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Mike,
Yes, I was talking about the O-rings between the housing and the accumulat=
or sleeve. They are rubber and do indeed break down and fail with heat, age=
and pressure. When they leak you lose operating pressure in the accumulato=
r. When mine failed the OD would work fine until the oil warmed up and then=
the OD would drop out. Dave Porter gave me the diagnosis and explained how=
to correct it and my OD has been perfect since. (Knock wood.)
Bill Lawrence
BN1#554
________________________________
From: Michael Salter <michaelsalter@gmail.com>
Sent: Wednesday, July 31, 2019 12:20 AM
To: WILLIAM B LAWRENCE <ynotink@msn.com>
Cc: Bob Spidell <bspidell@comcast.net>; healeys@autox.team.net <healeys@aut=
ox.team.net>
Subject: Re: [Healeys] OD Good news Bad news
Hi Bill,
The accumulators in all Austin Healeys actually have cast iron piston rings=
, not "O" rings.
There are "O" rings between the accumulator cylinder and the overdrive body=
but they seldom give problems.
The overdrive piston, rings and aluminium bore frequently become badly scor=
ed and require replacement.
M
ynotink@msn.com>> wrote:
The accumulator in the overdrives installed in Austin Healeys have a reduce=
d bore size to moderate the force of the shift into OD. The bore sleeve or =
liner has rubber o-rings that seal the pressure in the accumulator bore. Th=
ese o-rings deteriorate with time, heat, and use and then they allow oil to=
leak past the accumulator piston thus reducing the pressure that can be de=
veloped.
To replace them you need to remove the side plate that holds the accumulato=
r in place, place a dowel in the piston to hold it in place and pressurize =
the OD from the actuator port valve thus forcing the sleeve out so the o-ri=
ngs can be replaced.
Bill Lawrence
BN1 #554
________________________________
omcast.net>>
Sent: Saturday, June 29, 2019 3:40 PM
Subject: Re: [Healeys] OD Good news Bad news
Either the pump, actuating pistons or the accumulator. My guess would be t=
he accumulator; mine still worked at 200K miles, but the cylinder was score=
d a little from the metal rings on the piston. The actuating pistons have =
rubber O-rings that wear so may not provide enough pressure to override the=
heavy springs that keep the OD a 'single shaft' when the it's not operatin=
g. I believe the accumulator and pump can be replaced in situ, but I've no=
t done it. Or some combination of the three. If you end up replacing the =
accumulator I recommend the DWM 'uprated' one if you like crisp activation.
Check: 1) pressure at the actuating valve port (should be over 400psi at sp=
eed, but I think it'll work as low as 350--not sure), 2) that the actuating=
shaft rises the correct distance--I believe it's 1/32"--when activated. I=
f you have good pressure that rules out the pump. If you got the DWM accum=
ulator, and it wasn't the problem, at least you'll have a crisper OD when a=
fter you tear into it to replace the O-rings.
I'm not surprised it disengages quickly; all the hydraulics are there to ov=
erride the 8 heavy springs; the springs shouldn't fail (it's recommended to=
replace them if you do a complete rebuild, though I'm not convinced it's e=
ntirely necessary unless the OD was slipping when engaged; I think it's a '=
might as well while it's on the bench' thing).
Bob
ps. My stock accumulator still worked normally, and I kept it; if you want=
it I'll let it go for shipping cost.
On 6/29/2019 7:20 AM, Warren wrote:
Recently had the OD quit working. First time in 52 yrs. Luck? Removed tunne=
l and checked electrics and switches and solenoid seemed to work. Some hesi=
tancy with solenoid at first. Replaced solenoid and interrupter switch as t=
hese were original parts and with close to 200K on the car thought it prude=
nt to do so. Tranny oil topped off regularly and drained and cleanout of sc=
reen and magnets every two years. Using Redline MT90 for many years. Before=
that used ND 30wt.
Now I got it to go into OD. Every time. The good news. But it takes a loooo=
ng time. Many seconds. Just flip the switch at speed and =93eventually=94 i=
t slowly slides into OD. Not crisp and instant like before. The bad news. I=
t disengages normally as before. Flip, depress clutch slightly, blip accele=
rator.
I=92ve researched the archives as much as possible on all the forums but am=
hesitant to proceed without forum\list wisdom.
