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There is a very small bleed hole in the operating rod that if plugged =
will cause the overdrive pressure to be very slow at releasing.
Remove rod and see if you can blow thru the it. Look in about the middle =
just below the ribs and you will see the bleed hole. It is most likley =
plugged
David Nock
healeydoc@sbcglobal.net
209 948 8767
www.britishcarspecialists.com
Help us have our Founder Norman Nock inducteed into the=20
British Sportscar Hall of Fame, You can vote for your favorites=20
by visiting the site at.
www.britishsportscarhalloffame.org
From: Bob Spidell=20
Sent: Monday, April 18, 2022 8:24 AM
To: Roger Grace ; simon.lachlan@alexarevel.plus.com=20
Cc: Healeys=20
Subject: Re: [Healeys] Overdrive pressure not releasing.
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 =
operate 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
Virus-free. www.avg.com =20
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 =
pressure. No question about that.
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 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-overdr=
ive/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. =20
I spent a little time many years back looking into using "O" rings =
on the accumulator but couldn't resolve the issue of the ring being =
chaffed when passing over the radial drillings in the accumulator body.=20
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,=20
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 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?
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 moved 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.=20
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 past the accumulator rings there is nowhere for that pressure to be =
relieved.=20
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.=20
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 bit of background first. I=E2=80=99ll try to lay out all the =
facts in a logical 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 rebuild by Overdrive Spares here in UK.=20
2.. The OD had issues before Christmas (21) and was sorted =
out by OD Spares. The accumulator was uprated and pressure issues =
sorted.=20
3.. OD functioned 100% on the few times I=E2=80=99d been =
able to take it out since then until..=20
4.. One day, the OD stopped functioning.=20
5.. I checked the electrics. All fine there so I delved a =
bit deeper.=20
6.. It had fried its solenoid which I replaced. =
But=E2=80=A6=20
7.. That did not fix the problem so=E2=80=A6=20
8.. I decided that the operating valve=E2=80=99s =
adjustment might be off so..=20
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.=20
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 =
pressure gauge.=20
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.=20
12.. BUT, and this is where things go =
pear-shaped=E2=80=A6moving 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.=20
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!=20
14.. Of course, I checked for dirt in the operating valve =
area. None.=20
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 surely, the pressure would =
diminish overnight if something in that area was partially obstructed?=20
16.. When I remove the pressure valve, there=E2=80=99s a =
small spillage =E2=80=93 no more than you=E2=80=99d expect =E2=80=93 but =
repeating the pressure gauge process only returns the same results.=20
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 the lever down lightly about =E2=85=9C=E2=80=9D until =
