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One other thing you could do before having to yank out the unit. Drain=
=0Athe oil, remove the operating valve, and the relief valve, and blow=
=0Asome air from the plug fitting using a rubber tipped blow gun,=0Athro=
ughout the unit. It may make an oil mess, but not as much a mess=0Aas ha=
ving to pull the transmission. This might possibly dislodge any=0Adebris=
blockage in the passages. If you reuse the same oil, strain it=0Athru a=
good sieve and look for debris.=0AThen be especially careful when refil=
ling the gearbox and OD as to not=0Aget any dirt into the opening. Be su=
re to check the screen and clean=0Ait with kerosene (paraffin) upon asse=
mbly. Hank=0A=0A=09-----------------------------------------From: gradea=
1@charter.net=0ATo: "simon.lachlan@alexarevel.plus.com"=0ACc: =0ASent: S=
aturday April 16 2022 12:12:34PM=0ASubject: RE: [Healeys] Overdrive pres=
sure not releasing.=0A=0A Hi Simon- I'm sure you read and re-read the ch=
apter G pg. 5=0Aparagraphs in the service manual. The fact that you have=
500lbs of=0Apressure is good, but then the notation of the pressure not=
releasing,=0Aindicates some kind of blockage in the oil passages that w=
ill not let=0Athe pressure drain. =0A Of course, dirt is the most common=
culprit. That is also why the book=0Asuggests lintless rags...the small=
est amount of debris can plug up=0Athese tiny drillings and prevent pres=
sure from draining. One rebuilder=0AI discuss these finicky ODs with, su=
ggests enlarging the drain hole in=0Athe operating valve body to 1mm. Th=
e other key item to check is the=0Atwo relief valve springs (ill. 16 & 5=
6 on plate G2). If reversed they=0Awill cause havoc with the pressure dr=
ain. If the accumulator is=0Astuck-not moving-it will hold the pressure=
as it must move past a=0Asmall drilling in the body to release it. That=
is a physical issue=0Awith the O-rings, or piston rings in that bore.=
=0A Actually, removing the plug from the operating valve with 500 lbs o=
f=0Apressure should have shot out the spring, ball and shaft. Since it=
=0Adribbled out, the blockage must be further down the pike. Operating=
=0Athe lever multiple times before removing the plug is to meant release=
=0Athat pressure. =0A If it has 500 lbs. of pressure, it is in OD! That=
pressure pushes the=0Atwo pistons (#11) toward the front of the trans c=
ompressing the 8=0Aclutch springs and placing the clutch facing into con=
tact with the sun=0Agear. =0A Trusting that OD spares properly reassembl=
ed the unit would be most=0Alogical, but maybe not. I think the answer i=
s still with them, and=0Aunfortunately you would have to bring them the=
unit (5th pull!) The=0Aproblem does not appear to be electrics/adjustme=
nt related. Regards,=0AHank=0A=0A=09------------------------------------=
----- From: "Simon Lachlan via=0AHealeys"=0A To: "Healeys"=0A Cc:=0A Sen=
t: Saturday April 16 2022 10:20:09AM=0A Subject: [Healeys] Overdrive pre=
ssure not releasing.=0A=0A=09My OD is driving me mad and I definitely ne=
ed some inspired advice. A=0Abit of background first. I=E2=80=99ll try t=
o lay out all the facts in a=0Alogical sequence. (I=E2=80=99m increasing=
ly reluctant to link ODs with=0Alogic!) =0A=0A=09* I=E2=80=99d say that=
the OD has done +/- 15k miles since a total rebuild=0Aby Overdrive Spar=
es here in UK.=0A =09* The OD had issues before Christmas (21) and was s=
orted out by OD=0ASpares. The accumulator was uprated and pressure issue=
s sorted.=0A =09* OD functioned 100% on the few times I=E2=80=99d been a=
ble 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 delve=
d a bit deeper.=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 dec=
ided that the operating valve=E2=80=99s adjustment might be off=0Aso..=
=0A =09* I bought 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* Pr=
