<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 pump 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 pressure. 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 problem 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 replaced the ball with the correct size and pressure returned. I just assembled an overdrive for a 100, but don't remember which is which-I did remember 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="reply-new-signature"></div><p>-----------------------------------------</p>From: "Bob Spidell" <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>
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I believe it's 5/16"; hopefully others can confirm. Same size as
the ball in the OD activating valve and the bearings in the seat
slides; I bought a bag of them for spares.<br>
<br>
Bob<br>
<br>
<div class="moz-cite-prefix">On 5/14/2020 4:52 PM, Warren wrote:<br>
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<p class="MsoNormal">Would anyone know the size of the ball
bearing on the pump non return valve and where I might get one
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<p class="MsoNormal">locally? Yes, I lost it as I was inspecting
for dirt or wear. The last thing I wanted to check and clean
while I had access before I started to reassemble with new
accumulator,piston and spring.</p>
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<p class="MsoNormal">Thanks,</p>
<p class="MsoNormal">WD 67 BJ8</p>
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<p class="MsoNormal">Sent from <a href="https://go.microsoft.com/fwlink/?LinkId=550986" moz-do-not-send="true">Mail</a> for Windows 10</p>
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