you feel a slight 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 & 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???=20
18.. Almost finished=E2=80=A6keep reading!=20
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 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 hydraulic conundrum. =
Or am I?
There is what is usually referred to as the =
=E2=80=9Cpressure relief valve=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 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 soon or ever for =
that matter.
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
Thanks,
Simon
-------------------------------------------------------------------------=
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<HTML><HEAD>
<META content=3D"text/html; charset=3DUTF-8" =
http-equiv=3DContent-Type></HEAD>
<BODY dir=3Dltr>
<DIV dir=3Dltr>
<DIV style=3D"FONT-SIZE: 12pt; FONT-FAMILY: 'Century'; COLOR: #000000">
<DIV>There is a very small bleed hole in the operating rod that if =
plugged will=20
cause the overdrive pressure to be very slow at releasing.</DIV>
<DIV> </DIV>
<DIV>Remove rod and see if you can blow thru the it. Look in about the =
middle=20
just below the ribs and you will see the bleed hole. It is most likley=20
plugged</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV style=3D"FONT-SIZE: 12pt; FONT-FAMILY: 'Century'; COLOR: =
#000000">David=20
Nock<BR>healeydoc@sbcglobal.net<BR>209 948=20
8767<BR>www.britishcarspecialists.com<BR><BR>Help us have our Founder =
Norman=20
Nock inducteed into the <BR>British Sportscar Hall of Fame, You can vote =
for=20
your favorites <BR>by visiting the site=20
at.<BR>www.britishsportscarhalloffame.org<BR></DIV>
<DIV=20
style=3D'FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: =
"Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; =
DISPLAY: inline'>
<DIV style=3D"FONT: 10pt tahoma">
<DIV> </DIV>
<DIV style=3D"BACKGROUND: #f5f5f5">
<DIV style=3D"font-color: black"><B>From:</B> <A =
title=3Dbspidell@comcast.net>Bob=20
Spidell</A> </DIV>
<DIV><B>Sent:</B> Monday, April 18, 2022 8:24 AM</DIV>
<DIV><B>To:</B> <A title=3Droggrace@telus.net>Roger Grace</A> ; <A=20
title=3Dsimon.lachlan@alexarevel.plus.com>simon.lachlan@alexarevel.plus.c=
om</A>=20
</DIV>
<DIV><B>Cc:</B> <A title=3Dhealeys@autox.team.net>Healeys</A> </DIV>
<DIV><B>Subject:</B> Re: [Healeys] Overdrive pressure not=20
releasing.</DIV></DIV></DIV>
<DIV> </DIV></DIV>
<DIV=20
style=3D'FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: =
"Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; =
DISPLAY: inline'>Wouldn't=20
opening up an O/D with 500psi be kind of messy?<BR><BR>
<DIV class=3Dmoz-cite-prefix>On 4/18/2022 8:03 AM, Roger Grace =
wrote:<BR></DIV>
<BLOCKQUOTE=20
cite=3Dmid:CALPtYiPAuYYR-hfN-O=3DEQ9jw7ZZoVJNJnhkNAX8MiSzgsuf+_Q@mail.gma=
il.com=20
type=3D"cite">
<DIV dir=3Dltr>
<DIV>To confirm Michae's analysis, consider:</DIV>
<DIV> remove ball, spring and plunger<BR></DIV>
<DIV> remove the valve push rod and inspect - I use a piece of =
steel=20
wire of appropriate thickness to pry out.<BR></DIV>
<DIV> replace the push rod - it should go in smoothly<BR></DIV>
<DIV> insert the wire again and push down gently; with your =
other hand=20
operate the cam and you should feel the operating rod move up and down =
on the=20
cam.<BR></DIV>
<DIV>if not MS is correct and the pin/peg has failed....</DIV>
<DIV>of course it could also be the cotter pin that goes through the =
setting=20
lever - but less likely IMO<BR></DIV>
<DIV>BTW I have found that my OD (O rings) holds 400 psi for several=20
days.</DIV>
<DIV>rg<BR></DIV>
<DIV> </DIV>
<DIV> </DIV></DIV>
