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MICHAEL-GOOD ASSESSMENT OF THE ISSUE! THAT PRESSURE HAS TO FIND A PATH=
=0ATO BLEED DOWN...SLOWLY. IN MY SYNOPSIS, I FOOLISHLY ONLY MENTIONED TH=
E=0ATWO RELIEF SPRINGS AS CULPRITS...I MEANT TO SAY BALLS & springs, On=
=0Athe early OD, and many of the later ones, the two relief balls are=0A=
different sizes- one is 1/4" and the other is 5/16" Somewhere, I wrote=
=0Awhich is which...(think the oil pump is 5/16 not 1/4") will have to=
=0Alocate info. BUT, if they are reversed the valve balls will not=0Afun=
ction correctly. One way causes it to leak-no pressure, and the=0Aother=
way it could be jammed and not releasing.=0ASimon's lever has limited t=
ravel-jammed? A friend had no pressure=0Aafter assembling his unit-rever=
sed the balls and it then worked=0Aperfect-400lbs and proper operation.=
Hank=0A=0A=09-----------------------------------------From: "Michael Sa=
lter via=0AHealeys" =0ATo: "Simon Lachlan"=0ACc: "Healeys"=0ASent: Sunda=
y April 17 2022 9:32:36AM=0ASubject: Re: [Healeys] Overdrive pressure no=
t releasing.=0A=0A Simon, Based upon your synopsis I conclude that the=
operating valve=0Ais NOT opening when either the solenoid lever or the=
setting lever is=0Abeing moved to the position where the operating valv=
e ball would=0Anormally be lifted off its seat. This conclusion is based=
upon your=0Adiscovery that the pressure in the accumulator, as indicate=
d on the=0Agauge, does not leak away overnight. There is a small clearan=
ce=0Abetween the operating valve push rod and the overdrive housing. If=
the=0Aoperating valve ball was indeed lifted off its seat all the oil i=
n the=0Aaccumulator would, over time, leak past the operating rod thus=
=0Adischarge the accumulator.=0A This process would indeed take some tim=
e but would certainly=0Acompletely relieve most, if not all the residual=
accumulator pressure=0Aovernight. If however the operating valve ball i=
s still in contact=0Awith its seat (i.e. not being lifted) the oil press=
ure would not reach=0Athe small clearance between the valve push rod and=
the housing and,=0Aother than past the accumulator rings there is nowhe=
re for that=0Apressure to be relieved.=0A I would presume that Overdrive=
Spares installed an accumulator with=0Aan "O" ring rather than the orig=
inal cast iron rings. If the original=0Atype accumulator piston was stil=
l fitted, oil would seep past the cast=0Airon rings to relieve the press=
ure, albeit very slowly, and again the=0Aaccumulator pressure would be d=
ischarged overnight..=0A The cam on the operating shaft, the one which l=
ifts the operating=0Avalve push rod and thus the operating valve ball, i=
s locked to the=0Ashaft with a small taper pin. I would guess that the t=
aper pin has=0Aeither fallen out or sheared.=0A Bad news is that this pi=
n cannot be accessed without removing and=0Adisassembling the overdrive.=
=0A M=0A=0A On Sat, Apr 16, 2022 at 1:19 PM Simon Lachlan via Healeys =
wrote:=0A=0A=09My OD is driving me mad and I definitely need some inspi=
red advice. A=0Abit of background first. I=E2=80=99ll try to lay out all=
the facts in a=0Alogical sequence. (I=E2=80=99m increasingly reluctant=
to link ODs with=0Alogic!) =0A=0A=09* I=E2=80=99d say that the OD has d=
one +/- 15k miles since a total rebuild=0Aby Overdrive Spares here in UK=
.=0A =09* The OD had issues before Christmas (21) and was sorted out by=
OD=0ASpares. The accumulator was uprated and pressure issues sorted.=0A=
=09* OD functioned 100% on the few times I=E2=80=99d been able to take=
it out=0Asince then until..=0A =09* One day, the OD stopped functioning=
.=0A =09* I checked the electrics. All fine there so I delved a bit deep=
er.=0A =09* It had fried its solenoid which I replaced. But=E2=80=A6=0A=
