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Replacement accumulators for type A OD's are availble, with slightly differ=
ent ID, and pistons with modern style O rings. Same OD.
This upgrade makes sense to me if you are replacing the accumulator.rg
----- Original Message -----
From: Michael Salter <michaelsalter@gmail.com>
To: WILLIAM B LAWRENCE <ynotink@msn.com>
Cc: healeys@autox.team.net
Sent: Tue, 30 Jul 2019 18:20:04 -0600 (MDT)
Subject: Re: [Healeys] OD Good news Bad news
Hi Bill,=20
The accumulators in all Austin Healeys actually have cast iron piston rings=
, not "O" rings.=20
There are "O" rings between the accumulator cylinder and the overdrive body=
but they seldom give problems.The overdrive piston, rings and aluminium bo=
re frequently become badly scored and require replacement.
M
On Sat, Jun 29, 2019 at 5:05 PM WILLIAM B LAWRENCE <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 developed.=20
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=20
From: Healeys <healeys-bounces@autox.team.net> on behalf of Bob Spidell <bs=
pidell@comcast.net>
Sent: Saturday, June 29, 2019 3:40 PM
To:healeys@autox.team.net
Subject: Re: [Healeys] OD Good news Bad news Either the pump, actuating pis=
tons or the accumulator. My guess would be the accumulator; mine still wor=
ked at 200K miles, but the cylinder was scored a little from the metal ring=
s on the piston. The actuating pistons have rubber O-rings that wear so ma=
y
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 accumulator a=
nd pump can be replaced in situ, but I've not 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 activa=
tion.
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 accumulator, and it wasn't the pro=
blem, at least you'll have a crisper OD when after you tear into it to repl=
ace the O-rings.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).
Bobps. My stock accumulator still worked normally, and I kept it; if you w=
ant 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 prudent to do =
so. Tranny oil topped off regularly and drained and cleanout of screen and =
magnets every two years. Using Redline MT90 for many years. Before that use=
d ND 30wt. Now I got it to go into OD. Every time. The good news. But it ta=
kes a loooong time. Many seconds. Just flip the switch at speed and =E2=80=
=9Ceventually=E2=80=9D it slowly slides into OD. Not crisp and instant like=
before.The bad news. It disengages normally as before. Flip, depress clutc=
h slightly, blip accelerator. I=E2=80=99ve researched the archives as much =
as possible on all the forums but am hesitant to proceed without forum\list=
wisdom. WD 67 BJ8 =20
_______________________________________________
Archive: http://www.team.net/pipermail/healeyshttp://autox.team.net/archive
Healeys@autox.team.net
http://autox.team.net/mailman/listinfo/healeys
lter@gmail.com
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<html><head><style> body {height: 100%; color:#000000; font-size:12pt; font=
-family:arial,helvetica,sans-serif;}</style></head><body><div>Replacement a=
ccumulators for type A OD's are availble, with slightly different ID, and p=
istons with modern style O rings. Same OD.<br></div><div>This upgrade makes=
sense to me if you are replacing the accumulator.<br data-mce-bogus=3D"1">=
</div><div>rg<br data-mce-bogus=3D"1"></div><div><br></div><div>----- Origi=
nal Message -----<br>From: Michael Salter <michaelsalter@gmail.com><b=
r>To: WILLIAM B LAWRENCE <ynotink@msn.com><br>Cc: healeys@autox.team.=
net<br>Sent: Tue, 30 Jul 2019 18:20:04 -0600 (MDT)<br>Subject: Re: [Healeys=
] OD Good news Bad news<br></div><div><br></div><div dir=3D"ltr"><div class=
=3D"gmail_default" style=3D"font-family: comic sans ms,sans-serif; font-siz=
e: small;" data-mce-style=3D"font-family: comic sans ms,sans-serif; font-si=
ze: small;">Hi Bill, <br></div><div class=3D"gmail_default" style=3D"font-f=
amily: comic sans ms,sans-serif; font-size: small;" data-mce-style=3D"font-=
family: comic sans ms,sans-serif; font-size: small;">The accumulators in al=
l Austin Healeys actually have cast iron piston rings, not "O" rings. <br><=
/div><div class=3D"gmail_default" style=3D"font-family: comic sans ms,sans-=