ior to using the gauge I decided to see if the OD was=0Afunctioning at a=
ll so I raised the car on stands and fitted my=0Apressure gauge.=0A =09*=
I get a reading of 500psi rising a bit when I rev the engine but=0AI=E2=
=80=99d suppose 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 o=
n the RHS up and 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 500psi even when the engine is off. Moving=0Athe lever 20 time=
s has zero effect. 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 pressure 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 expec=
t =E2=80=93 but repeating the pressure gauge=0Aprocess only returns the=
same results.=0A =09* I see in the bible according to Norman Nock that=
=E2=80=9CHolding this=0Alever with your thumb and index finger, you sho=
uld be able to push the=0Alever down lightly about =E2=85=9C=E2=80=9D un=
til 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=0Amove=
ment up & down in that lever. Well, my lever does move and does=0Alift t=
he ball, but there=E2=80=99s not =E2=85=9D=E2=80=9D movement there. Coul=
d that be=0Athe problem area???=0A =09* Almost finished=E2=80=A6keep rea=
ding!=0A=0A=09So, I=E2=80=99m stumped. Every time I learn something new=
about the OD, 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=0Astu=
ck there or whether it=E2=80=99s simply not going into OD at all. =0A=0A=
=09I=E2=80=99ve done a lot of reading through my books and collection of=
=0Aadvice from the various gurus and found reference to ODs being stuck=
=0Abut those seemed to be to do with =E2=80=9Cweak springs=E2=80=9D whic=
h,=0Aparticularly after a long lay-off, wouldn=E2=80=99t disengage. The=
cure for=0Athis being a good smack on the steel plate sandwiched in the=
OD from=0Abelow. Well, that seems to be a stuck mechanism issue whereas=
I=E2=80=99m=0Afacing 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 to the accumulator. The name suggested that pressure=0Am=
ight be stuck in that area=E2=80=A6.but surely not overnight? =0A=0A=09A=
ny ideas? I am particularly reluctant to take the gearbox and OD=0Aout.=
You=E2=80=99ll recall the ridiculous business of the defective clutch=
=0Akit? Well, I forget 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=99m hoping for a miracle of course but some sound advi=
ce would be a=0Agodsend=E2=80=A6=E2=80=A6=E2=80=A6=E2=80=A6 =0A=0A=09Tha=
nks, =0A=0A=09Simon =0A=0A=09
--=_e59c100ef7299043fcaeef091445e7f7
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<html><body>One other thing you could do before having to yank out the u=
nit. Drain the oil, remove the operating valve, and the relief val=
ve, and blow some air from the plug fitting using a rubber tipped blow g=
un, throughout the unit. It may make an oil mess, but not as much=
a mess as having to pull the transmission. This might possibly dislodge=
any debris blockage in the passages. If you reuse the same oil, strain=
it thru a good sieve and look for debris.<div><br></div><div>Then be es=
pecially careful when refilling the gearbox and OD as to not get any dir=
t into the opening. Be sure to check the screen and clean it with=
kerosene (paraffin) upon assembly. Hank<br><br><div class=3D"repl=
y-new-signature"></div><p>-----------------------------------------</p>F=
rom: gradea1@charter.net<br>To: "simon.lachlan@alexarevel.plus.com"<br>C=
c: <br>Sent: Saturday April 16 2022 12:12:34PM<br>Subject: RE: [Healeys]=
Overdrive pressure not releasing.<br><br>=0AHi Simon- I'm sure yo=
u read and re-read the chapter G pg. 5=0Aparagraphs in the service manua=
l. The fact that you have 500lbs of=0Apressure is good, but then the not=
ation of the pressure not=0Areleasing, indicates some kind of blockage i=
n the oil passages that=0Awill not let the pressure drain.=0A<div><br></=
