valve push rod and the
                                overdrive housing. If the operating
                                valve ball was indeed lifted off its
                                seat all the oil in the accumulator
                                would, over time, leak past the
                                operating rod thus discharge the
                                accumulator. </span></p>
                          </div>
                          <div>
                            <p class=3D"MsoNormal"><span style=3D"font-size=
:12pt;font-family:&quot;Arial&quot;,sans-serif">This
                                process would indeed take some time but
                                would certainly completely relieve most,
                                if not all the residual accumulator
                                pressure overnight.</span></p>
                          </div>
                          <div>
                            <p class=3D"MsoNormal"><span style=3D"font-size=
:12pt;font-family:&quot;Arial&quot;,sans-serif">If
                                however the operating valve ball is
                                still in contact with its seat (i.e. not
                                being lifted) the oil pressure would not
                                reach the small clearance between the
                                valve push rod and the housing and,
                                other than past the accumulator rings
                                there is nowhere for that pressure to be
                                relieved. </span></p>
                          </div>
                          <div>
                            <p class=3D"MsoNormal"><span style=3D"font-size=
:12pt;font-family:&quot;Arial&quot;,sans-serif">I
                                would presume that Overdrive Spares
                                installed an accumulator with an &quot;O&qu=
ot;
                                ring rather than the original cast iron
                                rings. If the original type accumulator
                                piston was still fitted, oil would seep
                                past the cast iron rings to relieve the
                                pressure, albeit very slowly, and again
                                the accumulator pressure would be
                                discharged overnight..</span></p>
                          </div>
                          <div>
                            <p class=3D"MsoNormal"><span style=3D"font-size=
:12pt;font-family:&quot;Arial&quot;,sans-serif">The
                                cam on the operating shaft, the one
                                which lifts the operating valve push rod
                                and thus the operating valve ball, is
                                locked to the shaft with a small taper
                                pin. I would guess that the taper pin
                                has either fallen out or sheared. </span></=
p>
                          </div>
                          <div>
                            <p class=3D"MsoNormal"><span style=3D"font-size=
:12pt;font-family:&quot;Arial&quot;,sans-serif">Bad
                                news is that this pin cannot be accessed
                                without removing and disassembling the
                                overdrive.</span></p>
                          </div>
                          <div>
                            <p class=3D"MsoNormal"><span style=3D"font-size=
:12pt;font-family:&quot;Arial&quot;,sans-serif">=C2=A0</span></p>
                          </div>
                          <div>
                            <p class=3D"MsoNormal"><span style=3D"font-size=
:12pt;font-family:&quot;Arial&quot;,sans-serif">M</span></p>
                          </div>
                        </div>
                        <p class=3D"MsoNormal">=C2=A0</p>
                        <div>
                          <div>
                            <p class=3D"MsoNormal">On Sat, Apr 16, 2022 at
                              1:19 PM Simon Lachlan via Healeys &lt;<a href=
=3D"mailto:healeys@autox.team.net"; target=3D"_blank">healeys@autox.team.net=
</a>&gt;
                              wrote:</p>
                          </div>
                          <blockquote style=3D"border-color:currentcolor cu=
rrentcolor currentcolor rgb(204,204,204);border-style:none none none solid;=
border-width:medium medium medium 1pt;padding:0cm 0cm 0cm 6pt;margin-left:4=
.8pt;margin-right:0cm">
                            <div>
                              <div>
                                <p class=3D"MsoNormal">My OD is driving me
                                  mad and I definitely need some
                                  inspired advice. A bit of background
                                  first. I=E2=80=99ll try to lay out all th=
e
                                  facts in a logical sequence. (I=E2=80=99m
                                  increasingly reluctant to link ODs
                                  with logic!)</p>
                                <ol type=3D"1" start=3D"1">
                                  <li class=3D"MsoNormal">I=E2=80=99d say t=
hat the
                                    OD has done +/- 15k miles since a
                                    total rebuild by Overdrive Spares
                                    here in UK.</li>
                                  <li class=3D"MsoNormal">The OD had
                                    issues before Christmas (21) and was
                                    sorted out by OD Spares. The
                                    accumulator was uprated and pressure
                                    issues sorted.</li>
                                  <li class=3D"MsoNormal">OD functioned
                                    100% on the few times I=E2=80=99d been =
able
                                    to take it out since then until..</li>
                                  <li class=3D"MsoNormal">One day, the OD
                                    stopped functioning.</li>
                                  <li class=3D"MsoNormal">I checked the
                                    electrics. All fine there so I
                                    delved a bit deeper.</li>
                                  <li class=3D"MsoNormal">It had fried its
                                    solenoid which I replaced. But=E2=80=A6=
</li>
                                  <li class=3D"MsoNormal">That did not fix
                                    the problem so=E2=80=A6</li>
                                  <li class=3D"MsoNormal">I decided that
                                    the operating valve=E2=80=99s adjustmen=
t
                                    might be off so..</li>
                                  <li class=3D"MsoNormal">I bought a dial
                                    gauge and hoped to sort it out
                                    precisely rather than by =E2=80=9Cfeel=
=E2=80=9D,
                                    which I lack in this area.</li>
                                  <li class=3D"MsoNormal">Prior to using
                                    the gauge I decided to see if the OD
                                    was functioning at all so I raised
                                    the car on stands and fitted my
                                    pressure gauge.</li>
                                  <li class=3D"MsoNormal">I get a reading
                                    of 500psi rising a bit when I rev
