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I've had my HD8 carbs out/apart a few times for rebuilds or for head
work, etc., and I've not seen any evidence that--for my carbs,
anyway--the oil is lost by any means other than exiting the vent in
the cap (two oily splotches on the underside of the bonnet). The
vacuum seal around the piston in the vacuum chamber has to be all
but airtight, and I'm told they are custom machined and fitted to
each other (i.e. you don't want to swap parts in SUs).<br>
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<div class="moz-cite-prefix">On 6/18/2021 6:58 AM, i erbs via
Healeys wrote:<br>
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<div dir="auto">Seems oil could leave arournd threads of dashpots
or out vent holes in dashpots<br>
<br>
<div data-smartmail="gmail_signature">Ira Erbs<br>
1959 AH 100-6<br>
1967 MGB<br>
Milwaukie, OR</div>
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<div dir="ltr" class="gmail_attr">On Fri, Jun 18, 2021, 6:46 AM
healeyguy--- via Healeys <<a
href="mailto:healeys@autox.team.net" moz-do-not-send="true">healeys@autox.team.net</a>>
wrote:<br>
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<div style="color:black;font:10pt Arial,Helvetica,sans-serif">Bob
etal
<div>Contemplating the damper oil loss. What is the path of
the engine vacuum that allows/causes the oil to
disappear. </div>
<div>If the engine is not running there is no vacuum,
therefore no way for oil loss in an SU carb.</div>
<div>Engine running, engine vacuum could potentially pull at
carb parts interface that control the oil reservoir at two
locations, </div>
<div>That being the fit of the damper plunger tip to the
tube in the piston or the fit of the outside of the piston
tube to the chamber. </div>
<div>Suspect that oil loss is a result of a poor fit at
these locations.</div>
<div>P<br>
<br>
<div
style="font-family:arial,helvetica;font-size:10pt;color:black"><font
size="2">-----Original Message-----<br>
From: Bob Spidell <<a
href="mailto:bspidell@comcast.net" target="_blank"
rel="noreferrer" moz-do-not-send="true">bspidell@comcast.net</a>><br>
To: Michael Salter <<a
href="mailto:michaelsalter@gmail.com"
target="_blank" rel="noreferrer"
moz-do-not-send="true">michaelsalter@gmail.com</a>><br>
Cc: <a href="mailto:healeys@autox.team.net"
target="_blank" rel="noreferrer"
moz-do-not-send="true">healeys@autox.team.net</a>
<<a href="mailto:healeys@autox.team.net"
target="_blank" rel="noreferrer"
moz-do-not-send="true">healeys@autox.team.net</a>><br>
Sent: Thu, Jun 17, 2021 11:16 pm<br>
Subject: Re: [Healeys] HD8 Su's<br>
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<div id="m_4835443311576230233yiv9259953231">
<div> Yeah ... I overfill a little and let them find
their level.<br clear="none">
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id="m_4835443311576230233yiv9259953231yqtfd17584">
<div>On 6/17/2021 9:34 AM, Michael Salter wrote:<br
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<div>Actually Bob even that is too much ...
resistance just before the cap reaches the
threads is sufficient. At that level I find
that the oil never goes away.
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<div dir="ltr">On Thu., Jun. 17, 2021, 10:34
a.m. Bob Spidell, <<a rel="nofollow
noopener noreferrer noreferrer"
shape="rect"
href="mailto:bspidell@comcast.net"
target="_blank" moz-do-not-send="true">bspidell@comcast.net</a>>
wrote:<br clear="none">
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<div> My observation as well. I fill them
until you feel resistance when the cap is
about a half inch from the top of the
carb.<br clear="none">
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<div>On 6/16/2021 10:47 PM, Alan Seigrist
via Healeys wrote:<br clear="none">
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<div dir="ltr">Roger -
<div><br clear="none">
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<div>you don't need that much oil in
the HD8 pistons for this to work
correctly. HD8s throw all excess
oil out the vent... so if you are
overfilling it will all go out
anyway.</div>
<div><br clear="none">
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<div>The main thing to check is to
take the dampers out and slide
them back in with the shaft
straight up, and if you feel
resistance toward the bottom....
you don't need to refill. I
suspect you are overthinking it.
I used to think HD8s use too much
oil until I realised they don't
need all that much to work
correctly.</div>
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<div>Cheers,</div>
<div><br clear="none">
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<div>Alan</div>
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<div dir="ltr">On Thu, Jun 17, 2021
at 12:59 AM Roger Grace via
Healeys <<a rel="nofollow
noopener noreferrer noreferrer"
shape="rect"
href="mailto:healeys@autox.team.net"
target="_blank"
moz-do-not-send="true">healeys@autox.team.net</a>>
wrote:<br clear="none">
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<div>Ok have spoken to Joe who
was most helpful.<br
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<div>We did some measurements
together over the phone and
established that my dampers
are correct.</div>
<div>He says that he has
encountered this before but
not sure of the reason.<br
clear="none">
</div>
<div>Suggests that I run the
dashpots dry then start again.</div>
<div>In meantime he will do more
research.</div>
<div>rg<br clear="none">
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