<html><body>Simon-great that David helped you with the proper tool. I'm sure he agrees that the fitting of the pump body and ball is critical to get good pressure. (that suggestion from someone to stretch the spring for more contact is a workaround) I think if you use good replacement parts that won't be necessary. With the original unaltered parts you should achieve between 450-500 lbs. which is enough to overcome the springs of the direct drive position.<div><br></div><div>1- Its easier on the bench, but you should be able to get to the pump in position with the unit in the car.</div><div><br></div><div>2- You insert a screwdriver in the channel where the ball goes and "guide" the plunger so that it goes as stated with the flat to the rear and it will fit the guide peg, and the hole will end up exactly facing the channel for the ball, etc. (this may be hard to see in the car as it quite low and you will have to stick your head to the floor!) Be careful not to damage the seat!!! I would use a wood dowel rather than a screwdriver, but if you are careful not to exert pressure and distort the seat then OK. You might need two people to do this-one below to tap the pump home, and one above guiding it.</div><div><br></div><div>The trick is to not damage anything by stressing parts. Most important is, as you say, the plunger must be free to move up and down with the cam action.</div><div><br></div><div>It does appear that the issues you were having were that the plunger was not free to ride up and down with the cam to produce pressure. Whoever glued it in position was not understanding how the overdrive works. Good luck, Hank<br><br><div class="reply-new-signature"></div><p>-----------------------------------------</p>From: simon.lachlan@alexarevel.plus.com<br>To: "David Nock"<br>Cc: "Healeys"<br>Sent: Monday August 30 2021 5:30:17AM<br>Subject: RE: [Healeys] Overdrive pump queries<br><br>
<div class="WordSection1">
<p class="MsoNormal"><span>Hi,</span></p>
<p class="MsoNormal"><span>David
has already steered me in the right direction with regard to the
reamer.</span></p>
<p class="MsoNormal"><span> </span></p>
<p class="MsoNormal"><span>And a
further query…..</span></p>
<p class="MsoNormal"><span>It
seems very likely from what I confront in my car and from the
advice received to date – for which many thanks -..it seems very
likely that the issue is caused by the pump plunger being stuck or,
I suspect, not quite orientated.</span></p>
<p class="MsoNormal"><span>Despite what you guys suspect by
now(!), I study form religiously before I delve into these things
and have been brought up short by a section in the BMC manual,
Section G8, “Pump Valve”. One is told how to put the “pump body”
back in using one of many mythical special tools and then the
manual addresses the insertion of the “plunger” (piston):- “The
pump plunger is prevented from rotation when in position by a guide
peg carried in the front casing. When assembling the pump, the
plunger should be inserted with the flat on its head facing the
rear of the unit. It is possible to guide it past the guide peg by
means of a screwdriver inserted through the side of the
casting”.</span></p>
<ol style="margin-top:0cm;" start="1" type="1"><li class="MsoListParagraph" style="margin-left:0cm;"><span>Can that procedure be carried out when
the OD is still in the car as is implied by the manual?</span></li>
<li class="MsoListParagraph" style="margin-left:0cm;"><span>If so, where is the access point
through which one can insert a screwdriver? (Strikes me that oil
would gush out…..If the pump ever restarted pumping!)</span></li>
<li class="MsoListParagraph" style="margin-left:0cm;"><span>If not so, is there a trick involved
in getting the plunger up and correctly sited?</span></li>
</ol><p class="MsoListParagraph"><span> </span></p>
<p class="MsoListParagraph"><span>Simon</span></p>
<p class="MsoNormal"><span> </span></p>
<p class="MsoNormal"><span> </span></p>
<p class="MsoNormal"><span> </span></p>
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<div style="border:none;border-top:solid #E1E1E1 1pt;padding:3pt 0cm 0cm 0cm;">
<p class="MsoNormal"><b><span lang="en-us">From:</span></b>
<span lang="en-us">Healeys <healeys-bounces@autox.team.net>
<b>On Behalf Of</b> Henry G Leach via Healeys<br><b>Sent:</b> 30 August 2021 01:57<br><b>To:</b> 'David Nock' <healeydoc@sbcglobal.net><br><b>Cc:</b> 'Healeys' <healeys@autox.team.net><br><b>Subject:</b> Re: [Healeys] Overdrive pump queries</span></p>
</div>
</div>
<p class="MsoNormal"> </p>
<p class="MsoNormal" style="margin-bottom:12pt;">David-help this
guy out here...he is getting desperate! He has been at this project
for months and can't get enough pressure. What size reamer and
where can he get one? He lives in UK. Thanks, Hank</p>
<p>-----------------------------------------</p>
<p class="MsoNormal" style="margin-bottom:12pt;">From: "David
Nock"<br>
To: <a>gradea1@charter.net</a><br>
Cc: "Michael Salter", "Healeys"<br>
Sent: Sunday August 29 2021 12:28:02PM<br>
Subject: Re: [Healeys] Overdrive pump queries<br><br>
Smacking the check ball will not make a new seat in the pump. You
must cut a new seat with a special reamer. </p>
<div>
<div>
<p class="MsoNormal">David Nock</p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
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