<DIV id=3DDAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2><BR>
<TABLE style=3D"BORDER-TOP: #d3d4de 1px solid; COLOR: #000000">
<TBODY>
<TR>
<TD style=3D"WIDTH: 55px; PADDING-TOP: 13px"><A=20
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href=3D"http://www.avg.com/email-signature?utm_medium=3Demail&utm_sou=
rce=3Dlink&utm_campaign=3Dsig-email&utm_content=3Dwebmail"=20
target=3D_blank moz-do-not-send=3D"true"><IMG=20
style=3D"HEIGHT: 29px; WIDTH: 46px" alt=3D""=20
=
src=3D"https://ipmcdn.avast.com/images/icons/icon-envelope-tick-green-avg=
-v1.png"=20
width=3D46 height=3D29 moz-do-not-send=3D"true"></A></TD>
<TD=20
style=3D"FONT-SIZE: 13px; FONT-FAMILY: arial,helvetica,sans-serif; =
WIDTH: 470px; COLOR: #41424e; PADDING-TOP: 12px; LINE-HEIGHT: =
18px">Virus-free.=20
<A style=3D"COLOR: #4453ea"=20
=
href=3D"http://www.avg.com/email-signature?utm_medium=3Demail&utm_sou=
rce=3Dlink&utm_campaign=3Dsig-email&utm_content=3Dwebmail"=20
target=3D_blank moz-do-not-send=3D"true">www.avg.com</A>=20
</TD></TR></TBODY></TABLE></DIV>
<DIV> </DIV>
<DIV class=3Dgmail_quote>
<DIV class=3Dgmail_attr dir=3Dltr>On Sun, Apr 17, 2022 at 3:21 PM =
Simon Lachlan=20
via Healeys <<A class=3Dmoz-txt-link-freetext=20
moz-do-not-send=3D"true">healeys@autox.team.net</A>> =
wrote:<BR></DIV>
<BLOCKQUOTE class=3Dgmail_quote=20
style=3D"PADDING-LEFT: 1ex; BORDER-LEFT: rgb(204,204,204) 1px solid; =
MARGIN: 0px 0px 0px 0.8ex">
<DIV lang=3DEN-GB>
<DIV class=3Dgmail-m_246696034598963678WordSection1>
<P class=3DMsoNormal><SPAN>That=E2=80=99s the one I=E2=80=99ve got. =
I did get an increase in=20
pressure. No question about that.</SPAN></P>
<P class=3DMsoNormal><SPAN>I talked to Dave at OD Spares with regard =
to the=20
various accumulators out there at the moment. I don=E2=80=99t recall =
exactly but he=20
supplies all of them to his customers and, I think, to the=20
suppliers.</SPAN></P>
<P class=3DMsoNormal><SPAN>Simon</SPAN></P>
<P class=3DMsoNormal><SPAN></SPAN> </P>
<DIV>
<DIV=20
style=3D"BORDER-TOP: rgb(225,225,225) 1pt solid; BORDER-RIGHT: =
medium none; BORDER-BOTTOM: medium none; PADDING-BOTTOM: 0cm; =
PADDING-TOP: 3pt; PADDING-LEFT: 0cm; BORDER-LEFT: medium none; =
PADDING-RIGHT: 0cm">
<P class=3DMsoNormal><B><SPAN lang=3DEN-US>From:</SPAN></B><SPAN =
lang=3DEN-US>=20
Healeys <<A class=3Dmoz-txt-link-freetext target=3D_blank=20
moz-do-not-send=3D"true">healeys-bounces@autox.team.net</A>> =
<B>On Behalf=20
Of </B>Bob Spidell<BR><B>Sent:</B> 17 April 2022 23:06<BR><B>To:</B> =
Michael=20
Salter <<A class=3Dmoz-txt-link-freetext target=3D_blank=20
=
moz-do-not-send=3D"true">michaelsalter@gmail.com</A>><BR><B>Cc:</B> =
<A=20
class=3Dmoz-txt-link-freetext target=3D_blank=20
=
moz-do-not-send=3D"true">healeys@autox.team.net</A><BR><B>Subject:</B> =
Re:=20
[Healeys] Overdrive pressure not releasing.</SPAN></P></DIV></DIV>
<P class=3DMsoNormal> </P>
<P class=3DMsoNormal style=3D"MARGIN-BOTTOM: 12pt">AH Spares has an =
accumulator=20
and piston which uses an O-ring. It appears the pressure relief hole =
is=20
chamfered:<BR><BR><A class=3Dmoz-txt-link-freetext=20
=
href=3D"https://www.ahspares.co.uk/austin-healey/performance-parts/gearbo=
x-overdrive/o-ring-conversion-accumulator-piston.aspx"=20
target=3D_blank=20
=
moz-do-not-send=3D"true">https://www.ahspares.co.uk/austin-healey/perform=
ance-parts/gearbox-overdrive/o-ring-conversion-accumulator-piston.aspx</A=
><BR><BR></P>
<DIV>
<P class=3DMsoNormal>On 4/17/2022 12:03 PM, Michael Salter =
wrote:</P></DIV>
<BLOCKQUOTE style=3D"MARGIN-BOTTOM: 5pt; MARGIN-TOP: 5pt">
<DIV>
<P class=3DMsoNormal>Actually Bob I've never used an "O" =
ringed=20
accumulator. </P>
<DIV>
