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OD Pressure should be much higher-could be 600 PSI. As I previously=0Ast=
ated, 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 pressure will not be there. Too large=0Aor=
small a ball will not seat in the valve chamber. Also, if replacing=0Aw=
ith a new ball and spring, take a brass drift and "seat" the ball in=0Ai=
ts position. What is the condition of the piston rings and O=0Arings...t=
hey must be up to the task as well for them to hold that huge=0Apressure=
. Use sealant on all gaskets and in addition the brake ring=0Aseal to ea=
ch side of the case (ignore the passage in the workshop book=0Athat says=
no sealant there-just be careful when applying it). Hank=0A=0A=09------=
-----------------------------------From: 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 tes=
ted the OD at the operating valve plug =E2=80=93 370 PSI=0Aat 1,000 RPM=
in 4th. Drops to about 340 PSI when I attempt to engage=0Athe OD. OD di=
d 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=09 Held 150 PSI for ab=
out 20 minutes after being shut off and then took=0Aabout 2 hours to dro=
p below 100 PSI. At least I now have a better=0Aunderstanding of why the=
se things leak so badly. Who in their right=0Amind would design somethin=
g 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 the Team.Net Tech site. =0A[1]http://www.team.net/www/h=
ealey/tech/big_hly/od/delborder_od.html=0A[2]=0A=0A=09Next step is to ch=
eck 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 putting a washer on the=0Aback side of the head of the=
plunger? =0A=0A=09If the stem length/ insertion length into spring is t=
hat important,=0Acouldn=E2=80=99t I could add length to that at home wit=
h 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 f=
or proper operation, the pressure should be at 470 to 490=0Apsi.=0A=0A=
=09Now, finally... the OD low oil pressure cause and fix. A fatigued=0As=
pring in the non-return 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 can 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 pressurized accumulating chamber, =0A=0A=09 =0A=0ALink=
s:=0A------=0A[1] http://www.team.net/www/healey/tech/big_hly/od/delbord=
er_od.html=0A[2] http://www.team.net/www/healey/tech/big_hly/od/delborde=
r_od.html=0A
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<html><body>OD Pressure should be much higher-could be 600 PSI. As I pre=
viously stated, be sure that the ball in the operating valve is the corr=
ect size- 1/4" OD in pump valve. The upper valve uses a 5/16" OD ball an=
d you 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=
with a new ball and spring, take a brass drift and "seat" the ball in i=
ts position. What is the condition of the piston rings and O rings...the=
y must be up to the task as well for them to hold that huge pressure. Us=
e sealant on all gaskets and in addition the brake ring seal to each sid=
e of the case (ignore the passage in the workshop book that says no seal=
ant there-just be careful when applying it). Hank<br><br><div class=3D"r=
eply-new-signature"></div><p>-----------------------------------------</=
p>From: jpaynepbr@cox.net<br>To: healeys@autox.team.net<br>Cc: <br>Sent:=
Saturday May 23 2020 5:36:24PM<br>Subject: [Healeys] Overdrive non retu=
rn valve Question<br><br><meta http-equiv=3D"Content-Type" content=3D"te=
xt/html; charset=3Dus-ascii"><meta name=3D"Generator" content=3D"Microso=
ft Word 15 (filtered medium)"><!--[if !mso]><style>v\:* {behavior:url(#d=
efault#VML);}=0Ao\:* {behavior:url(#default#VML);}=0Aw\:* {behavior:url(=
#default#VML);}=0A.shape {behavior:url(#default#VML);}=0A</style><![endi=
f]--><style><!--=0A/* Font Definitions */=0A@font-face=0A=09{font-family=
:"Cambria Math";=0A=09panose-1:2 4 5 3 5 4 6 3 2 4;}=0A@font-face=0A=09{=
font-family:Calibri;=0A=09panose-1:2 15 5 2 2 2 4 3 2 4;}=0A/* Style Def=
initions */=0Ap.MsoNormal, li.MsoNormal, div.MsoNormal=0A=09{margin:0in;=
=0A=09margin-bottom:.0001pt;=0A=09font-size:11.0pt;=0A=09font-family:"Ca=
libri",sans-serif;}=0Aa:link, span.MsoHyperlink=0A=09{mso-style-priority=
:99;=0A=09color:#0563C1;=0A=09text-decoration:underline;}=0Aspan.EmailSt=
yle17=0A=09{mso-style-type:personal-compose;=0A=09font-family:"Calibri",=
sans-serif;=0A=09color:windowtext;}=0A.MsoChpDefault=0A=09{mso-style-typ=