serif; font-size: small;" data-mce-style=3D"font-family: comic sans ms,sans=
-serif; font-size: small;">There are "O" rings between the accumulator cyli=
nder and the overdrive body but they seldom give problems.</div><div class=
=3D"gmail_default" style=3D"font-family: comic sans ms,sans-serif; font-siz=
e: small;" data-mce-style=3D"font-family: comic sans ms,sans-serif; font-si=
ze: small;">The overdrive piston, rings and aluminium bore frequently becom=
e badly scored and require replacement.</div><div class=3D"gmail_default" s=
tyle=3D"font-family: comic sans ms,sans-serif; font-size: small;" data-mce-=
style=3D"font-family: comic sans ms,sans-serif; font-size: small;"><br></di=
v><div class=3D"gmail_default" style=3D"font-family: comic sans ms,sans-ser=
if; font-size: small;" data-mce-style=3D"font-family: comic sans ms,sans-se=
rif; font-size: small;">M<br></div><div class=3D"gmail_default" style=3D"fo=
nt-family: comic sans ms,sans-serif; font-size: small;" data-mce-style=3D"f=
ont-family: comic sans ms,sans-serif; font-size: small;"><br></div></div><d=
iv><br></div><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_att=
r">On Sat, Jun 29, 2019 at 5:05 PM WILLIAM B LAWRENCE <<a href=3D"mailto=
:ynotink@msn.com" target=3D"_blank" data-mce-href=3D"mailto:ynotink@msn.com=
">ynotink@msn.com</a>> wrote:<br></div><blockquote class=3D"gmail_quote"=
style=3D"margin: 0px 0px 0px 0.8ex; border-left: 1px solid #cccccc; paddin=
g-left: 1ex;" data-mce-style=3D"margin: 0px 0px 0px 0.8ex; border-left: 1px=
solid #cccccc; padding-left: 1ex;"><div dir=3D"ltr"><div style=3D"font-fam=
ily: Calibri,Helvetica,sans-serif; font-size: 12pt; color: #000000;" data-m=
ce-style=3D"font-family: Calibri,Helvetica,sans-serif; font-size: 12pt; col=
or: #000000;"><br>The accumulator in the overdrives installed in Austin Hea=
leys have a reduced bore size to moderate the force of the shift into OD. T=
he bore sleeve or liner has rubber o-rings that seal the pressure in the ac=
cumulator bore. These o-rings deteriorate with time,<br> heat, and use and =
then they allow oil to leak past the accumulator piston thus reducing the p=
ressure that can be developed. </div><div style=3D"font-family: Calibr=
i,Helvetica,sans-serif; font-size: 12pt; color: #000000;" data-mce-style=3D=
"font-family: Calibri,Helvetica,sans-serif; font-size: 12pt; color: #000000=
;"><br></div><div style=3D"font-family: Calibri,Helvetica,sans-serif; font-=
size: 12pt; color: #000000;" data-mce-style=3D"font-family: Calibri,Helveti=
ca,sans-serif; font-size: 12pt; color: #000000;"><br>To replace them you ne=
ed to remove the side plate that holds the accumulator in place, place a do=
wel in the piston to hold it in place and pressurize the OD from the actuat=
or port valve thus forcing the sleeve out so the o-rings can be replaced.</=
div><div style=3D"font-family: Calibri,Helvetica,sans-serif; font-size: 12p=
t; color: #000000;" data-mce-style=3D"font-family: Calibri,Helvetica,sans-s=
erif; font-size: 12pt; color: #000000;"><br></div><div style=3D"font-family=
: Calibri,Helvetica,sans-serif; font-size: 12pt; color: #000000;" data-mce-=
style=3D"font-family: Calibri,Helvetica,sans-serif; font-size: 12pt; color:=
#000000;"><br>Bill Lawrence</div><div style=3D"font-family: Calibri,Helvet=
ica,sans-serif; font-size: 12pt; color: #000000;" data-mce-style=3D"font-fa=
mily: Calibri,Helvetica,sans-serif; font-size: 12pt; color: #000000;"><br>B=
N1 #554 </div><div id=3D"gmail-m_-7094427575546560480appendonsend"><br=
></div><hr style=3D"display: inline-block; width: 98%;" data-mce-style=3D"d=
isplay: inline-block; width: 98%;"><div id=3D"gmail-m_-7094427575546560480d=
ivRplyFwdMsg" dir=3D"ltr"><span data-mce-style=3D"font-size: 11pt; color: #=
000000; font-family: Calibri, sans-serif;" style=3D"font-size: 11pt; color:=
#000000; font-family: Calibri, sans-serif;" face=3D"Calibri, sans-serif" c=
olor=3D"#000000"><b>From:</b> Healeys <<a href=3D"mailto:healeys-bounces=
@autox.team.net" target=3D"_blank" data-mce-href=3D"mailto:healeys-bounces@=
autox.team.net">healeys-bounces@autox.team.net</a>> on behalf of Bob Spi=
dell <<a href=3D"mailto:bspidell@comcast.net"; target=3D"_blank" data-mce=
-href=3D"mailto:bspidell@comcast.net";>bspidell@comcast.net</a>><br><b>Se=