div>=0A<div>Of course, dirt is the most common culprit. That is also why=
=0Athe book suggests lintless rags...the smallest amount of debris can=
=0Aplug up these tiny drillings and prevent pressure from draining.=0AOn=
e rebuilder I discuss these finicky ODs with, suggests enlarging=0Athe d=
rain hole in the operating valve body to 1mm. The other key=0Aitem to ch=
eck is the two relief valve springs (ill. 16 & 56 on=0Aplate G2).&nb=
sp; If reversed they will cause havoc with the=0Apressure drain. If the=
accumulator is stuck-not moving-it will hold=0Athe pressure as it must=
move past a small drilling in the body to=0Arelease it. That is a physi=
cal issue with the O-rings, or piston=0Arings in that bore.</div>=0A<div=
><br></div>=0A<div>Actually, removing the plug from the operating valve=
with 500=0Albs of pressure should have shot out the spring, ball and=0A=
shaft. Since it dribbled out, the blockage must be further=0Adown=
the pike. Operating the lever multiple times before removing=0Athe plug=
is to meant release that pressure.</div>=0A<div><br></div>=0A<div>If it=
has 500 lbs. of pressure, it is in OD! That pressure=0Apushes the two p=
istons (#11) toward the front of the trans=0Acompressing the 8 clutch sp=
rings and placing the clutch facing into=0Acontact with the sun gear.</d=
iv>=0A<div><br></div>=0A<div>Trusting that OD spares properly reassemble=
d the unit would be=0Amost logical, but maybe not. I think the ans=
wer is still with=0Athem, and unfortunately you would have to bring them=
the unit (5th=0Apull!) The problem does not appear to be electrics/adju=
stment=0Arelated. Regards, Hank<br><br><div class=3D"reply-new-signature=
"></div>=0A<p>-----------------------------------------</p>=0AFrom: "Sim=
on Lachlan via Healeys"<br>=0ATo: "Healeys"<br>=0ACc:<br>=0ASent: Saturd=
ay April 16 2022 10:20:09AM<br>=0ASubject: [Healeys] Overdrive pressure=
not releasing.<br><br><div class=3D"WordSection1">=0A<p class=3D"MsoNor=
mal">My OD is driving me mad and I definitely need=0Asome inspired advic=
e. A bit of background first. I=E2=80=99ll try to lay=0Aout all the fact=
s in a logical sequence. (I=E2=80=99m increasingly=0Areluctant to link O=
Ds with logic!)</p>=0A<ol style=3D"margin-top:0cm;" start=3D"1" type=3D"=
1"><li class=3D"MsoListParagraph" style=3D"margin-left:0cm;">I=E2=80=99d=
say that=0Athe OD has done +/- 15k miles since a total rebuild by Overd=
rive=0ASpares here in UK.</li>=0A<li class=3D"MsoListParagraph" style=3D=
"margin-left:0cm;">The OD had=0Aissues before Christmas (21) and was sor=
ted out by OD Spares. The=0Aaccumulator was uprated and pressure issues=
sorted.</li>=0A<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;=
">OD functioned=0A100% on the few times I=E2=80=99d been able to take it=
out since then=0Auntil..</li>=0A<li class=3D"MsoListParagraph" style=3D=
"margin-left:0cm;">One day, the=0AOD stopped functioning.</li>=0A<li cla=
ss=3D"MsoListParagraph" style=3D"margin-left:0cm;">I checked the=0Aelect=
rics. All fine there so I delved a bit deeper.</li>=0A<li class=3D"MsoLi=
stParagraph" style=3D"margin-left:0cm;">It had fried=0Aits solenoid whic=
h I replaced. But=E2=80=A6</li>=0A<li class=3D"MsoListParagraph" style=
=3D"margin-left:0cm;">That did not=0Afix the problem so=E2=80=A6</li>=0A=
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;">I decided=0Ath=
at the operating valve=E2=80=99s adjustment might be off so..</li>=0A<li=
class=3D"MsoListParagraph" style=3D"margin-left:0cm;">I bought a=0Adial=
gauge and hoped to sort it out precisely rather than by=0A=E2=80=9Cfeel=
=E2=80=9D, which I lack in this area.</li>=0A<li class=3D"MsoListParagra=
ph" style=3D"margin-left:0cm;">Prior to=0Ausing the gauge I decided to s=
ee if the OD was functioning at all=0Aso I raised the car on stands and=
fitted my pressure gauge.</li>=0A<li class=3D"MsoListParagraph" style=
