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Be careful here! There are two check ball valves and springs in the=0AOD=
. The upper operating valve ball is different than the pump valve.=0ABob=
is correct on one size-but one is 5/16" but the other is 1/4"...if=0Ayo=
u reverse them you won't get overdrive pressure. I have the part=0Anumbe=
rs for each from the parts book, but that does not indicate the=0Asizes.=
=0AFrom the problem my friend had with no pressure at the pump valve, I'=
m=0Athinking the 1/4" belongs there and the 5/16" is in the upper=0Aoper=
ating valve. He replaced the ball with the correct size and=0Apressure r=
eturned. I just assembled an overdrive for a 100, but don't=0Aremember w=
hich is which-I did remember not to mix them up. Check the=0Abore size t=
o be sure if you do mix them while assembling. I'll recheck=0Athe Sept.=
1954 parts book to see if a size is mentioned for each. Hank=0A=0A=09--=
---------------------------------------From: "Bob Spidell" =0ATo: healey=
s@autox.team.net=0ACc: =0ASent: Thursday May 14 2020 8:48:13PM=0ASubject=
: Re: [Healeys] OD check ball=0A=0A I believe it's 5/16"; hopefully oth=
ers can confirm. Same size as the=0Aball in the OD activating valve and=
the bearings in the seat slides; I=0Abought a bag of them for spares.=
=0A=0A Bob=0A=0A On 5/14/2020 4:52 PM, Warren wrote:=0A=0A=09Would anyon=
e know the size of the ball bearing on the pump non return=0Avalve and w=
here I might get one =0A=0A=09locally? Yes, I lost it as I was inspecti=
ng for dirt or wear. The=0Alast thing I wanted to check and clean while=
I had access before I=0Astarted to reassemble with new accumulator,pist=
on and spring. =0A=0A=09Thanks, =0A=0A=09WD 67 BJ8 =0A=0A=09Sent from Ma=
il [1] for Windows 10 =0A=0A =0A=0ALinks:=0A------=0A[1] https://go.micr=
osoft.com/fwlink/?LinkId=3D550986=0A
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<html><body>Be careful here! There are two check ball valves and springs=
in the OD. The upper operating valve ball is different than the p=
ump valve.<div><br></div><div>Bob is correct on one size-but one is 5/16=
" but the other is 1/4"...if you reverse them you won't get overdrive pr=
essure. I have the part numbers for each from the parts book, but=
that does not indicate the sizes.</div><div><br></div><div>From the pro=
blem my friend had with no pressure at the pump valve, I'm thinking the=
1/4" belongs there and the 5/16" is in the upper operating valve. He re=
placed the ball with the correct size and pressure returned. I just asse=
mbled an overdrive for a 100, but don't remember which is which-I did re=
member not to mix them up. Check the bore size to be sure if you do mix=
them while assembling. I'll recheck the Sept. 1954 parts book to see if=
a size is mentioned for each. Hank<br><br><div class=3D"reply-new-signa=
ture"></div><p>-----------------------------------------</p>From: "Bob S=
pidell" <bspidell@comcast.net><br>To: healeys@autox.team.net<br>Cc: <br>=
Sent: Thursday May 14 2020 8:48:13PM<br>Subject: Re: [Healeys] OD check=
ball<br><br>=0A <meta http-equiv=3D"Content-Type" content=3D"text/ht=
ml; charset=3DUTF-8">=0A =0A I believe it's 5/16"; hopefully others=
can confirm. Same size as=0A the ball in the OD activating val=
ve and the bearings in the seat=0A slides; I bought a bag of them for=
spares.<br>=0A <br>=0A Bob<br>=0A <br>=0A <div class=3D"moz=
-cite-prefix">On 5/14/2020 4:52 PM, Warren wrote:<br>=0A </div>=0A =
<blockquote type=3D"cite" cite=3D"mid:5ebe0520.1c69fb81.a3246.5fe0@mx.=
google.com">=0A <meta http-equiv=3D"Content-Type" content=3D"text/h=
tml; charset=3DUTF-8">=0A <meta name=3D"Generator" content=3D"Micro=
soft Word 15 (filtered=0A medium)">=0A <style><!--=0A/* Font=
Definitions */=0A@font-face=0A=09{font-family:"Cambria Math";=0A=09pano=
se-1:2 4 5 3 5 4 6 3 2 4;}=0A@font-face=0A=09{font-family:Calibri;=0A=09=
panose-1:2 15 5 2 2 2 4 3 2 4;}=0A/* Style Definitions */=0Ap.MsoNormal,=
li.MsoNormal, div.MsoNormal=0A=09{margin:0in;=0A=09margin-bottom:.0001p=
t;=0A=09font-size:11.0pt;=0A=09font-family:"Calibri",sans-serif;}=0Aa:li=
nk, span.MsoHyperlink=0A=09{mso-style-priority:99;=0A=09color:blue;=0A=
=09text-decoration:underline;}=0A.MsoChpDefault=0A=09{mso-style-type:exp=
ort-only;}=0A@page WordSection1=0A=09{size:8.5in 11.0in;=0A=09margin:1.0=
in 1.0in 1.0in 1.0in;}=0Adiv.WordSection1=0A=09{page:WordSection1;}=0A--=
></style>=0A <div class=3D"WordSection1">=0A <p class=3D"Mso=
Normal">Would anyone know the size of the ball=0A bearing on th=
e pump non return valve and where I might get one=0A </p>=0A =
<p class=3D"MsoNormal">locally? Yes, I lost it as I was inspecting=
=0A for dirt or wear. The last thing I wanted to check and clea=
n=0A while I had access before I started to reassemble with new=
=0A accumulator,piston and spring.</p>=0A <p class=3D"Ms=
oNormal"><o:p> </o:p></p>=0A <p class=3D"MsoNormal">Thanks,<=
/p>=0A <p class=3D"MsoNormal">WD 67 BJ8</p>=0A <p class=3D=
"MsoNormal"><o:p> </o:p></p>=0A <p class=3D"MsoNormal">Sent=
from <a href=3D"https://go.microsoft.com/fwlink/?LinkId=3D550986"; moz-d=
o-not-send=3D"true">Mail</a> for Windows 10</p>=0A <p class=3D"Ms=
oNormal"><o:p> </o:p></p>=0A </div>=0A <br>=0A </block=
quote>=0A <br>=0A </bspidell@comcast.net></div></body></html>
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