WD 67 BJ8
_______________________________________________
Archive: http://www.team.net/pipermail/healeys http://autox.team.net/archiv=
e
http://autox.team.net/mailman/listinfo/healeys
lter@gmail.com
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<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DWindows-1=
252">
<style type=3D"text/css" style=3D"display:none;"> P {margin-top:0;margin-bo=
ttom:0;} </style>
</head>
<body dir=3D"ltr">
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
color: rgb(0, 0, 0);">
Mike,</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
color: rgb(0, 0, 0);">
Yes, I was talking about the O-rings between the housing and the accu=
mulator sleeve. They are rubber and do indeed break down and fail with heat=
, age and pressure. When they leak you lose operating pressure in the accum=
ulator. When mine failed the OD would
work fine until the oil warmed up and then the OD would drop out. Dave Por=
ter gave me the diagnosis and explained how to correct it and my OD has bee=
n perfect since. (Knock wood.)</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
color: rgb(0, 0, 0);">
Bill Lawrence</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
color: rgb(0, 0, 0);">
BN1#554</div>
<div id=3D"appendonsend"></div>
<hr style=3D"display:inline-block;width:98%" tabindex=3D"-1">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" st=
yle=3D"font-size:11pt" color=3D"#000000"><b>From:</b> Michael Salter <mi=
chaelsalter@gmail.com><br>
<b>Sent:</b> Wednesday, July 31, 2019 12:20 AM<br>
<b>To:</b> WILLIAM B LAWRENCE <ynotink@msn.com><br>
<b>Cc:</b> Bob Spidell <bspidell@comcast.net>; healeys@autox.team.net=
<healeys@autox.team.net><br>
<b>Subject:</b> Re: [Healeys] OD Good news Bad news</font>
<div> </div>
</div>
<div>
<div dir=3D"ltr">
<div class=3D"x_gmail_default" style=3D"font-family:comic sans ms,sans-seri=
f; font-size:small">
Hi Bill, <br>
</div>
<div class=3D"x_gmail_default" style=3D"font-family:comic sans ms,sans-seri=
f; font-size:small">
The accumulators in all Austin Healeys actually have cast iron piston rings=
, not "O" rings.
<br>
</div>
<div class=3D"x_gmail_default" style=3D"font-family:comic sans ms,sans-seri=
f; font-size:small">
There are "O" rings between the accumulator cylinder and the over=
drive body but they seldom give problems.</div>
<div class=3D"x_gmail_default" style=3D"font-family:comic sans ms,sans-seri=
f; font-size:small">
The overdrive piston, rings and aluminium bore frequently become badly scor=
ed and require replacement.</div>
<div class=3D"x_gmail_default" style=3D"font-family:comic sans ms,sans-seri=
f; font-size:small">
<br>
</div>
<div class=3D"x_gmail_default" style=3D"font-family:comic sans ms,sans-seri=
f; font-size:small">
M<br>
</div>
<div class=3D"x_gmail_default" style=3D"font-family:comic sans ms,sans-seri=
f; font-size:small">
<br>
</div>
</div>
<br>
<div class=3D"x_gmail_quote">
<div dir=3D"ltr" class=3D"x_gmail_attr">On Sat, Jun 29, 2019 at 5:05 PM WIL=
LIAM B LAWRENCE <<a href=3D"mailto:ynotink@msn.com";>ynotink@msn.com</a>&=
gt; wrote:<br>
</div>
<blockquote class=3D"x_gmail_quote" style=3D"margin:0px 0px 0px 0.8ex; bord=
er-left:1px solid rgb(204,204,204); padding-left:1ex">
<div dir=3D"ltr">
<div style=3D"font-family:Calibri,Helvetica,sans-serif; font-size:12pt; col=
or:rgb(0,0,0)">
The accumulator in the overdrives installed in Austin Healeys have a reduce=
d bore size to moderate the force of the shift into OD. The bore sleeve or =
liner has rubber o-rings that seal the pressure in the accumulator bore. Th=
ese o-rings deteriorate with time,
heat, and use and then they allow oil to leak past the accumulator piston =
thus reducing the pressure that can be developed. </div>
<div style=3D"font-family:Calibri,Helvetica,sans-serif; font-size:12pt; col=
or:rgb(0,0,0)">
<br>
</div>
<div style=3D"font-family:Calibri,Helvetica,sans-serif; font-size:12pt; col=
or:rgb(0,0,0)">
To replace them you need to remove the side plate that holds the accumulato=
r in place, place a dowel in the piston to hold it in place and pressurize =
the OD from the actuator port valve thus forcing the sleeve out so the o-ri=
ngs can be replaced.</div>
<div style=3D"font-family:Calibri,Helvetica,sans-serif; font-size:12pt; col=
or:rgb(0,0,0)">
<br>
</div>
<div style=3D"font-family:Calibri,Helvetica,sans-serif; font-size:12pt; col=
or:rgb(0,0,0)">
Bill Lawrence</div>
