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Overdrive engagement is controlled by having enough pressure to=0Aoverco=
me the 8 springs keeping the clutch from engaging the annulus.=0A(Direct=
drive). There has to be sufficient pressure to keep the clutch=0Aattach=
ed to the annulus ring. (Overdrive position) This requires about=0A600lb=
s. Steady pressure from the pump.=0AI would sit down with the Moss catal=
og and make a list of all the=0Apressure parts and get new ones. Shoving=
washers in place is a make do=0Aand may not last long under road loads.=
=0AAfter you get a parts list, contact Overdrive Spares, UK and buy them=
=0Afrom this company. They are the original engineers of Laycock and kno=
w=0Awhat you need to make good pressure. Best regards, Hank=0A=0A=09----=
-------------------------------------From: jpaynepbr@cox.net=0ATo: grade=
a1@charter.net=0ACc: healeys@autox.team.net=0ASent: Sunday May 24 2020 7=
:21:56PM=0ASubject: RE: [Healeys] Overdrive non return valve Question=0A=
=0A=09Shimmed the spring on the pump check valve by .08=E2=80=9D. =0A=0A=
=09Shope let me borrow an accumulator spring that was 3/64=E2=80=9D long=
er.=0A=0A=09Up to over 450+ psi now. OD will engage with the rear jacked=
up, but=0Anot while driving. On jack stands, when OD is engaged, drops=
to +/-=0A410 psi then quickly comes back up to 450+.=0A=0A=09Did not ch=
ange out accumulator piston/rings/sleeve or O-Rings yet,=0Awas hoping to=
avoid that.=0A=0A=09Thinking about trying a 1/16=E2=80=9D washer to shi=
m the accumulator spring=0Aor is it a lost cause? =0A=0A=09FROM: gradea1=
@charter.net =0ASENT: Sunday, May 24, 2020 10:26 AM=0ATO: 'jpaynepbr@co=
x.net' =0ACC: 'healeys@autox.team.net' =0ASUBJECT: RE: [Healeys] Overdri=
ve non return valve Question=0A=0A=09OD Pressure should be much higher-c=
ould be 600 PSI. As I previously=0Astated, be sure that the ball in the=
operating valve is the correct=0Asize- 1/4" OD in pump valve. The upper=
valve uses a 5/16" OD ball and=0Ayou cannot mix them up, our your press=
ure will not be there. Too large=0Aor small a ball will not seat in the=
valve chamber. Also, if replacing=0Awith a new ball and spring, take a=
brass drift and "seat" the ball in=0Aits position. What is the conditio=
n of the piston rings and O=0Arings...they must be up to the task as wel=
l for them to hold that huge=0Apressure. Use sealant on all gaskets and=
in addition the brake ring=0Aseal to each side of the case (ignore the=
passage in the workshop book=0Athat says no sealant there-just be caref=
ul when applying it). Hank=0A=0A=09-------------------------------------=
----=0A=0A=09From: jpaynepbr@cox.net=0ATo: healeys@autox.team.net=0ACc:=
=0ASent: Saturday May 23 2020 5:36:24PM=0ASubject: [Healeys] Overdrive=
non return valve Question=0A=0A=09So I pressure tested the OD at the op=
erating valve plug =E2=80=93 370 PSI=0Aat 1,000 RPM in 4th. Drops to abo=
ut 340 PSI when I attempt to engage=0Athe OD. OD did not engage.=0A=0A=
=09This is with the back end on jack stands (not the recalled ones!), so=
=0Ait is under no load.=0A=0A=09Held 150 PSI for about 20 minutes after=
being shut off and then took=0Aabout 2 hours to drop below 100 PSI. At=
least I now have a better=0Aunderstanding of why these things leak so b=
adly. Who in their right=0Amind would design something to hold that sort=
of residual oil=0Apressure?=0A=0A=09Based on all the reading, pressure=
is too low, but nothing appears=0Away off?=0A=0A=09I=E2=80=99m using th=
e Team.Net Tech site. =0A[1]http://www.team.net/www/healey/tech/big_hly/=
