<html><body>Michael-good assessment of the issue! That pressure has to find a path to bleed down...slowly. In my synopsis, I foolishly only mentioned the two relief springs as culprits...I meant to say <b>balls</b> & springs, On the early OD, and many of the later ones, the two relief balls are different sizes- one is 1/4" and the other is 5/16" Somewhere, I wrote which is which...(think the oil pump is 5/16 not 1/4") will have to locate info. BUT, if they are reversed the valve balls will not function correctly. One way causes it to leak-no pressure, and the other way it could be jammed and not releasing.<div><br></div><div>Simon's lever has limited travel-jammed? A friend had no pressure after assembling his unit-reversed the balls and it then worked perfect-400lbs and proper operation. Hank<br><br><div class="reply-new-signature"></div><p>-----------------------------------------</p>From: "Michael Salter via Healeys" <healeys@autox.team.net><br>To: "Simon Lachlan"<br>Cc: "Healeys"<br>Sent: Sunday April 17 2022 9:32:36AM<br>Subject: Re: [Healeys] Overdrive pressure not releasing.<br><br>
<div dir="ltr">
<div class="gmail_default" style="font-family:arial, sans-serif;font-size:small;">Simon,</div>
<div class="gmail_default" style="font-family:arial, sans-serif;font-size:small;">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.</div>
<div class="gmail_default" style="font-family:arial, sans-serif;font-size:small;">This conclusion is
based upon your discovery that the pressure in the accumulator, as
indicated on the gauge, does not leak away overnight.</div>
<div class="gmail_default" style="font-family:arial, sans-serif;font-size:small;">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.<br></div>
<div class="gmail_default" style="font-family:arial, sans-serif;font-size:small;">This process would
indeed take some time but would certainly completely relieve most,
if not all the residual accumulator pressure overnight.</div>
<div class="gmail_default" style="font-family:arial, sans-serif;font-size:small;">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.<br></div>
<div class="gmail_default" style="font-family:arial, sans-serif;font-size:small;">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..<br></div>
<div class="gmail_default" style="font-family:arial, sans-serif;font-size:small;">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.<br></div>
<div class="gmail_default" style="font-family:arial, sans-serif;font-size:small;">Bad news is that
this pin cannot be accessed without removing and disassembling the
overdrive.</div>
<div class="gmail_default" style="font-family:arial, sans-serif;font-size:small;"><br></div>
<div class="gmail_default" style="font-family:arial, sans-serif;font-size:small;">M<br></div>
</div>
<br><div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sat, Apr 16, 2022 at 1:19 PM
Simon Lachlan via Healeys <<a>healeys@autox.team.net</a>>
wrote:<br></div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px .8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex;">
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<div class="gmail-m_3258398681717990986WordSection1">
<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 style="margin-top:0cm;" type="1" start="1"><li class="gmail-m_3258398681717990986MsoListParagraph" style="margin-left:0cm;">I’d say that the OD has done +/- 15k miles since
a total rebuild by Overdrive Spares here in UK.</li>
<li class="gmail-m_3258398681717990986MsoListParagraph" style="margin-left:0cm;">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="gmail-m_3258398681717990986MsoListParagraph" style="margin-left:0cm;">OD functioned 100% on the few times I’d been able
to take it out since then until..</li>
<li class="gmail-m_3258398681717990986MsoListParagraph" style="margin-left:0cm;">One day, the OD stopped functioning.</li>
<li class="gmail-m_3258398681717990986MsoListParagraph" style="margin-left:0cm;">I checked the electrics. All fine there so I
delved a bit deeper.</li>
<li class="gmail-m_3258398681717990986MsoListParagraph" style="margin-left:0cm;">It had fried its solenoid which I replaced.
But…</li>
<li class="gmail-m_3258398681717990986MsoListParagraph" style="margin-left:0cm;">That did not fix the problem so…</li>
<li class="gmail-m_3258398681717990986MsoListParagraph" style="margin-left:0cm;">I decided that the operating valve’s adjustment
might be off so..</li>
<li class="gmail-m_3258398681717990986MsoListParagraph" style="margin-left:0cm;">I bought a dial gauge and hoped to sort it out
precisely rather than by “feel”, which I lack in this area.</li>
<li class="gmail-m_3258398681717990986MsoListParagraph" style="margin-left:0cm;">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="gmail-m_3258398681717990986MsoListParagraph" style="margin-left:0cm;">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>
<li class="gmail-m_3258398681717990986MsoListParagraph" style="margin-left:0cm;">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>
<li class="gmail-m_3258398681717990986MsoListParagraph" style="margin-left:0cm;">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="gmail-m_3258398681717990986MsoListParagraph" style="margin-left:0cm;">Of course, I checked for dirt in the operating
valve area. None.</li>
<li class="gmail-m_3258398681717990986MsoListParagraph" style="margin-left:0cm;">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>
<li class="gmail-m_3258398681717990986MsoListParagraph" style="margin-left:0cm;">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>
<li class="gmail-m_3258398681717990986MsoListParagraph" style="margin-left:0cm;">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>
<li class="gmail-m_3258398681717990986MsoListParagraph" style="margin-left:0cm;">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>
<p class="MsoNormal" style="margin-left:18pt;"> </p>
</div>
</div>
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