                                    the engine but I=E2=80=99d suppose that
                                    would drop when the oil warms up.</li>
                                  <li class=3D"MsoNormal">BUT, and this is
                                    where things go pear-shaped=E2=80=A6mov=
ing
                                    the little lever on the RHS up and
                                    down does not engage/disengage OD.
                                    There is no change on the gauge to
                                    show OD engaging or disengaging.</li>
                                  <li class=3D"MsoNormal">AND, the gauge
                                    stays at 500psi even when the engine
                                    is off. Moving the lever 20 times
                                    has zero effect. Stayed at 500
                                    overnight!</li>
                                  <li class=3D"MsoNormal">Of course, I
                                    checked for dirt in the operating
                                    valve area. None.</li>
                                  <li class=3D"MsoNormal">Likewise, the
                                    tiny hole in the =E2=80=9Cvalve =E2=80=
=93 operating=E2=80=9D
                                    (the spindle thing which the ball
                                    sits on)=E2=80=A6.that=E2=80=99s clear.=
 And surely,
                                    the pressure would diminish
                                    overnight if something in that area
                                    was partially obstructed?</li>
                                  <li class=3D"MsoNormal">When I remove
                                    the pressure valve, there=E2=80=99s a s=
mall
                                    spillage =E2=80=93 no more than you=E2=
=80=99d expect
                                    =E2=80=93 but repeating the pressure ga=
uge
                                    process only returns the same
                                    results.</li>
                                  <li class=3D"MsoNormal">I see in the
                                    bible according to Norman Nock that
                                    =E2=80=9CHolding this lever with your t=
humb
                                    and index finger, you should be able
                                    to push the lever down lightly about
                                    =E2=85=9C=E2=80=9D until you feel a sli=
ght spring
                                    pressure resistance. The lever
                                    should go down another =C2=BC=E2=80=9D =
after
                                    encountering the resistance=E2=80=A6=E2=
=80=A6=E2=80=9D ie
                                    there=E2=80=99s about =E2=85=9D=E2=80=
=9D movement up &amp;
                                    down in that lever. Well, my lever
                                    does move and does lift the ball,
                                    but there=E2=80=99s not =E2=85=9D=E2=80=
=9D movement there.
                                    Could that be the problem area???</li>
                                  <li class=3D"MsoNormal">Almost
                                    finished=E2=80=A6keep reading!</li>
                                </ol>
                                <p class=3D"MsoNormal" style=3D"margin-left=
:18pt">So, I=E2=80=99m
                                  stumped. Every time I learn something
                                  new about the OD, it has a new trick
                                  to baffle me.</p>
                                <p class=3D"MsoNormal" style=3D"margin-left=
:18pt">I=E2=80=99ve no 100%
                                  sure way of telling whether it=E2=80=99s =
gone
                                  into OD =C2=A0and stuck there or whether
                                  it=E2=80=99s simply not going into OD at =
all.</p>
                                <p class=3D"MsoNormal" style=3D"margin-left=
:18pt">I=E2=80=99ve done a
                                  lot of reading through my books and
                                  collection of advice from the various
                                  gurus and found reference to ODs being
                                  stuck but those seemed to be to do
                                  with =E2=80=9Cweak springs=E2=80=9D which=
,
                                  particularly after a long lay-off,
                                  wouldn=E2=80=99t disengage. The cure for =
this
                                  being a good smack on the steel plate
                                  sandwiched in the OD from below. Well,
                                  that seems to be a stuck mechanism
                                  issue whereas I=E2=80=99m facing a hydrau=
lic
                                  conundrum. Or am I?</p>
                                <p class=3D"MsoNormal" style=3D"margin-left=
:18pt">There is what
                                  is usually referred to as the
                                  =E2=80=9Cpressure relief valve=E2=80=9D a=
djacent to
                                  the accumulator. The name suggested
                                  that pressure might be stuck in that
                                  area=E2=80=A6.but surely not overnight?</=
p>
                                <p class=3D"MsoNormal" style=3D"margin-left=
:18pt">=C2=A0</p>
                                <p class=3D"MsoNormal" style=3D"margin-left=
:18pt">Any ideas? I
                                  am particularly reluctant to take the
                                  gearbox and OD out. You=E2=80=99ll recall=
 the
                                  ridiculous business of the defective
                                  clutch kit? Well, I forget whether we
                                  had the box in and out 3 times or 4.
                                  I=E2=80=99d hoped not to do it again so s=
oon
                                  or ever for that matter.</p>
                                <p class=3D"MsoNormal" style=3D"margin-left=
:18pt">=C2=A0</p>
                                <p class=3D"MsoNormal" style=3D"margin-left=
:18pt">I=E2=80=99m hoping
                                  for a miracle of course but some sound
                                  advice would be a godsend=E2=80=A6=E2=80=
=A6=E2=80=A6=E2=80=A6</p>
                                <p class=3D"MsoNormal" style=3D"margin-left=
:18pt">=C2=A0</p>
                                <p class=3D"MsoNormal" style=3D"margin-left=
:18pt">Thanks,</p>
                                <p class=3D"MsoNormal" style=3D"margin-left=
:18pt">Simon</p>
                                <br>
                              </div>
                            </div>
                          </blockquote>
                        </div>
                      </blockquote>
                    </div>
                  </blockquote>
                </div>
              </blockquote>
            </div>
          </div>
        </blockquote>
      </div>
    </blockquote>
    <br>
  </div>

</blockquote></div>

--000000000000d12b1e05dcefa0bc--

--===============4308429052223411828==
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

_______________________________________________

Archive: http://www.team.net/pipermail/healeys 
http://autox.team.net/archive/healeys

Healeys@autox.team.net
http://autox.team.net/mailman/listinfo/healeys



--===============4308429052223411828==--

<Prev in Thread] Current Thread [Next in Thread>