od/delborder_od.html=0A[2]=0A=0A=09Next step is to check the non return=
valve spring. =0A=0A=09 Question, why would I take it to a machinist to=
add .084=E2=80=9D to the=0Ahead of the little plunger instead of just p=
utting a washer on the=0Aback side of the head of the plunger? =0A=0A=09=
If the stem length/ insertion length into spring is that important,=0Aco=
uldn=E2=80=99t I could add length to that at home with my mig welder and=
=0Afile it so that the spring moves freely and doesn=E2=80=99t hang up?=
=0A=0A=09From the team.net site :=0A=0A=09psi, but for proper operation=
, the pressure should be at 470 to 490=0Apsi.=0A=0A=09Now, finally... th=
e OD low oil pressure cause and fix. A fatigued=0Aspring in the non-retu=
rn valve portion of the OD (see Fig. 6.19).=0AWhat? Is that it? You must=
be kidding - I waited two months for this?=0AYes, it does seem sort of=
anti-climactic, but this spring can cause=0Amajor frustration. Springs=
are like people - as they age, they get=0Ashorter and weaker. As you ca=
n see in Fig. 6.19, the spring pushes=0Aagainst a ball and plunger. The=
purpose of this spring is to allow the=0Aball to lift from its seat at=
each power stroke of the OD pump,=0Aallowing oil to flow into the press=
urized accumulating chamber, =0A=0A=09 =0A=0ALinks:=0A------=0A[1] http:=
//www.team.net/www/healey/tech/big_hly/od/delborder_od.html=0A[2] http:/=
/www.team.net/www/healey/tech/big_hly/od/delborder_od.html=0A
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<html><body>Overdrive engagement is controlled by having enough pressure=
to overcome the 8 springs keeping the clutch from engaging the annulus.=
(Direct drive). There has to be sufficient pressure to keep the c=
lutch attached to the annulus ring. (Overdrive position) This requires a=
bout 600lbs. Steady pressure from the pump.<div><br></div><div>I would s=
it down with the Moss catalog and make a list of all the pressure parts=
and get new ones. Shoving washers in place is a make do and may not las=
t long under road loads.</div><div><br></div><div>After you get a parts=
list, contact Overdrive Spares, UK and buy them from this company. They=
are the original engineers of Laycock and know what you need to make go=
od pressure. Best regards, Hank</div><div><br><div class=3D"reply-=
new-signature"></div><p>-----------------------------------------</p>Fro=
m: jpaynepbr@cox.net<br>To: gradea1@charter.net<br>Cc: healeys@autox.tea=
m.net<br>Sent: Sunday May 24 2020 7:21:56PM<br>Subject: RE: [Healeys] Ov=
erdrive non return valve Question<br><br><meta http-equiv=3D"Content-Typ=
e" content=3D"text/html; charset=3Dutf-8"><meta name=3D"Generator" conte=
nt=3D"Microsoft Word 15 (filtered medium)"><!--[if !mso]><style>v\:* {be=
havior:url(#default#VML);}=0Ao\:* {behavior:url(#default#VML);}=0Aw\:* {=
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ly:"Calibri",sans-serif;=0A=09color:windowtext;}=0A.MsoChpDefault=0A=09{=
mso-style-type:export-only;=0A=09font-size:10.0pt;}=0A@page WordSection1=
=0A=09{size:8.5in 11.0in;=0A=09margin:1.0in 1.0in 1.0in 1.0in;}=0Adiv.Wo=
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l>=0A<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" />=0A</xml><![endi=
f]--><!--[if gte mso 9]><xml>=0A<o:shapelayout v:ext=3D"edit">=0A<o:idma=
p v:ext=3D"edit" data=3D"1" />=0A</o:shapelayout></xml><![endif]--><div=
class=3D"WordSection1"><p class=3D"MsoNormal">Shimmed the spring on the=
pump check valve by .08=E2=80=9D. <o:p></o:p></p><p class=3D"MsoN=