=09* That did not fix the problem so=E2=80=A6=0A =09* I decided that th=
e operating valve=E2=80=99s adjustment might be off=0Aso..=0A =09* I bou=
ght a dial gauge and hoped to sort it out precisely rather=0Athan by =E2=
=80=9Cfeel=E2=80=9D, which I lack in this area.=0A =09* Prior to using t=
he gauge I decided to see if the OD was=0Afunctioning at all so I raised=
the car on stands and fitted my=0Apressure gauge.=0A =09* I get a readi=
ng of 500psi rising a bit when I rev the engine but=0AI=E2=80=99d suppos=
e that would drop when the oil warms up.=0A =09* BUT, and this is where=
things go pear-shaped=E2=80=A6moving the little=0Alever on the RHS up a=
nd down does not engage/disengage OD. There is no=0Achange on the gauge=
to show OD engaging or disengaging.=0A =09* AND, the gauge stays at 500=
psi even when the engine is off. Moving=0Athe lever 20 times has zero ef=
fect. Stayed at 500 overnight!=0A =09* Of course, I checked for dirt in=
the operating valve area. None.=0A =09* Likewise, the tiny hole in the=
=E2=80=9Cvalve =E2=80=93 operating=E2=80=9D (the=0Aspindle thing which=
the ball sits on)=E2=80=A6.that=E2=80=99s clear. And surely,=0Athe pres=
sure would diminish overnight if something in that area was=0Apartially=
obstructed?=0A =09* When I remove the pressure valve, there=E2=80=99s a=
small spillage =E2=80=93=0Ano more than you=E2=80=99d expect =E2=80=93=
but repeating the pressure gauge=0Aprocess only returns the same result=
s.=0A =09* I see in the bible according to Norman Nock that =E2=80=9CHol=
ding this=0Alever with your thumb and index finger, you should be able t=
o push the=0Alever down lightly about =E2=85=9C=E2=80=9D until you feel=
a slight spring=0Apressure resistance. The lever should go down another=
=C2=BC=E2=80=9D after=0Aencountering the resistance=E2=80=A6=E2=80=A6=
=E2=80=9D ie there=E2=80=99s about =E2=85=9D=E2=80=9D=0Amovement up & do=
wn in that lever. Well, my lever does move and does=0Alift the ball, but=
there=E2=80=99s not =E2=85=9D=E2=80=9D movement there. Could that be=0A=
the problem area???=0A =09* Almost finished=E2=80=A6keep reading!=0A=0A=
=09So, I=E2=80=99m stumped. Every time I learn something new about the O=
D, it=0Ahas a new trick to baffle me. =0A=0A=09I=E2=80=99ve no 100% sure=
way of telling whether it=E2=80=99s gone into OD and=0Astuck there or w=
hether it=E2=80=99s simply not going into OD at all. =0A=0A=09I=E2=80=99=
ve done a lot of reading through my books and collection of=0Aadvice fro=
m the various gurus and found reference to ODs being stuck=0Abut those s=
eemed to be to do with =E2=80=9Cweak springs=E2=80=9D which,=0Aparticula=
rly after a long lay-off, wouldn=E2=80=99t disengage. The cure for=0Athi=
s being a good smack on the steel plate sandwiched in the OD from=0Abelo=
w. Well, that seems to be a stuck mechanism issue whereas I=E2=80=99m=0A=
facing a hydraulic conundrum. Or am I? =0A=0A=09There is what is usually=
referred to as the =E2=80=9Cpressure relief=0Avalve=E2=80=9D adjacent t=
o the accumulator. The name suggested that pressure=0Amight be stuck in=
that area=E2=80=A6.but surely not overnight? =0A=0A=09Any ideas? I am p=
articularly reluctant to take the gearbox and OD=0Aout. You=E2=80=99ll r=
ecall the ridiculous business of the defective clutch=0Akit? Well, I for=
get whether we had the box in and out 3 times or 4.=0AI=E2=80=99d hoped=
not to do it again so soon or ever for that matter. =0A=0A=09I=E2=80=99=
m hoping for a miracle of course but some sound advice would be a=0Agods=
end=E2=80=A6=E2=80=A6=E2=80=A6=E2=80=A6 =0A=0A=09Thanks, =0A=0A=09Simon=
=0A=0A=09 _______________________________________________=0A Support=
Team.Net [1]http://www.team.net/donate.html [2]=0A Suggested annual do=
nation $12.75=0A=0A Archive: [3]http://www.team.net/pipermail/healeys [=