=3D"margin-left:0cm;">I get a=0Areading of 500psi rising a bit when I re=
v the engine but I=E2=80=99d=0Asuppose that would drop when the oil warm=
s up.</li>=0A<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;">B=
UT, and this=0Ais where things go pear-shaped=E2=80=A6moving the little=
lever on the RHS=0Aup and down does not engage/disengage OD. There is n=
o change on the=0Agauge to show OD engaging or disengaging.</li>=0A<li c=
lass=3D"MsoListParagraph" style=3D"margin-left:0cm;">AND, the=0Agauge st=
ays at 500psi even when the engine is off. Moving the lever=0A20 times h=
as zero effect. Stayed at 500 overnight!</li>=0A<li class=3D"MsoListPara=
graph" style=3D"margin-left:0cm;">Of course, I=0Achecked for dirt in the=
operating valve area. None.</li>=0A<li class=3D"MsoListParagraph" style=
=3D"margin-left:0cm;">Likewise, the=0Atiny hole in the =E2=80=9Cvalve=
=E2=80=93 operating=E2=80=9D (the spindle thing which the=0Aball sits o=
n)=E2=80=A6.that=E2=80=99s clear. And surely, the pressure would=0Adimin=
ish overnight if something in that area was partially=0Aobstructed?</li>=
=0A<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;">When I remo=
ve=0Athe pressure valve, there=E2=80=99s a small spillage =E2=80=93 no m=
ore than you=E2=80=99d=0Aexpect =E2=80=93 but repeating the pressure gau=
ge process only returns the=0Asame results.</li>=0A<li class=3D"MsoListP=
aragraph" style=3D"margin-left:0cm;">I see in the=0Abible according to N=
orman Nock that =E2=80=9CHolding this lever with your=0Athumb and index=
finger, you should be able to push the lever down=0Alightly about =E2=
=85=9C=E2=80=9D until you feel a slight spring pressure=0Aresistance. Th=
e lever should go down another =C2=BC=E2=80=9D after encountering=0Athe=
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=0Alever. Well, my lever does=
move and does lift the ball, but there=E2=80=99s=0Anot =E2=85=9D=E2=80=
=9D movement there. Could that be the problem area???</li>=0A<li class=
=3D"MsoListParagraph" style=3D"margin-left:0cm;">Almost=0Afinished=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 abou=
t 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=0Away of 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 throug=
h my books and collection of advice from the various=0Agurus and found r=
eference to ODs being stuck but those seemed to be=0Ato do with =E2=80=
=9Cweak springs=E2=80=9D which, particularly after a long lay-off,=0Awou=
ldn=E2=80=99t disengage. The cure for this being a good smack on the=0As=
teel plate sandwiched in the OD from below. Well, that seems to be=0Aa s=
tuck mechanism issue whereas I=E2=80=99m facing a hydraulic conundrum.=
=0AOr am I?</p>=0A<p class=3D"MsoNormal" style=3D"margin-left:18pt;">The=
re is what is=0Ausually referred to as the =E2=80=9Cpressure relief valv=
e=E2=80=9D adjacent to the=0Aaccumulator. The name suggested that pressu=
re might be stuck in=0Athat area=E2=80=A6.but surely not overnight?</p>=
=0A<p class=3D"MsoNormal" style=3D"margin-left:18pt;"> </p>=0A<p cl=
ass=3D"MsoNormal" style=3D"margin-left:18pt;">Any ideas? I am=0Aparticul=
arly reluctant to take the gearbox and OD out. You=E2=80=99ll=0Arecall t=
he ridiculous business of the defective clutch kit? Well, I=0Aforget whe=
ther 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"MsoNorma=
l" style=3D"margin-left: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 would be a godsend=E2=80=A6=E2=80=A6=E2=80=A6=E2=80=
=A6</p>=0A<p class=3D"MsoNormal" style=3D"margin-left:18pt;"> </p>=
=0A<p class=3D"MsoNormal" style=3D"margin-left:18pt;">Thanks,</p>=0A<p c=
lass=3D"MsoNormal" style=3D"margin-left:18pt;">Simon</p>=0A<p class=3D"M=
soNormal" style=3D"margin-left:18pt;"> </p>=0A</div>=0A</div>=0A</d=
iv></body></html>
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