ormal"><o:p> </o:p></p><p class=3D"MsoNormal">Shope let me borrow a=
n accumulator spring that was 3/64=E2=80=9D longer.<o:p></o:p></p><p cla=
ss=3D"MsoNormal"><o:p> </o:p></p><p class=3D"MsoNormal">Up to over=
450+ psi now. OD will engage with the rear jacked up, but not whi=
le driving. On jack stands, when OD is engaged, drops to +/- 410 p=
si then quickly comes back up to 450+.<o:p></o:p></p><p class=3D"MsoNorm=
al"><o:p> </o:p></p><p class=3D"MsoNormal">Did not change out accum=
ulator piston/rings/sleeve or O-Rings yet, was hoping to avoid that.<o:p=
></o:p></p><p class=3D"MsoNormal"><o:p> </o:p></p><p class=3D"MsoNo=
rmal">Thinking about trying a 1/16=E2=80=9D washer to shim the accumulat=
or spring or is it a lost cause? <o:p></o:p></p><p class=3D"MsoNor=
mal"><o:p> </o:p></p><p class=3D"MsoNormal"><o:p> </o:p></p><p=
class=3D"MsoNormal"><o:p> </o:p></p><div><div style=3D"border:none=
;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in"><p class=3D"M=
soNormal"><b>From:</b> gradea1@charter.net <gradea1@charter.net> <=
br><b>Sent:</b> Sunday, May 24, 2020 10:26 AM<br><b>To:</b> 'jpaynepbr@c=
ox.net' <jpaynepbr@cox.net><br><b>Cc:</b> 'healeys@autox.team.net'=
<healeys@autox.team.net><br><b>Subject:</b> RE: [Healeys] Overdri=
ve non return valve Question<o:p></o:p></p></div></div><p class=3D"MsoNo=
rmal"><o:p> </o:p></p><p class=3D"MsoNormal" style=3D"margin-bottom=
:12.0pt">OD Pressure should be much higher-could be 600 PSI. As I previo=
usly stated, be sure that the ball in the operating valve is the correct=
size- 1/4" OD in pump valve. The upper valve uses a 5/16" OD ball and y=
ou cannot mix them up, our your pressure will not be there. Too large or=
small a ball will not seat in the valve chamber. Also, if replacing wit=
h a new ball and spring, take a brass drift and "seat" the ball in its p=
osition. What is the condition of the piston rings and O rings...they mu=
st be up to the task as well for them to hold that huge pressure. Use se=
alant on all gaskets and in addition the brake ring seal to each side of=
the case (ignore the passage in the workshop book that says no sealant=
there-just be careful when applying it). Hank<o:p></o:p></p><p>--------=
---------------------------------<o:p></o:p></p><p class=3D"MsoNormal">F=
rom: jpaynepbr@cox.net<br>To: healeys@autox.team.net<br>Cc: <br>Sent: Sa=
turday May 23 2020 5:36:24PM<br>Subject: [Healeys] Overdrive non return=
valve Question<br><br><br><o:p></o:p></p><p class=3D"MsoNormal" style=
=3D"mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style=3D"f=
ont-size:12.0pt;font-family:"Times New Roman",serif">So I pres=
sure tested the OD at the operating valve plug =E2=80=93 370 PSI at 1,00=
0 RPM in 4<sup>th</sup>. Drops to about 340 PSI when I attem=
pt to engage the OD. OD did not engage.</span><o:p></o:p></p><p class=3D=
"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"=
><span style=3D"font-size:12.0pt;font-family:"Times New Roman"=
,serif">This is with the back end on jack stands (not the recalled ones!=
), so it is under no load.</span><o:p></o:p></p><p class=3D"MsoNormal" s=
tyle=3D"mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style=
=3D"font-size:12.0pt;font-family:"Times New Roman",serif">Held=
150 PSI for about 20 minutes after being shut off and then took about 2=
hours to drop below 100 PSI. At least I now have a better underst=
anding of why these things leak so badly. Who in their right mind=
would design something to hold that sort of residual oil pressure?</spa=
n><o:p></o:p></p><p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto=