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--=_7eb6add042f443bfa697b39a899195e2
Content-Transfer-Encoding: quoted-printable
<html><body>Michael-good assessment of the issue! That pressure has to f=
ind a path to bleed down...slowly. In my synopsis, I foolishly only ment=
ioned the two relief springs as culprits...I meant to say <b>balls</b> &=
amp; springs, On the early OD, and many of the later ones, the two relie=
f balls are different sizes- one is 1/4" and the other is 5/16" Somewher=
e, I wrote which is which...(think the oil pump is 5/16 not 1/4") will h=
ave to locate info. BUT, if they are reversed the valve balls will not f=
unction 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 le=
ver has limited travel-jammed? A friend had no pressure after assembling=
his unit-reversed the balls and it then worked perfect-400lbs and prope=
r operation. Hank<br><br><div class=3D"reply-new-signature"></div><p>---=
--------------------------------------</p>From: "Michael Salter via Heal=
eys" <healeys@autox.team.net><br>To: "Simon Lachlan"<br>Cc: "Healeys"<br=
>Sent: Sunday April 17 2022 9:32:36AM<br>Subject: Re: [Healeys] Overdriv=
e pressure not releasing.<br><br>=0A<div dir=3D"ltr">=0A<div class=3D"gm=
ail_default" style=3D"font-family:arial, sans-serif;font-size:small;">Si=
mon,</div>=0A<div class=3D"gmail_default" style=3D"font-family:arial, sa=
ns-serif;font-size:small;">Based upon your=0Asynopsis I conclude that th=
e operating valve is NOT opening when=0Aeither the solenoid lever or the=
setting lever is being moved to=0Athe position where the operating valv=
e ball would normally be=0Alifted off its seat.</div>=0A<div class=3D"gm=
ail_default" style=3D"font-family:arial, sans-serif;font-size:small;">Th=
is conclusion is=0Abased upon your discovery that the pressure in the ac=
cumulator, as=0Aindicated on the gauge, does not leak away overnight.</d=
iv>=0A<div class=3D"gmail_default" style=3D"font-family:arial, sans-seri=
f;font-size:small;">There is a small=0Aclearance between the operating v=
alve push rod and the overdrive=0Ahousing. If the operating valve ball w=
as indeed lifted off its seat=0Aall the oil in the accumulator would, ov=
er time, leak past the=0Aoperating rod thus discharge the accumulator.<b=
r></div>=0A<div class=3D"gmail_default" style=3D"font-family:arial, sans=
-serif;font-size:small;">This process would=0Aindeed take some time but=
would certainly completely relieve most,=0Aif not all the residual accu=
mulator pressure overnight.</div>=0A<div class=3D"gmail_default" style=
=3D"font-family:arial, sans-serif;font-size:small;">If however the=0Aope=
rating valve ball is still in contact with its seat (i.e. not=0Abeing li=
fted) the oil pressure would not reach the small clearance=0Abetween the=
valve push rod and the housing and, other than past the=0Aaccumulator r=
ings there is nowhere for that pressure to be=0Arelieved.<br></div>=0A<d=
iv class=3D"gmail_default" style=3D"font-family:arial, sans-serif;font-s=
ize:small;">I would presume that=0AOverdrive Spares installed an accumul=
ator with an "O" ring rather=0Athan the original cast iron rings. If the=
original type accumulator=0Apiston was still fitted, oil would seep pas=
t the cast iron rings to=0Arelieve the pressure, albeit very slowly, and=
again the accumulator=0Apressure would be discharged overnight..<br></d=
iv>=0A<div class=3D"gmail_default" style=3D"font-family:arial, sans-seri=
f;font-size:small;">The cam on the=0Aoperating shaft, the one which lift=
s the operating valve push rod=0Aand thus the operating valve ball, is l=
ocked to the shaft with a=0Asmall taper pin. I would guess that the tape=
r pin has either fallen=0Aout or sheared.<br></div>=0A<div class=3D"gmai=
