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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.
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.
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 bit
> of background first. I=E2=80=99ll try to lay out all the facts in a logic=
al
> 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 re=
build 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 i=
t 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 of=
f 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 pressur=
e
> 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 li=
ttle
> 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.
> 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 surel=
y, 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 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.
> 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 sp=
ring pressure
> resistance. The lever should go down another =C2=BC=E2=80=9D after enc=
ountering 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, i=
t has a
> new trick to baffle me.
>
> I=E2=80=99ve no 100% sure way of telling whether it=E2=80=99s gone into O=
D 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 adv=
ice 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 s=
teel 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 valv=
e=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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>
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>
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>
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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,sa=
ns-serif;font-size:small">Simon,</div><div class=3D"gmail_default" style=3D=
"font-family:arial,sans-serif;font-size:small">Based upon your synopsis I c=
onclude that the operating valve is NOT opening when either the solenoid le=
ver 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=3D"gmail=
_default" style=3D"font-family:arial,sans-serif;font-size:small">This concl=
usion is based upon your discovery that the pressure in the accumulator, as=
indicated on the gauge, does not leak away overnight.</div><div class=3D"g=
mail_default" style=3D"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 th=
e oil in the accumulator would, over time, leak past the operating rod thus=
discharge the accumulator. <br></div><div class=3D"gmail_default" style=3D=
"font-family:arial,sans-serif;font-size:small">This process would indeed ta=
ke some time but would certainly completely relieve most, if not all the re=
sidual accumulator pressure overnight.</div><div class=3D"gmail_default" st=
yle=3D"font-family:arial,sans-serif;font-size:small">If however the operati=
ng 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 ro=
d and the housing and, other than past the accumulator rings there is nowhe=
re for that pressure to be relieved. <br></div><div class=3D"gmail_default"=
style=3D"font-family:arial,sans-serif;font-size:small">I would presume tha=
t Overdrive Spares installed an accumulator with an "O" ring rath=
er than the original cast iron rings. If the original type accumulator pist=
on 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=3D"gmail_default" style=3D"font-=
family:arial,sans-serif;font-size:small">The cam on the operating shaft, th=
e 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 th=
e taper pin has either fallen out or sheared. <br></div><div class=3D"gmail=
_default" style=3D"font-family:arial,sans-serif;font-size:small">Bad news i=
s that this pin cannot be accessed without removing and disassembling the o=
verdrive.</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 Sat, Apr 16, 2022=
at 1:19 PM Simon Lachlan via Healeys <<a href=3D"mailto:healeys@autox.t=
eam.net">healeys@autox.team.net</a>> wrote:<br></div><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex"><div lang=3D"EN-GB"><div class=3D"gmail-m_=
3258398681717990986WordSection1"><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 the facts in a logical sequence. (I=E2=80=
=99m increasingly reluctant to link ODs with logic!)<u></u><u></u></p><ol s=
tyle=3D"margin-top:0cm" type=3D"1" start=3D"1"><li class=3D"gmail-m_3258398=
681717990986MsoListParagraph" style=3D"margin-left:0cm">I=E2=80=99d say tha=
t the OD has done +/- 15k miles since a total rebuild by Overdrive Spares h=
ere in UK.<u></u><u></u></li><li class=3D"gmail-m_3258398681717990986MsoLis=
tParagraph" style=3D"margin-left:0cm">The OD had issues before Christmas (2=
1) and was sorted out by OD Spares. The accumulator was uprated and pressur=
e issues sorted.<u></u><u></u></li><li class=3D"gmail-m_3258398681717990986=
MsoListParagraph" style=3D"margin-left:0cm">OD functioned 100% on the few t=
imes I=E2=80=99d been able to take it out since then until..<u></u><u></u><=
