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<DIV>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.</DIV>
<DIV> </DIV>
<DIV>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</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: 'Century'; COLOR: #000000">David
Nock<BR>healeydoc@sbcglobal.net<BR>209 948
8767<BR>www.britishcarspecialists.com<BR><BR>Help us have our Founder Norman
Nock inducteed into the <BR>British Sportscar Hall of Fame, You can vote for
your favorites <BR>by visiting the site
at.<BR>www.britishsportscarhalloffame.org<BR></DIV>
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<DIV> </DIV>
<DIV style="BACKGROUND: #f5f5f5">
<DIV style="font-color: black"><B>From:</B> <A title=bspidell@comcast.net>Bob
Spidell</A> </DIV>
<DIV><B>Sent:</B> Monday, April 18, 2022 8:24 AM</DIV>
<DIV><B>To:</B> <A title=roggrace@telus.net>Roger Grace</A> ; <A
title=simon.lachlan@alexarevel.plus.com>simon.lachlan@alexarevel.plus.com</A>
</DIV>
<DIV><B>Cc:</B> <A title=healeys@autox.team.net>Healeys</A> </DIV>
<DIV><B>Subject:</B> Re: [Healeys] Overdrive pressure not
releasing.</DIV></DIV></DIV>
<DIV> </DIV></DIV>
<DIV
style='FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline'>Wouldn't
opening up an O/D with 500psi be kind of messy?<BR><BR>
<DIV class=moz-cite-prefix>On 4/18/2022 8:03 AM, Roger Grace wrote:<BR></DIV>
<BLOCKQUOTE
cite=mid:CALPtYiPAuYYR-hfN-O=EQ9jw7ZZoVJNJnhkNAX8MiSzgsuf+_Q@mail.gmail.com
type="cite">
<DIV dir=ltr>
<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
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
operate the cam and you should feel the operating rod move up and down on the
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
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> </DIV>
<DIV> </DIV></DIV>
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<DIV class=gmail_quote>
<DIV class=gmail_attr dir=ltr>On Sun, Apr 17, 2022 at 3:21 PM Simon Lachlan
via Healeys <<A class=moz-txt-link-freetext
moz-do-not-send="true">healeys@autox.team.net</A>> wrote:<BR></DIV>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; BORDER-LEFT: rgb(204,204,204) 1px solid; MARGIN: 0px 0px 0px 0.8ex">
<DIV lang=EN-GB>
<DIV class=gmail-m_246696034598963678WordSection1>
<P class=MsoNormal><SPAN>That’s the one I’ve got. I did get an increase in
pressure. No question about that.</SPAN></P>
<P class=MsoNormal><SPAN>I talked to Dave at OD Spares with regard to the
various accumulators out there at the moment. I don’t recall exactly but he
supplies all of them to his customers and, I think, to the
suppliers.</SPAN></P>
<P class=MsoNormal><SPAN>Simon</SPAN></P>
<P class=MsoNormal><SPAN></SPAN> </P>
<DIV>
<DIV
style="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=MsoNormal><B><SPAN lang=EN-US>From:</SPAN></B><SPAN lang=EN-US>
Healeys <<A class=moz-txt-link-freetext target=_blank
moz-do-not-send="true">healeys-bounces@autox.team.net</A>> <B>On Behalf
Of </B>Bob Spidell<BR><B>Sent:</B> 17 April 2022 23:06<BR><B>To:</B> Michael
Salter <<A class=moz-txt-link-freetext target=_blank
moz-do-not-send="true">michaelsalter@gmail.com</A>><BR><B>Cc:</B> <A
class=moz-txt-link-freetext target=_blank
moz-do-not-send="true">healeys@autox.team.net</A><BR><B>Subject:</B> Re:
[Healeys] Overdrive pressure not releasing.</SPAN></P></DIV></DIV>
<P class=MsoNormal> </P>
<P class=MsoNormal style="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 class=moz-txt-link-freetext
href="https://www.ahspares.co.uk/austin-healey/performance-parts/gearbox-overdrive/o-ring-conversion-accumulator-piston.aspx"
target=_blank
moz-do-not-send="true">https://www.ahspares.co.uk/austin-healey/performance-parts/gearbox-overdrive/o-ring-conversion-accumulator-piston.aspx</A><BR><BR></P>
<DIV>
<P class=MsoNormal>On 4/17/2022 12:03 PM, Michael Salter wrote:</P></DIV>
<BLOCKQUOTE style="MARGIN-BOTTOM: 5pt; MARGIN-TOP: 5pt">
<DIV>
<P class=MsoNormal>Actually Bob I've never used an "O" ringed
accumulator. </P>
<DIV>
<P class=MsoNormal>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. </P></DIV>
<DIV>
<P class=MsoNormal>Does anyone know how that has been solved?</P></DIV>
<DIV>
<P class=MsoNormal> </P></DIV>
<DIV>
<P class=MsoNormal>M</P></DIV></DIV>
<P class=MsoNormal> </P>
<DIV>
<DIV>
<P class=MsoNormal>On Sun., Apr. 17, 2022, 2:49 p.m. Bob Spidell, <<A
class=moz-txt-link-freetext target=_blank
moz-do-not-send="true">bspidell@comcast.net</A>> wrote:</P></DIV>
<BLOCKQUOTE
style="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=MsoNormal style="MARGIN-BOTTOM: 12pt">Michael, <BR><BR>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).<BR><BR>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?<BR><BR></P>
<DIV>
<P class=MsoNormal>On 4/17/2022 9:31 AM, Michael Salter via Healeys
wrote:</P></DIV>
<BLOCKQUOTE style="MARGIN-BOTTOM: 5pt; MARGIN-TOP: 5pt">
<DIV>
<DIV>
<P class=MsoNormal><SPAN
style='FONT-SIZE: 12pt; FONT-FAMILY: "Arial",sans-serif'>Simon,</SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style='FONT-SIZE: 12pt; FONT-FAMILY: "Arial",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=MsoNormal><SPAN
style='FONT-SIZE: 12pt; FONT-FAMILY: "Arial",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=MsoNormal><SPAN
style='FONT-SIZE: 12pt; FONT-FAMILY: "Arial",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=MsoNormal><SPAN
