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--></style></head><body lang=3DEN-US link=3Dblue vlink=3D"#954F72" style=3D=
'word-wrap:break-word'><div class=3DWordSection1><p class=3DMsoNormal>Bob,<=
/p><p class=3DMsoNormal>Interesting observation.</p><p class=3DMsoNormal>On=
ly 30/40 wt non detergent oil was used from new till 2013=C2=A0 at which ti=
me I switched</p><p class=3DMsoNormal>to Redline MT90 @ 181,000 miles.</p><=
p class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>Sent from <a =
href=3D"https://go.microsoft.com/fwlink/?LinkId=3D550986";>Mail</a> for Wind=
ows</p><p class=3DMsoNormal><o:p> </o:p></p><div style=3D'mso-element:=
para-border-div;border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0i=
n 0in 0in'><p class=3DMsoNormal style=3D'border:none;padding:0in'><b>From: =
</b><a href=3D"mailto:bspidell@comcast.net";>Bob Spidell</a><br><b>Sent: </b=
>Thursday, August 4, 2022 9:38 AM<br><b>To: </b><a href=3D"mailto:flyhiheal=
ey@gmail.com">Warren Dietz</a>; <a href=3D"mailto:healeys@autox.team.net";>h=
ealeys@autox.team.net</a><br><b>Subject: </b>Re: [Healeys] DW overdrive pis=
ton</p></div><p class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal=
>Warren,<br><br>Your accumulator piston and housing look to have a bit wors=
e scoring than mine; I used synthetic fluid for over half the life of mine,=
I wonder if that made a difference?<br><br><br><br><o:p></o:p></p><blockqu=
ote style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><p class=3DMsoNormal><o:=
p> </o:p></p><p class=3DMsoNormal> <o:p></o:p></p><p class=3DMsoN=
ormal>Sent from <a href=3D"https://go.microsoft.com/fwlink/?LinkId=3D550986=
">Mail</a> for Windows<o:p></o:p></p><p class=3DMsoNormal> <o:p></o:p>=
</p><p class=3DMsoNormal>This was the condition of my piston and housing wi=
th close to 200,000 miles. Tranny was well maintained.<o:p></o:p></p><p cla=
ss=3DMsoNormal>The original metal rings lasted 53 years. So I guess with un=
known quality of either of todays metal vs rubber<o:p></o:p></p><p class=3D=
MsoNormal>O rings, let the experiments begin. <o:p></o:p></p><p class=3DMso=
Normal> <o:p></o:p></p><p class=3DMsoNormal> <o:p></o:p></p><p cl=
ass=3DMsoNormal> <o:p></o:p></p><div style=3D'border:none;border-top:s=
olid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=3DMsoNormal><b>From:=
</b><a href=3D"mailto:bspidell@comcast.net";>Bob Spidell</a><br><b>Sent: </=
b>Wednesday, August 3, 2022 10:12 PM<br><b>To: </b><a href=3D"mailto:healey=
s@autox.team.net">healeys@autox.team.net</a><br><b>Subject: </b>Re: [Healey=
s] DW overdrive piston<o:p></o:p></p></div><p class=3DMsoNormal> <o:p>=
</o:p></p><p class=3DMsoNormal style=3D'margin-bottom:12.0pt'>The rings wil=
l score the inside of the piston housing, though not badly (photo at 205K m=
iles). Looks like there's a side load on the piston, probably from the spri=
ng.<br><br>I donated this accumulator to another owner; never heard how the=
y worked. Moss shows the rings available (but who knows?).<o:p></o:p></p><d=
iv><p class=3DMsoNormal>On 8/3/2022 12:36 PM, Henry G Leach via Healeys wro=
te:<o:p></o:p></p></div><blockquote style=3D'margin-top:5.0pt;margin-bottom=
:5.0pt'><p class=3DMsoNormal>I assemble ODs using the original metal rings =
and have not had any issues with pressure or engagement/disengagement. <o:p=
></o:p></p><div><p class=3DMsoNormal> <o:p></o:p></p></div><div><p cla=
ss=3DMsoNormal>When Mr. DeNormanville stayed up in the middle of the night =
to engineer the operation of the unit, I think he decided that the us=
e of softer rings (sacrificial metal) against a hardened casing was the bes=
t solution for control and wear. If a rubber o-ring was a better solu=
tion, he would have used one with the proper buna rating.<o:p></o:p></p></d=
iv><div><p class=3DMsoNormal> <o:p></o:p></p></div><div><p class=3DMso=
Normal style=3D'margin-bottom:12.0pt'>I think the bigger problem, now-a-day=
s, is the availability of the metal piston rings. Rubber O rings are =
a dime-a-dozen. If you contact Overdrive Spares in the UK, they shoul=