/li><li class=3D"gmail-m_3258398681717990986MsoListParagraph" style=3D"marg=
in-left:0cm">One day, the OD stopped functioning.<u></u><u></u></li><li cla=
ss=3D"gmail-m_3258398681717990986MsoListParagraph" style=3D"margin-left:0cm=
">I checked the electrics. All fine there so I delved a bit deeper.<u></u><=
u></u></li><li class=3D"gmail-m_3258398681717990986MsoListParagraph" style=
=3D"margin-left:0cm">It had fried its solenoid which I replaced. But=E2=80=
=A6<u></u><u></u></li><li class=3D"gmail-m_3258398681717990986MsoListParagr=
aph" style=3D"margin-left:0cm">That did not fix the problem so=E2=80=A6<u><=
/u><u></u></li><li class=3D"gmail-m_3258398681717990986MsoListParagraph" st=
yle=3D"margin-left:0cm">I decided that the operating valve=E2=80=99s adjust=
ment might be off so..<u></u><u></u></li><li class=3D"gmail-m_3258398681717=
990986MsoListParagraph" style=3D"margin-left:0cm">I bought a dial gauge and=
hoped to sort it out precisely rather than by =E2=80=9Cfeel=E2=80=9D, whic=
h I lack in this area.<u></u><u></u></li><li class=3D"gmail-m_3258398681717=
990986MsoListParagraph" style=3D"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 st=
ands and fitted my pressure gauge.<u></u><u></u></li><li class=3D"gmail-m_3=
258398681717990986MsoListParagraph" style=3D"margin-left:0cm">I get a readi=
ng of 500psi rising a bit when I rev the engine but I=E2=80=99d suppose tha=
t would drop when the oil warms up.<u></u><u></u></li><li class=3D"gmail-m_=
3258398681717990986MsoListParagraph" style=3D"margin-left:0cm">BUT, and thi=
s 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.<u></u><u></u></li><li class=3D"gmail-m_=
3258398681717990986MsoListParagraph" style=3D"margin-left:0cm">AND, the gau=
ge stays at 500psi even when the engine is off. Moving the lever 20 times h=
as zero effect. Stayed at 500 overnight!<u></u><u></u></li><li class=3D"gma=
il-m_3258398681717990986MsoListParagraph" style=3D"margin-left:0cm">Of cour=
se, I checked for dirt in the operating valve area. None.<u></u><u></u></li=
><li class=3D"gmail-m_3258398681717990986MsoListParagraph" style=3D"margin-=
left:0cm">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=99=
s clear. And surely, the pressure would diminish overnight if something in =
that area was partially obstructed?<u></u><u></u></li><li class=3D"gmail-m_=
3258398681717990986MsoListParagraph" style=3D"margin-left:0cm">When I remov=
e the pressure valve, there=E2=80=99s a small spillage =E2=80=93 no more th=
an you=E2=80=99d expect =E2=80=93 but repeating the pressure gauge process =
only returns the same results.<u></u><u></u></li><li class=3D"gmail-m_32583=
98681717990986MsoListParagraph" style=3D"margin-left:0cm">I see in the bibl=
e 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 resista=
nce=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 lif=
t the ball, but there=E2=80=99s not =E2=85=9D=E2=80=9D movement there. Coul=
d that be the problem area???<u></u><u></u></li><li class=3D"gmail-m_325839=
8681717990986MsoListParagraph" style=3D"margin-left:0cm">Almost finished=E2=
=80=A6keep reading!<u></u><u></u></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.<u></u><u></u></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.<u></u><u></u></p><p class=3D"=
MsoNormal" style=3D"margin-left:18pt">I=E2=80=99ve done a lot of reading th=
rough my books and collection of advice from the various gurus and found re=
ference 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 sandwic=
hed in the OD from below. Well, that seems to be a stuck mechanism issue wh=
ereas I=E2=80=99m facing a hydraulic conundrum. Or am I?<u></u><u></u></p><=
p class=3D"MsoNormal" style=3D"margin-left:18pt">There is what is usually r=
eferred to as the =E2=80=9Cpressure relief valve=E2=80=9D adjacent to the a=
ccumulator. The name suggested that pressure might be stuck in that area=E2=
=80=A6.but surely not overnight?<u></u><u></u></p><p class=3D"MsoNormal" st=
yle=3D"margin-left:18pt"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal" sty=
le=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 de=
fective clutch kit? Well, I forget whether we had the box in and out 3 time=
s or 4. I=E2=80=99d hoped not to do it again so soon or ever for that matte=
r.<u></u><u></u></p><p class=3D"MsoNormal" style=3D"margin-left:18pt"><u></=
u>=C2=A0<u></u></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 god=
send=E2=80=A6=E2=80=A6=E2=80=A6=E2=80=A6<u></u><u></u></p><p class=3D"MsoNo=
rmal" style=3D"margin-left:18pt"><u></u>=C2=A0<u></u></p><p class=3D"MsoNor=
mal" style=3D"margin-left:18pt">Thanks,<u></u><u></u></p><p class=3D"MsoNor=
mal" style=3D"margin-left:18pt">Simon<u></u><u></u></p><p class=3D"MsoNorma=
l" style=3D"margin-left:18pt"><u></u>=C2=A0<u></u></p></div></div>_________=
______________________________________<br>
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