style='FONT-SIZE: 12pt; FONT-FAMILY: "Arial",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=MsoNormal><SPAN
style='FONT-SIZE: 12pt; FONT-FAMILY: "Arial",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=MsoNormal><SPAN
style='FONT-SIZE: 12pt; FONT-FAMILY: "Arial",sans-serif'>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..</SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style='FONT-SIZE: 12pt; FONT-FAMILY: "Arial",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=MsoNormal><SPAN
style='FONT-SIZE: 12pt; FONT-FAMILY: "Arial",sans-serif'>Bad news is
that this pin cannot be accessed without removing and disassembling
the overdrive.</SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style='FONT-SIZE: 12pt; FONT-FAMILY: "Arial",sans-serif'></SPAN> </P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style='FONT-SIZE: 12pt; FONT-FAMILY: "Arial",sans-serif'>M</SPAN></P></DIV></DIV>
<P class=MsoNormal> </P>
<DIV>
<DIV>
<P class=MsoNormal>On Sat, Apr 16, 2022 at 1:19 PM Simon Lachlan via
Healeys <<A class=moz-txt-link-freetext target=_blank
moz-do-not-send="true">healeys@autox.team.net</A>> wrote:</P></DIV>
<BLOCKQUOTE
style="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=MsoNormal>My OD is driving me mad and I definitely need
some inspired advice. A bit of background first. I’ll try to lay out
all the facts in a logical sequence. (I’m increasingly reluctant to
link ODs with logic!)</P>
<OL type=1>
<LI class=MsoNormal>I’d say that the OD has done +/- 15k miles
since a total rebuild by Overdrive Spares here in UK.
<LI class=MsoNormal>The OD had issues before Christmas (21) and
was sorted out by OD Spares. The accumulator was uprated and
pressure issues sorted.
<LI class=MsoNormal>OD functioned 100% on the few times I’d been
able to take it out since then until..
<LI class=MsoNormal>One day, the OD stopped functioning.
<LI class=MsoNormal>I checked the electrics. All fine there so I
delved a bit deeper.
<LI class=MsoNormal>It had fried its solenoid which I replaced.
But…
<LI class=MsoNormal>That did not fix the problem so…
<LI class=MsoNormal>I decided that the operating valve’s
adjustment might be off so..
<LI class=MsoNormal>I bought a dial gauge and hoped to sort it out
precisely rather than by “feel”, which I lack in this area.
<LI class=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 class=MsoNormal>I get a reading of 500psi rising a bit when I
rev the engine but I’d suppose that would drop when the oil warms
up.
<LI class=MsoNormal>BUT, and this is where things go
pear-shaped…moving 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 class=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 class=MsoNormal>Of course, I checked for dirt in the operating
valve area. None.
<LI class=MsoNormal>Likewise, the tiny hole in the “valve –
operating” (the spindle thing which the ball sits on)….that’s
clear. And surely, the pressure would diminish overnight if
something in that area was partially obstructed?
<LI class=MsoNormal>When I remove the pressure valve, there’s a
small spillage – no more than you’d expect – but repeating the
pressure gauge process only returns the same results.
<LI class=MsoNormal>I see in the bible according to Norman Nock
that “Holding this lever with your thumb and index finger, you
should be able to push the lever down lightly about ⅜” until you
feel a slight spring pressure resistance. The lever should go down
another ¼” after encountering the resistance……” ie there’s about
⅝” movement up & down in that lever. Well, my lever does move
and does lift the ball, but there’s not ⅝” movement there. Could
that be the problem area???
<LI class=MsoNormal>Almost finished…keep reading! </LI></OL>
<P class=MsoNormal style="MARGIN-LEFT: 18pt">So, I’m stumped. Every
time I learn something new about the OD, it has a new trick to
baffle me.</P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt">I’ve no 100% sure way
of telling whether it’s gone into OD and stuck there or
whether it’s simply not going into OD at all.</P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt">I’ve 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 “weak springs” which, particularly after a long lay-off,
wouldn’t 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’m facing a hydraulic conundrum. Or
am I?</P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt">There is what is
usually referred to as the “pressure relief valve” adjacent to the
accumulator. The name suggested that pressure might be stuck in that
area….but surely not overnight?</P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"> </P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt">Any ideas? I am
particularly reluctant to take the gearbox and OD out. You’ll 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’d hoped not to do
it again so soon or ever for that matter.</P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"> </P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt">I’m hoping for a
miracle of course but some sound advice would be a godsend…………</P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt"> </P>
<P class=MsoNormal style="MARGIN-LEFT: 18pt">Thanks,</P>
<P class=MsoNormal
style="MARGIN-LEFT: 18pt">Simon</P><BR></DIV></DIV></BLOCKQUOTE></DIV></BLOCKQUOTE></DIV></BLOCKQUOTE></DIV></BLOCKQUOTE></DIV></DIV></BLOCKQUOTE></DIV></BLOCKQUOTE><BR>
<P>
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