<P class=3DMsoNormal>I spent a little time many years back looking =
into=20
using "O" rings on the accumulator but couldn't resolve the issue =
of the=20
ring being chaffed when passing over the radial drillings in the=20
accumulator body. </P></DIV>
<DIV>
<P class=3DMsoNormal>Does anyone know how that has been =
solved?</P></DIV>
<DIV>
<P class=3DMsoNormal> </P></DIV>
<DIV>
<P class=3DMsoNormal>M</P></DIV></DIV>
<P class=3DMsoNormal> </P>
<DIV>
<DIV>
<P class=3DMsoNormal>On Sun., Apr. 17, 2022, 2:49 p.m. Bob =
Spidell, <<A=20
class=3Dmoz-txt-link-freetext target=3D_blank=20
moz-do-not-send=3D"true">bspidell@comcast.net</A>> =
wrote:</P></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-TOP: medium none; BORDER-RIGHT: medium none; =
BORDER-BOTTOM: medium none; PADDING-BOTTOM: 0cm; PADDING-TOP: 0cm; =
PADDING-LEFT: 6pt; MARGIN-LEFT: 4.8pt; BORDER-LEFT: 1pt solid; =
PADDING-RIGHT: 0cm; MARGIN-RIGHT: 0cm">
<DIV>
<P class=3DMsoNormal style=3D"MARGIN-BOTTOM: 12pt">Michael, =
<BR><BR>Sounds=20
like you're implying the O-ringed accumulator is superior to the =
metal=20
ring (OEM) type? Wish I'd known about it when I rebuilt my O/D =
(I bought=20
the DWM 'uprated' accumulator).<BR><BR>I'll throw out another, =
very=20
unlikely, potential cause: the cone clutch could be stuck =
together. I've=20
heard of this happening, but have never experienced it my =
self--nor has=20
anyone I know--but it's theoretically possible (esp. if the =
clutch is=20
excessively worn). Could this be the reason the manual is =
adamant about=20
replacing the 8 strong springs, of two lengths, that oppose the=20
operating pistons on overhaul, regardless if they still seem=20
robust?<BR><BR></P>
<DIV>
<P class=3DMsoNormal>On 4/17/2022 9:31 AM, Michael Salter via =
Healeys=20
wrote:</P></DIV>
<BLOCKQUOTE style=3D"MARGIN-BOTTOM: 5pt; MARGIN-TOP: 5pt">
<DIV>
<DIV>
<P class=3DMsoNormal><SPAN=20
style=3D'FONT-SIZE: 12pt; FONT-FAMILY: =
"Arial",sans-serif'>Simon,</SPAN></P></DIV>
<DIV>
<P class=3DMsoNormal><SPAN=20
style=3D'FONT-SIZE: 12pt; FONT-FAMILY: =
"Arial",sans-serif'>Based upon=20
your synopsis I conclude that the operating valve is NOT =
opening when=20
either the solenoid lever or the setting lever is being moved =
to the=20
position where the operating valve ball would normally be =
lifted off=20
its seat.</SPAN></P></DIV>
<DIV>
<P class=3DMsoNormal><SPAN=20
style=3D'FONT-SIZE: 12pt; FONT-FAMILY: =
"Arial",sans-serif'>This=20
conclusion is based upon your discovery that the pressure in =
the=20
accumulator, as indicated on the gauge, does not leak away=20
overnight.</SPAN></P></DIV>
<DIV>
<P class=3DMsoNormal><SPAN=20
style=3D'FONT-SIZE: 12pt; FONT-FAMILY: =
"Arial",sans-serif'>There is a=20
small clearance between the operating valve push rod and the =
overdrive=20
housing. If the operating valve ball was indeed lifted off its =
seat=20
all the oil in the accumulator would, over time, leak past the =
operating rod thus discharge the accumulator. =
</SPAN></P></DIV>
<DIV>
<P class=3DMsoNormal><SPAN=20
style=3D'FONT-SIZE: 12pt; FONT-FAMILY: =
"Arial",sans-serif'>This process=20
would indeed take some time but would certainly completely =
relieve=20
most, if not all the residual accumulator pressure=20
overnight.</SPAN></P></DIV>
<DIV>
<P class=3DMsoNormal><SPAN=20
style=3D'FONT-SIZE: 12pt; FONT-FAMILY: "Arial",sans-serif'>If =
however=20
the operating valve ball is still in contact with its seat =
(i.e. not=20
being lifted) the oil pressure would not reach the small =
clearance=20
between the valve push rod and the housing and, other than =
past the=20
accumulator rings there is nowhere for that pressure to be =
relieved.=20