;mso-margin-bottom-alt:auto"><span style=3D"font-size:12.0pt;font-family=
:"Times New Roman",serif">Based on all the reading, pressure i=
s too low, but nothing appears way off?</span><o:p></o:p></p><p class=3D=
"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"=
><span style=3D"font-size:12.0pt;font-family:"Times New Roman"=
,serif">I=E2=80=99m using the Team.Net Tech site. <a h=
ref=3D"http://www.team.net/www/healey/tech/big_hly/od/delborder_od.html"=
target=3D"_blank"></a><a href=3D"http://www.team.net/www/healey/tech/bi=
g_hly/od/delborder_od.html" target=3D"_blank">http://www.team.net/www/he=
aley/tech/big_hly/od/delborder_od.html</a></span><o:p></o:p></p><p class=
=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-alt:au=
to"><span style=3D"font-size:12.0pt;font-family:"Times New Roman&qu=
ot;,serif"> </span><o:p></o:p></p><p class=3D"MsoNormal" style=3D"m=
so-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style=3D"font-s=
ize:12.0pt;font-family:"Times New Roman",serif">Next step is t=
o check the non return valve spring. </span><o:p></o:p></p><p class=3D"M=
soNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><=
span style=3D"font-size:12.0pt;font-family:"Times New Roman",s=
erif"> Question, why would I take it to a machinist to add .084=E2=
=80=9D to the head of the little plunger instead of just putting a washe=
r on the back side of the head of the plunger? </span><o:p></o:p><=
/p><p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bo=
ttom-alt:auto"><span style=3D"font-size:12.0pt;font-family:"Times N=
ew Roman",serif">If the stem length/ insertion length into spring i=
s that important, couldn=E2=80=99t I could add length to that at home wi=
th my mig welder and file it so that the spring moves freely and doesn=
=E2=80=99t hang up? </span><o:p></o:p></p><p class=3D"MsoNormal" s=
tyle=3D"mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style=
=3D"font-size:12.0pt;font-family:"Times New Roman",serif">From=
the team.net site :</span><o:p></o:p></p><p class=3D"MsoNormal" style=
=3D"mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style=3D"f=
ont-size:12.0pt;font-family:"Times New Roman",serif">psi, but=
for proper operation, the pressure should be at 470 to 490 psi.</span><=
o:p></o:p></p><p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;fon=
t-family:"Times New Roman",serif">Now, finally... the OD low o=
il pressure cause and fix. A <u>fatigued spring in the non-return valve=
portion of the OD</u> (see Fig. 6.19). What? Is that it? You must be ki=
dding - I waited two months for this? Yes, it does seem sort of anti-cli=
mactic, but this spring can cause major frustration. Springs are like pe=
ople - as they age, they get shorter and weaker. As you can see in Fig.=
6.19, the spring pushes against a ball and plunger. The purpose of this=
spring is to allow the ball to lift from its seat at each power stroke=
of the OD pump, allowing oil to flow into the pressurized accumulating=
chamber, </span><span style=3D"border:solid windowtext 1.0pt;padding:0i=
n"><img border=3D"0" width=3D"374" height=3D"356" style=3D"width:3.8956i=
n;height:3.7043in" id=3D"Picture_x0020_5" src=3D"/index.php/inbox/attach=
ment/filenameOriginal/image002.jpg/filenamefs/INBOX39542f6fa556f6a759f3f=
d573282b521e9f7b" alt=3D"Image removed by sender. rework of the OD hydra=
ulic pump valve"></span><o:p></o:p></p><p class=3D"MsoNormal"> <o:p=
></o:p></p><p class=3D"MsoNormal"> <o:p></o:p></p></div></div></bod=
y></html>
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