l_default" style=3D"font-family:arial, sans-serif;font-size:small;">Bad=
news is that=0Athis pin cannot be accessed without removing and disasse=
mbling the=0Aoverdrive.</div>=0A<div class=3D"gmail_default" style=3D"fo=
nt-family:arial, sans-serif;font-size:small;"><br></div>=0A<div class=3D=
"gmail_default" style=3D"font-family:arial, sans-serif;font-size:small;"=
>M<br></div>=0A</div>=0A<br><div class=3D"gmail_quote">=0A<div dir=3D"lt=
r" class=3D"gmail_attr">On Sat, Apr 16, 2022 at 1:19 PM=0ASimon Lachlan=
via Healeys <<a>healeys@autox.team.net</a>>=0Awrote:<br></div>=0A=
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px .8ex;borde=
r-left:1px solid rgb(204,204,204);padding-left:1ex;">=0A<div lang=3D"en-=
gb">=0A<div class=3D"gmail-m_3258398681717990986WordSection1">=0A<p clas=
s=3D"MsoNormal">My OD is driving me mad and I definitely need=0Asome ins=
pired advice. A bit of background first. I=E2=80=99ll try to lay=0Aout a=
ll the facts in a logical sequence. (I=E2=80=99m increasingly=0Areluctan=
t to link ODs with logic!)</p>=0A<ol style=3D"margin-top:0cm;" type=3D"1=
" start=3D"1"><li class=3D"gmail-m_3258398681717990986MsoListParagraph"=
style=3D"margin-left:0cm;">I=E2=80=99d say that the OD has done +/- 15k=
miles since=0Aa total rebuild by Overdrive Spares here in UK.</li>=0A<l=
i class=3D"gmail-m_3258398681717990986MsoListParagraph" style=3D"margin-=
left:0cm;">The OD had issues before Christmas (21) and was=0Asorted out=
by OD Spares. The accumulator was uprated and pressure=0Aissues sorted.=
</li>=0A<li class=3D"gmail-m_3258398681717990986MsoListParagraph" style=
=3D"margin-left:0cm;">OD functioned 100% on the few times I=E2=80=99d be=
en able=0Ato take it out since then until..</li>=0A<li class=3D"gmail-m_=
3258398681717990986MsoListParagraph" style=3D"margin-left:0cm;">One day,=
the OD stopped functioning.</li>=0A<li class=3D"gmail-m_325839868171799=
0986MsoListParagraph" style=3D"margin-left:0cm;">I checked the electrics=
. All fine there so I=0Adelved a bit deeper.</li>=0A<li class=3D"gmail-m=
_3258398681717990986MsoListParagraph" style=3D"margin-left:0cm;">It had=
fried its solenoid which I replaced.=0ABut=E2=80=A6</li>=0A<li class=3D=
"gmail-m_3258398681717990986MsoListParagraph" style=3D"margin-left:0cm;"=
>That did not fix the problem so=E2=80=A6</li>=0A<li class=3D"gmail-m_32=
58398681717990986MsoListParagraph" style=3D"margin-left:0cm;">I decided=
that the operating valve=E2=80=99s adjustment=0Amight be off so..</li>=
=0A<li class=3D"gmail-m_3258398681717990986MsoListParagraph" style=3D"ma=
rgin-left:0cm;">I bought a dial gauge and hoped to sort it out=0Aprecise=
ly rather than by =E2=80=9Cfeel=E2=80=9D, which I lack in this area.</li=
>=0A<li class=3D"gmail-m_3258398681717990986MsoListParagraph" style=3D"m=
argin-left:0cm;">Prior to using the gauge I decided to see if the=0AOD w=
as functioning at all so I raised the car on stands and fitted=0Amy pres=
sure gauge.</li>=0A<li class=3D"gmail-m_3258398681717990986MsoListParagr=
aph" style=3D"margin-left:0cm;">I get a reading of 500psi rising a bit w=
hen I rev=0Athe engine but I=E2=80=99d suppose that would drop when the=
oil warms=0Aup.</li>=0A<li class=3D"gmail-m_3258398681717990986MsoListP=
aragraph" style=3D"margin-left:0cm;">BUT, and this is where things go=0A=
pear-shaped=E2=80=A6moving the little lever on the RHS up and down does=
not=0Aengage/disengage OD. There is no change on the gauge to show OD=
=0Aengaging or disengaging.</li>=0A<li class=3D"gmail-m_3258398681717990=
986MsoListParagraph" style=3D"margin-left:0cm;">AND, the gauge stays at=
500psi even when the=0Aengine is off. Moving the lever 20 times has zer=
o effect. Stayed at=0A500 overnight!</li>=0A<li class=3D"gmail-m_3258398=
681717990986MsoListParagraph" style=3D"margin-left:0cm;">Of course, I ch=