</SPAN></P></DIV>
<DIV>
<P class=3DMsoNormal><SPAN=20
style=3D'FONT-SIZE: 12pt; FONT-FAMILY: "Arial",sans-serif'>I =
would=20
presume that Overdrive Spares installed an accumulator with an =
"O"=20
ring rather than the original cast iron rings. If the original =
type=20
accumulator piston was still fitted, oil would seep past the =
cast iron=20
rings to relieve the pressure, albeit very slowly, and again =
the=20
accumulator pressure would be discharged =
overnight..</SPAN></P></DIV>
<DIV>
<P class=3DMsoNormal><SPAN=20
style=3D'FONT-SIZE: 12pt; FONT-FAMILY: "Arial",sans-serif'>The =
cam on=20
the operating shaft, the one which lifts the operating valve =
push rod=20
and thus the operating valve ball, is locked to the shaft with =
a small=20
taper pin. I would guess that the taper pin has either fallen =
out or=20
sheared. </SPAN></P></DIV>
<DIV>
<P class=3DMsoNormal><SPAN=20
style=3D'FONT-SIZE: 12pt; FONT-FAMILY: "Arial",sans-serif'>Bad =
news is=20
that this pin cannot be accessed without removing and =
disassembling=20
the overdrive.</SPAN></P></DIV>
<DIV>
<P class=3DMsoNormal><SPAN=20
style=3D'FONT-SIZE: 12pt; FONT-FAMILY: =
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<P class=3DMsoNormal><SPAN=20
style=3D'FONT-SIZE: 12pt; FONT-FAMILY: =
"Arial",sans-serif'>M</SPAN></P></DIV></DIV>
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<P class=3DMsoNormal>On Sat, Apr 16, 2022 at 1:19 PM Simon =
Lachlan via=20
Healeys <<A class=3Dmoz-txt-link-freetext target=3D_blank=20
moz-do-not-send=3D"true">healeys@autox.team.net</A>> =
wrote:</P></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-TOP: medium none; BORDER-RIGHT: medium none; =
BORDER-BOTTOM: medium none; PADDING-BOTTOM: 0cm; PADDING-TOP: 0cm; =
PADDING-LEFT: 6pt; MARGIN-LEFT: 4.8pt; BORDER-LEFT: 1pt solid; =
PADDING-RIGHT: 0cm; MARGIN-RIGHT: 0cm">
<DIV>
<DIV>
<P class=3DMsoNormal>My OD is driving me mad and I =
definitely need=20
some inspired advice. A bit of background first. =
I=E2=80=99ll try to lay out=20
all the facts in a logical sequence. (I=E2=80=99m =
increasingly reluctant to=20
link ODs with logic!)</P>
<OL type=3D1>
<LI class=3DMsoNormal>I=E2=80=99d say that the OD has done =
+/- 15k miles=20
since a total rebuild by Overdrive Spares here in UK.=20
<LI class=3DMsoNormal>The OD had issues before Christmas =
(21) and=20
was sorted out by OD Spares. The accumulator was uprated =
and=20
pressure issues sorted.=20
<LI class=3DMsoNormal>OD functioned 100% on the few times =
I=E2=80=99d been=20
able to take it out since then until..=20
<LI class=3DMsoNormal>One day, the OD stopped functioning. =
<LI class=3DMsoNormal>I checked the electrics. All fine =
there so I=20
delved a bit deeper.=20
<LI class=3DMsoNormal>It had fried its solenoid which I =
replaced.=20
But=E2=80=A6=20
<LI class=3DMsoNormal>That did not fix the problem =
so=E2=80=A6=20
<LI class=3DMsoNormal>I decided that the operating =
valve=E2=80=99s=20
adjustment might be off so..=20
<LI class=3DMsoNormal>I bought a dial gauge and hoped to =
sort it out=20
precisely rather than by =E2=80=9Cfeel=E2=80=9D, which I =
lack in this area.=20
<LI class=3DMsoNormal>Prior to using the gauge I decided =
to see if=20
the OD was functioning at all so I raised the car on =
stands and=20
fitted my pressure gauge.=20
<LI class=3DMsoNormal>I get a reading of 500psi rising a =
bit when I=20
rev the engine but I=E2=80=99d suppose that would drop =
when the oil warms=20
up.=20
<LI class=3DMsoNormal>BUT, and this is where things go=20
pear-shaped=E2=80=A6moving the little lever on the RHS up =
and down does=20
not engage/disengage OD. There is no change on the gauge =