e:export-only;=0A=09font-family:"Calibri",sans-serif;}=0A@page WordSecti=
on1=0A=09{size:8.5in 11.0in;=0A=09margin:1.0in 1.0in 1.0in 1.0in;}=0Adiv=
.WordSection1=0A=09{page:WordSection1;}=0A--></style><!--[if gte mso 9]>=
<xml>=0A<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" />=0A</xml><![e=
ndif]--><!--[if gte mso 9]><xml>=0A<o:shapelayout v:ext=3D"edit">=0A<o:i=
dmap v:ext=3D"edit" data=3D"1" />=0A</o:shapelayout></xml><![endif]--><d=
iv class=3D"WordSection1"><p class=3D"MsoNormal" style=3D"mso-margin-top=
-alt:auto;mso-margin-bottom-alt:auto"><span style=3D"font-size:12.0pt;fo=
nt-family:"Times New Roman",serif">So I pressure tested the OD=
at the operating valve plug =E2=80=93 370 PSI at 1,000 RPM in 4<sup>th<=
/sup>. Drops to about 340 PSI when I attempt to engage the O=
D. OD did not engage.<o:p></o:p></span></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">This is w=
ith the back end on jack stands (not the recalled ones!), so it is under=
no load.<o:p></o:p></span></p><p class=3D"MsoNormal" style=3D"mso-margi=
n-top-alt:auto;mso-margin-bottom-alt:auto"><span style=3D"font-size:12.0=
pt;font-family:"Times New Roman",serif"> Held 150 PSI for abou=
t 20 minutes after being shut off and then took about 2 hours to drop be=
low 100 PSI. At least I now have a better understanding of why the=
se things leak so badly. Who in their right mind would design some=
thing to hold that sort of residual oil pressure?<o:p></o:p></span></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 R=
oman",serif">Based on all the reading, pressure is too low, but not=
hing appears way off?<o:p></o:p></span></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">I=E2=80=
=99m using the Team.Net Tech site. <a href=3D"http://w=
ww.team.net/www/healey/tech/big_hly/od/delborder_od.html"></a><a href=3D=
"http://www.team.net/www/healey/tech/big_hly/od/delborder_od.html"; targe=
t=3D"_blank">http://www.team.net/www/healey/tech/big_hly/od/delborder_od=
.html</a><o:p></o:p></span></p><p class=3D"MsoNormal" style=3D"mso-margi=
n-top-alt:auto;mso-margin-bottom-alt:auto"><span style=3D"font-size:12.0=
pt;font-family:"Times New Roman",serif"><o:p> </o:p></spa=
n></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:"Time=
s New Roman",serif">Next step is to check the non return valve spri=
ng. <o:p></o:p></span></p><p class=3D"MsoNormal" style=3D"mso-margin-top=
-alt:auto;mso-margin-bottom-alt:auto"><span style=3D"font-size:12.0pt;fo=
nt-family:"Times New Roman",serif"> Question, why would I=
take it to a machinist to add .084=E2=80=9D to the head of the little p=
lunger instead of just putting a washer on the back side of the head of=
the plunger? <o:p></o:p></span></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">If the st=
em length/ insertion length into spring is that important, couldn=E2=80=
=99t I could add length to that at home with my mig welder and file it s=
o that the spring moves freely and doesn=E2=80=99t hang up? <o:p><=
/o:p></span></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">From the team.net site :<o:p></o:p></=
span></p><p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-mar=
gin-bottom-alt:auto"><span style=3D"font-size:12.0pt;font-family:"T=
imes New Roman",serif">psi, but for proper operation, the pressure=
should be at 470 to 490 psi.<o:p></o:p></span></p><p class=3D"MsoNormal=
"><span style=3D"font-size:12.0pt;font-family:"Times New Roman"=
;,serif">Now, finally... the OD low oil pressure cause and fix. A <u>fat=
igued spring in the non-return valve portion of the OD</u> (see Fig. 6.1=
9). What? Is that it? You must be kidding - I waited two months for this=
? Yes, it does seem sort of anti-climactic, but this spring can cause ma=
jor frustration. Springs are like people - as they age, they get shorter=
and weaker. As you can see in Fig. 6.19, the spring pushes against a ba=
ll 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><img border=3D"0" wid=
th=3D"374" height=3D"356" style=3D"width:3.8956in;height:3.713in" id=3D"=
Picture_x0020_5" src=3D"/index.php/inbox/attachment/filenameOriginal/ima=
ge003.png/filenamefs/INBOX3951225aeff6e015162aeb316983d8bd61558" alt=3D"=
rework of the OD hydraulic pump valve"><o:p></o:p></p><p class=3D"MsoNor=
mal"><o:p> </o:p></p><p class=3D"MsoNormal"><o:p> </o:p></p></=
div></body></html>
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