<div style=3D"font-family:Calibri,Helvetica,sans-serif; font-size:12pt; col=
or:rgb(0,0,0)">
BN1 #554 </div>
<div id=3D"x_gmail-m_-7094427575546560480appendonsend"></div>
<hr style=3D"display:inline-block; width:98%">
<div id=3D"x_gmail-m_-7094427575546560480divRplyFwdMsg" dir=3D"ltr"><font f=
ace=3D"Calibri, sans-serif" color=3D"#000000" style=3D"font-size:11pt"><b>F=
rom:</b> Healeys <<a href=3D"mailto:healeys-bounces@autox.team.net"; targ=
et=3D"_blank">healeys-bounces@autox.team.net</a>>
on behalf of Bob Spidell <<a href=3D"mailto:bspidell@comcast.net"; targe=
t=3D"_blank">bspidell@comcast.net</a>><br>
<b>Sent:</b> Saturday, June 29, 2019 3:40 PM<br>
<b>To:</b> <a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank">heal=
eys@autox.team.net</a><br>
<b>Subject:</b> Re: [Healeys] OD Good news Bad news</font>
<div> </div>
</div>
<div style=3D"background-color:rgb(255,255,255)">
<p>Either the pump, actuating pistons or the accumulator. My guess wo=
uld be the accumulator; mine still worked at 200K miles, but the cylinder w=
as scored a little from the metal rings on the piston. The actuating =
pistons have rubber O-rings that wear so may
not provide enough pressure to override the heavy springs that keep the OD=
a 'single shaft' when the it's not operating. I believe the accumula=
tor and pump can be replaced in situ, but I've not done it. Or some c=
ombination of the three. If you end up replacing
the accumulator I recommend the DWM 'uprated' one if you like crisp activa=
tion.<br>
</p>
<p>Check: 1) pressure at the actuating valve port (should be over 400psi at=
speed, but I think it'll work as low as 350--not sure), 2) that the actuat=
ing shaft rises the correct distance--I believe it's 1/32"--when activ=
ated. If you have good pressure that
rules out the pump. If you got the DWM accumulator, and it wasn't th=
e problem, at least you'll have a crisper OD when after you tear into it to=
replace the O-rings.</p>
<p>I'm not surprised it disengages quickly; all the hydraulics are there to=
override the 8 heavy springs; the springs shouldn't fail (it's recommended=
to replace them if you do a complete rebuild, though I'm not convinced it'=
s entirely necessary unless the
OD was slipping when engaged; I think it's a 'might as well while it's on =
the bench' thing).<br>
</p>
<p>Bob</p>
<p>ps. My stock accumulator still worked normally, and I kept it; if =
you want it I'll let it go for shipping cost.</p>
<p><br>
</p>
<div class=3D"x_gmail-m_-7094427575546560480x_moz-cite-prefix">On 6/29/2019=
7:20 AM, Warren wrote:<br>
</div>
<blockquote type=3D"cite">
<div class=3D"x_gmail-m_-7094427575546560480x_WordSection1">
<p class=3D"x_gmail-m_-7094427575546560480x_MsoNormal">Recently had the OD =
quit working. First time in 52 yrs. Luck? Removed tunnel and checked electr=
ics and switches and solenoid seemed to work. Some hesitancy with solenoid =
at first. Replaced solenoid and interrupter
switch as these were original parts and with close to 200K on the car thou=
ght it prudent to do so. Tranny oil topped off regularly and drained and cl=
eanout of screen and magnets every two years. Using Redline MT90 for many y=
ears. Before that used ND 30wt.</p>
<p class=3D"x_gmail-m_-7094427575546560480x_MsoNormal"> </p>
<p class=3D"x_gmail-m_-7094427575546560480x_MsoNormal">Now I got it to go i=
nto OD. Every time.
<b><u>The good news</u></b><u>.</u> But it takes a loooong time. Many secon=
ds. Just flip the switch at speed and =93eventually=94 it slowly slides int=
o OD. Not crisp and instant like before.<b>
<u>The bad news</u></b>. It disengages normally as before. Flip, depress cl=
utch slightly, blip accelerator.</p>
<p class=3D"x_gmail-m_-7094427575546560480x_MsoNormal"> </p>
<p class=3D"x_gmail-m_-7094427575546560480x_MsoNormal">I=92ve researched th=
e archives as much as possible on all the forums but am hesitant to proceed=
without forum\list wisdom.</p>
<p class=3D"x_gmail-m_-7094427575546560480x_MsoNormal"> </p>
<p class=3D"x_gmail-m_-7094427575546560480x_MsoNormal">WD  =
; 67 BJ8 </p>
<p class=3D"x_gmail-m_-7094427575546560480x_MsoNormal"> </p>
<p class=3D"x_gmail-m_-7094427575546560480x_MsoNormal"> </p>
<br>
</div>
<pre class=3D"x_gmail-m_-7094427575546560480x_moz-quote-pre"></pre>
</blockquote>
</div>
</div>
_______________________________________________<br>
rer" target=3D"_blank">
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