ecked for dirt in the operating=0Avalve area. None.</li>=0A<li class=3D"=
gmail-m_3258398681717990986MsoListParagraph" style=3D"margin-left:0cm;">=
Likewise, the tiny hole in the =E2=80=9Cvalve =E2=80=93=0Aoperating=E2=
=80=9D (the spindle thing which the ball sits on)=E2=80=A6.that=E2=80=99=
s=0Aclear. And surely, the pressure would diminish overnight if=0Asometh=
ing in that area was partially obstructed?</li>=0A<li class=3D"gmail-m_3=
258398681717990986MsoListParagraph" style=3D"margin-left:0cm;">When I re=
move the pressure valve, there=E2=80=99s a small=0Aspillage =E2=80=93 no=
more than you=E2=80=99d expect =E2=80=93 but repeating the pressure=0Ag=
auge process only returns the same results.</li>=0A<li class=3D"gmail-m_=
3258398681717990986MsoListParagraph" style=3D"margin-left:0cm;">I see in=
the bible according to Norman Nock that=0A=E2=80=9CHolding this lever w=
ith your thumb and index finger, you should be=0Aable to push the lever=
down lightly about =E2=85=9C=E2=80=9D until you feel a=0Aslight spring=
pressure resistance. The lever should go down another=0A=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=0Amovement up & down in that lev=
er. Well, my lever does move and does=0Alift the ball, but there=E2=80=
=99s not =E2=85=9D=E2=80=9D movement there. Could that be the=0Aproblem=
area???</li>=0A<li class=3D"gmail-m_3258398681717990986MsoListParagraph=
" style=3D"margin-left:0cm;">Almost finished=E2=80=A6keep reading!</li>=
=0A</ol><p class=3D"MsoNormal" style=3D"margin-left:18pt;">So, I=E2=80=
=99m stumped.=0AEvery time I learn something new about the OD, it has a=
new trick=0Ato baffle me.</p>=0A<p class=3D"MsoNormal" style=3D"margin-=
left:18pt;">I=E2=80=99ve no 100% sure way=0Aof telling whether it=E2=80=
=99s gone into OD and stuck there or=0Awhether it=E2=80=99s simply=
not going into OD at all.</p>=0A<p class=3D"MsoNormal" style=3D"margin-=
left:18pt;">I=E2=80=99ve done a lot of=0Areading through my books and co=
llection of advice from the various=0Agurus and found reference to ODs b=
eing stuck but those seemed to be=0Ato do with =E2=80=9Cweak springs=E2=
=80=9D which, particularly after a long lay-off,=0Awouldn=E2=80=99t dise=
ngage. The cure for this being a good smack on the=0Asteel plate sandwic=
hed in the OD from below. Well, that seems to be=0Aa stuck mechanism iss=
ue whereas I=E2=80=99m facing a hydraulic conundrum.=0AOr am I?</p>=0A<p=
class=3D"MsoNormal" style=3D"margin-left:18pt;">There is what is=0Ausua=
lly referred to as the =E2=80=9Cpressure relief valve=E2=80=9D adjacent=
to the=0Aaccumulator. The name suggested that pressure might be stuck i=
n=0Athat area=E2=80=A6.but surely not overnight?</p>=0A<p class=3D"MsoNo=
rmal" style=3D"margin-left:18pt;"> </p>=0A<p class=3D"MsoNormal" st=
yle=3D"margin-left:18pt;">Any ideas? I am=0Aparticularly reluctant to ta=
ke the gearbox and OD out. You=E2=80=99ll=0Arecall the ridiculous busine=
ss of the defective clutch kit? Well, I=0Aforget whether we had the box=
in and out 3 times or 4. I=E2=80=99d hoped=0Anot to do it again so soon=
or ever for that matter.</p>=0A<p class=3D"MsoNormal" style=3D"margin-l=
eft:18pt;"> </p>=0A<p class=3D"MsoNormal" style=3D"margin-left:18pt=
;">I=E2=80=99m hoping for a=0Amiracle of course but some sound advice wo=
uld be a godsend=E2=80=A6=E2=80=A6=E2=80=A6=E2=80=A6</p>=0A<p class=3D"M=
soNormal" style=3D"margin-left:18pt;"> </p>=0A<p class=3D"MsoNormal=
" style=3D"margin-left:18pt;">Thanks,</p>=0A<p class=3D"MsoNormal" style=
=3D"margin-left:18pt;">Simon</p>=0A<p class=3D"MsoNormal" style=3D"margi=
n-left:18pt;"> </p>=0A</div>=0A</div>=0A___________________________=
____________________<br>=0ASupport Team.Net <a href=3D"http://www.team.n=
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