to show=20
OD engaging or disengaging.=20
<LI class=3DMsoNormal>AND, the gauge stays at 500psi even =
when the=20
engine is off. Moving the lever 20 times has zero effect. =
Stayed=20
at 500 overnight!=20
<LI class=3DMsoNormal>Of course, I checked for dirt in the =
operating=20
valve area. None.=20
<LI class=3DMsoNormal>Likewise, the tiny hole in the =
=E2=80=9Cvalve =E2=80=93=20
operating=E2=80=9D (the spindle thing which the ball sits =
on)=E2=80=A6.that=E2=80=99s=20
clear. And surely, the pressure would diminish overnight =
if=20
something in that area was partially obstructed?=20
<LI class=3DMsoNormal>When I remove the pressure valve, =
there=E2=80=99s a=20
small spillage =E2=80=93 no more than you=E2=80=99d expect =
=E2=80=93 but repeating the=20
pressure gauge process only returns the same results.=20
<LI class=3DMsoNormal>I see in the bible according to =
Norman Nock=20
that =E2=80=9CHolding this lever with your thumb and index =
finger, you=20
should be able to push the lever down lightly about =
=E2=85=9C=E2=80=9D until you=20
feel a slight spring pressure resistance. The lever should =
go down=20
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=20
=E2=85=9D=E2=80=9D movement up & down in that lever. =
Well, my lever does move=20
and does lift the ball, but there=E2=80=99s not =
=E2=85=9D=E2=80=9D movement there. Could=20
that be the problem area???=20
<LI class=3DMsoNormal>Almost finished=E2=80=A6keep =
reading! </LI></OL>
<P class=3DMsoNormal style=3D"MARGIN-LEFT: 18pt">So, =
I=E2=80=99m stumped. Every=20
time I learn something new about the OD, it has a new trick =
to=20
baffle me.</P>
<P class=3DMsoNormal style=3D"MARGIN-LEFT: =
18pt">I=E2=80=99ve no 100% sure way=20
of telling whether it=E2=80=99s gone into OD and stuck =
there or=20
whether it=E2=80=99s simply not going into OD at all.</P>
<P class=3DMsoNormal style=3D"MARGIN-LEFT: =
18pt">I=E2=80=99ve done a lot of=20
reading through my books and collection of advice from the =
various=20
gurus and found reference to ODs being stuck but those =
seemed to be=20
to do with =E2=80=9Cweak springs=E2=80=9D which, =
particularly after a long lay-off,=20
wouldn=E2=80=99t disengage. The cure for this being a good =
smack on the=20
steel plate sandwiched in the OD from below. Well, that =
seems to be=20
a stuck mechanism issue whereas I=E2=80=99m facing a =
hydraulic conundrum. Or=20
am I?</P>
<P class=3DMsoNormal style=3D"MARGIN-LEFT: 18pt">There is =
what is=20
usually referred to as the =E2=80=9Cpressure relief =
valve=E2=80=9D adjacent to the=20
accumulator. The name suggested that pressure might be stuck =
in that=20
area=E2=80=A6.but surely not overnight?</P>
<P class=3DMsoNormal style=3D"MARGIN-LEFT: 18pt"> </P>
<P class=3DMsoNormal style=3D"MARGIN-LEFT: 18pt">Any ideas? =
I am=20
particularly reluctant to take the gearbox and OD out. =
You=E2=80=99ll recall=20
the ridiculous business of the defective clutch kit? Well, I =
forget=20
whether we had the box in and out 3 times or 4. I=E2=80=99d =
hoped not to do=20
it again so soon or ever for that matter.</P>
<P class=3DMsoNormal style=3D"MARGIN-LEFT: 18pt"> </P>
<P class=3DMsoNormal style=3D"MARGIN-LEFT: 18pt">I=E2=80=99m =
hoping for a=20
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=3DMsoNormal style=3D"MARGIN-LEFT: 18pt"> </P>
<P class=3DMsoNormal style=3D"MARGIN-LEFT: 18pt">Thanks,</P>
<P class=3DMsoNormal=20
style=3D"MARGIN-LEFT: =
18pt">Simon</P><BR></DIV></DIV></BLOCKQUOTE></DIV></BLOCKQUOTE></DIV></BL=
OCKQUOTE></DIV></BLOCKQUOTE></DIV></DIV></BLOCKQUOTE></DIV></BLOCKQUOTE><=
BR>
<P>
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