d be able to supply the proper rings. If they too, have decided to go=
with rubber, then plan on a breakdown/rebuild in a shorter period of time =
than units equipped with the original parts that last a long, long time. Ha=
nk<o:p></o:p></p><p>-----------------------------------------</p><p class=
=3DMsoNormal style=3D'margin-bottom:12.0pt'>From: "Michael Salter"=
; <br>To: <a href=3D"mailto:healeys@autox.team.net";>"healeys@autox.tea=
m.net"</a><br>Cc: <br>Sent: Wednesday August 3 2022 9:38:15AM<br>Subje=
ct: Re: [Healeys] DW overdrive piston<o:p></o:p></p><div><div><p class=3DMs=
oNormal><span style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'>I h=
ave a question about the "O" ring type of accumulator.</span><o:p=
></o:p></p></div><div><p class=3DMsoNormal><span style=3D'font-size:12.0pt;=
font-family:"Arial",sans-serif'>The way the accumulator works is that when =
it is fully charged the piston moves against the spring until the rings rea=
ch the radial holes in the wall of the housing which acts to relieve any ex=
cess pressure.</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span s=
tyle=3D'font-size:12.0pt;font-family:"Arial",sans-serif'>My concern is that=
at 3 - 400 p.s.i. oil will obviously get behind the "O" ring and=
force the material of the "O" ring into those radial holes and t=
hen, as the piston moves back over them, a piece of the ring will shear off=
.</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span style=3D'font-=
size:12.0pt;font-family:"Arial",sans-serif'>I'm guessing that Laycock-DeNor=
manville used the complex cast iron rings rather than "O" rings b=
ecause they recognized the possibility of this happening.</span><o:p></o:p>=
</p></div><div><p class=3DMsoNormal><span style=3D'font-size:12.0pt;font-fa=
mily:"Arial",sans-serif'>I'm sure that tiny pieces of the "O" rin=
g would be found in the filter if this was a problem. Anyone found them or =
noticed damage to their accumulator "O" ring upon disassembly?</s=
pan><o:p></o:p></p></div><div><p class=3DMsoNormal><span style=3D'font-size=
:12.0pt;font-family:"Arial",sans-serif'> </span><o:p></o:p></p></div><=
div><p class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Arial=
",sans-serif'>M</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'> </span><o:p=
></o:p></p></div></div><p class=3DMsoNormal> <o:p></o:p></p><div><div>=
<p class=3DMsoNormal>On Wed, Aug 3, 2022 at 9:08 AM Bob Spidell <a href=3D"=
mailto:bspidell@comcast.net";><bspidell@comcast.net></a> wrote:<o:p></=
o:p></p></div><blockquote style=3D'border:none;border-left:solid #CCCCCC 1.=
0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-rig=
ht:0in;margin-bottom:5.0pt'><p class=3DMsoNormal style=3D'mso-margin-top-al=
t:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:153.6pt'>I put one =
in my BJ8's O/D. It's subjective*--O/Ds seem to work a little<br>quicker wi=
th cold, thick oil than hot oil--but it cuts maybe a third off<br>engagemen=
t time on average. I had the O/D on the bench and disassembled,<br>and the =
current one had a scored barrel so, why not? Engagement isn't<br>much, if a=
ny, harsher than before which, I believe is the reason DMH<br>wanted the we=
aker, smaller spring. If I'd known about it, I might have<br>bought AHSpare=
s' with an O-ring instead.<br><br>* I've never really 'timed' O/D functioni=
ng, it would be a bit awkward;<br>anyone done it? I usually tap the clutch =
pedal when engaging O/D, and<br>give a little throttle when disengaging. I =
thought mine engaged a little<br>quicker when I switched to synthetic fluid=
from engine oil, but in all<br>cases confirmation bias may be involved.<br=
><br><br><br>On 8/2/2022 8:09 PM, Joseph Costa wrote:<br>> Has anyone in=
stalled their upgraded overdrive piston? If so, is it<br>> worth t=
he trouble ?<br>><br>> Joe<br>> BN1 #923<br>><o:p></o:p></p></b=
lockquote></div></div></blockquote><p class=3DMsoNormal> <o:p></o:p></=
p><p class=3DMsoNormal> <o:p></o:p></p></blockquote><p class=3DMsoNorm=
al><o:p> </o:p></p><p class=3DMsoNormal><o:p> </o:p></p></div></b=
ody></html>=
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