nt:</b> Saturday, June 29, 2019 3:40 PM<br><b>To:</b><a href=3D"mailto:heal=
eys@autox.team.net" target=3D"_blank" data-mce-href=3D"mailto:healeys@autox=
.team.net">healeys@autox.team.net</a><br><b>Subject:</b> Re: [Healeys] OD G=
ood news Bad news</span><div> </div></div><div style=3D"background-col=
or: #ffffff;" data-mce-style=3D"background-color: #ffffff;"><p>Either the p=
ump, actuating pistons or the accumulator. My guess would be the accu=
mulator; mine still worked at 200K miles, but the cylinder was scored a lit=
tle from the metal rings on the piston. The actuating pistons have ru=
bber O-rings that wear so may<br> not provide enough pressure to override t=
he heavy springs that keep the OD a 'single shaft' when the it's not operat=
ing. I believe the accumulator and pump can be replaced in situ, but =
I've not done it. Or some combination of the three. If you end =
up replacing<br> the accumulator I recommend the DWM 'uprated' one if you l=
ike crisp activation.<br></p><p>Check: 1) pressure at the actuating valve p=
ort (should be over 400psi at speed, but I think it'll work as low as 350--=
not sure), 2) that the actuating shaft rises the correct distance--I believ=
e it's 1/32"--when activated. If you have good pressure that<br> rule=
s out the pump. If you got the DWM accumulator, and it wasn't the pro=
blem, at least you'll have a crisper OD when after you tear into it to repl=
ace the O-rings.</p><p>I'm not surprised it disengages quickly; all the hyd=
raulics are there to override the 8 heavy springs; the springs shouldn't fa=
il (it's recommended to replace them if you do a complete rebuild, though I=
'm not convinced it's entirely necessary unless the<br> OD was slipping whe=
n engaged; I think it's a 'might as well while it's on the bench' thing).<b=
r></p><p>Bob</p><p>ps. My stock accumulator still worked normally, an=
d I kept it; if you want it I'll let it go for shipping cost.</p><p><br></p=
><div class=3D"gmail-m_-7094427575546560480x_moz-cite-prefix">On 6/29/2019 =
7:20 AM, Warren wrote:<br></div><blockquote><div class=3D"gmail-m_-70944275=
75546560480x_WordSection1"><p class=3D"gmail-m_-7094427575546560480x_MsoNor=
mal">Recently had the OD quit working. First time in 52 yrs. Luck? Removed =
tunnel and checked electrics and switches and solenoid seemed to work. Some=
hesitancy with solenoid at first. Replaced solenoid and interrupter switch=
as these were<br> original parts and with close to 200K on the car thought=
it prudent to do so. Tranny oil topped off regularly and drained and clean=
out of screen and magnets every two years. Using Redline MT90 for many year=
s. Before that used ND 30wt.</p><p class=3D"gmail-m_-7094427575546560480x_M=
soNormal"> </p><p class=3D"gmail-m_-7094427575546560480x_MsoNormal">No=
w I got it to go into OD. Every time. <b><span data-mce-style=3D"text-decor=
ation: underline;" style=3D"text-decoration: underline;">The good news</spa=
n></b><span data-mce-style=3D"text-decoration: underline;" style=3D"text-de=
coration: underline;">.</span> But it takes a loooong time. Many seconds. J=
ust flip the switch at speed and =E2=80=9Ceventually=E2=80=9D it slowly sli=
des into OD. Not crisp and instant like before.<b><span data-mce-style=3D"t=
ext-decoration: underline;" style=3D"text-decoration: underline;">The bad n=
ews</span></b>. It disengages normally as before. Flip, depress clutch slig=
htly, blip accelerator.</p><p class=3D"gmail-m_-7094427575546560480x_MsoNor=
mal"> </p><p class=3D"gmail-m_-7094427575546560480x_MsoNormal">I=E2=80=
=99ve researched the archives as much as possible on all the forums but am =
hesitant to proceed without forum\list wisdom.</p><p class=3D"gmail-m_-7094=
427575546560480x_MsoNormal"> </p><p class=3D"gmail-m_-7094427575546560=
480x_MsoNormal">WD 67 BJ8</p><p class=3D"gmail-m_-7=
094427575546560480x_MsoNormal"> </p><p class=3D"gmail-m_-7094427575546=
560480x_MsoNormal"> </p><br></div><pre class=3D"gmail-m_-7094427575546=
560480x_moz-quote-pre"></pre></blockquote></div></div><br><div><br></div>__=
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Archive: http://www.team.net/pipermail/healeys http://autox.team.net/archive
Healeys@autox.team.net
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