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Maybe of interest to some: AFAIK, all O/D accumulators came with metal
rings, which likely cause or at least contribute to scoring. One of the
Brit suppliers--probably AHS but I'm not sure--has an accumulator setup
that uses an O-ring(s) instead of metal rings, which should prevent
scoring. I rebuilt my O/D a couple years back, and if I'd known of the
O-ring type I would have installed it. Earlier O/Ds used metal rings in
the actuator pistons, but later ones had O-rings, and it's logical to
conclude LdeN went to O-rings there because of excessive scoring of the
cases (or, possibly, because they were cheaper).
On 3/26/2021 6:03 AM, Michael Salter via Healeys wrote:
> Time this question was put to bed.
> 1. The throttle switch is not supposed to disengage the overdrive if
> the dash switch is in the "OVERDRIVE" position. If it does the system
> is wired incorrectly. (BN1s are a little different)
> 2. Overdrives which slip out, slip, or won't engage WHEN HOT but do
> work when cold are invariably suffering from low oil pressure which is
> almost always caused by accumulator issues. The "O" rings on the
> outside of the accumulator sleeve can be a problem but in my
> experience scoring of the accumulator bore and damage to the rings and
> piston are a more common cause.
> 3. Overdrives and gearboxes in Healeys are meant to be lubricated with
> engine oil. Decades ago IÂ wrote to Laycock DeNormanville, back when
> letters went in envelopes with stamps, and received a response from
> their engineering department indicating clearly that the oil specified
> for their products was specified by the gearbox manufacturer and
> whatever they specified was acceptable for the overdrive.
> M
>
> On Fri., Mar. 26, 2021, 2:13 a.m. WILLIAM B LAWRENCE via Healeys,
>
> The symptoms Iâ??ve seen and experienced are that the OD will engage
> and function until the oil temp comes up and the viscosity drops
> off and will then fail. I suppose it depends on the degree of
> degradation of the o-rings.
> ------------------------------------------------------------------------
> *From:* Healeys <healeys-bounces@autox.team.net
> *Sent:* Thursday, March 25, 2021 11:14 PM
> *Subject:* Re: [Healeys] overdrive problem
> Sure, but wouldn't faulty O-rings prevent the OD from engaging in
> the first place? Just guessing, but wouldn't a deficient pump
> cause same symptoms?
>
>
> On 3/25/2021 4:07 PM, WILLIAM B LAWRENCE via Healeys wrote:
>> Sorry, but the Laycock deNormanville overdrive is not supposed to
>> kick down automatically. The most common fault that causes the OD
>> to drop out is faulty o-rings on the accumulator sleeve. This
>> wonâ??t allow the OD to build full operating pressure.
>>
>> Bill Lawrence
>> BN1 #554
>> ------------------------------------------------------------------------
>> *From:* Healeys <healeys-bounces@autox.team.net>
>> Oudesluijs via Healeys <healeys@autox.team.net>
>> *Sent:* Tuesday, March 23, 2021 7:37 AM
>> *Subject:* Re: [Healeys] overdrive problem
>> That is the way it should be when accelerating hard, Kick down!!
>>
>> Kees Oudesluijs
>>
>>
>> Op 23-3-2021 om 01:06 schreef healeymanjim via Healeys:
>> > friends BT7 had o/d quit. solenoid was bad so replaced it.Â
>> now it will go into o/d but pop out when accelerating.  any
>> > ideas what the cause is and the fix?
>
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Maybe of interest to some: AFAIK, all O/D accumulators came with
metal rings, which likely cause or at least contribute to scoring.
One of the Brit suppliers--probably AHS but I'm not sure--has an
accumulator setup that uses an O-ring(s) instead of metal rings,
which should prevent scoring. I rebuilt my O/D a couple years back,
and if I'd known of the O-ring type I would have installed it.
Earlier O/Ds used metal rings in the actuator pistons, but later
ones had O-rings, and it's logical to conclude LdeN went to O-rings
there because of excessive scoring of the cases (or, possibly,
because they were cheaper).<br>
<br>
<div class="moz-cite-prefix">On 3/26/2021 6:03 AM, Michael Salter
via Healeys wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAB3i7L+N-4edz+07Ym74Szb--8tvfX93vBVmr2DTbE5nZCN5mg@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="auto">Time this question was put to bed.
<div dir="auto">1. The throttle switch is not supposed to
disengage the overdrive if the dash switch is in the
"OVERDRIVE" position. If it does the system is wired
incorrectly. (BN1s are a little different)</div>
<div dir="auto">2. Overdrives which slip out, slip, or won't
engage WHEN HOT but do work when cold are invariably suffering
from low oil pressure which is almost always caused by
accumulator issues. The "O" rings on the outside of the
accumulator sleeve can be a problem but in my experience
scoring of the accumulator bore and damage to the rings and
piston are a more common cause.</div>
<div dir="auto">3. Overdrives and gearboxes in Healeys are meant
to be lubricated with engine oil. Decades ago IÂ wrote to
Laycock DeNormanville, back when letters went in envelopes
with stamps, and received a response from their engineering
department indicating clearly that the oil specified for their
products was specified by the gearbox manufacturer and
whatever they specified was acceptable for the overdrive.</div>
<div dir="auto">M</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri., Mar. 26, 2021, 2:13
a.m. WILLIAM B LAWRENCE via Healeys, <<a
href="mailto:healeys@autox.team.net";
moz-do-not-send="true">healeys@autox.team.net</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<div>The symptoms Iâ??ve seen and experienced are that the OD
will engage and function until the oil temp comes up and
the viscosity drops off and will then fail. I suppose it
depends on the degree of degradation of the o-rings.</div>
<hr style="display:inline-block;width:98%">
<div id="m_2913893478454826311divRplyFwdMsg" dir="ltr"><font
style="font-size:11pt" face="Calibri, sans-serif"
color="#000000"><b>From:</b> Healeys <<a
href="mailto:healeys-bounces@autox.team.net";
target="_blank" rel="noreferrer"
moz-do-not-send="true">healeys-bounces@autox.team.net</a>>
on behalf of Bob Spidell <<a
href="mailto:bspidell@comcast.net"; target="_blank"
rel="noreferrer"
moz-do-not-send="true">bspidell@comcast.net</a>><br>
<b>Sent:</b> Thursday, March 25, 2021 11:14 PM<br>
<b>To:</b> <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>
<b>Subject:</b> Re: [Healeys] overdrive problem</font>
<div>Â </div>
</div>
<div>Sure, but wouldn't faulty O-rings prevent the OD from
engaging in the first place? Just guessing, but wouldn't a
deficient pump cause same symptoms?<br>
<br>
<br>
<div>On 3/25/2021 4:07 PM, WILLIAM B LAWRENCE via Healeys
wrote:<br>
</div>
<blockquote type="cite">
<div>Sorry, but the Laycock deNormanville overdrive is
not supposed to kick down automatically. The most
common fault that causes the OD to drop out is faulty
o-rings on the accumulator sleeve. This wonâ??t allow
the OD to build full operating pressure.</div>
<div><br>
</div>
<div>Bill Lawrence</div>
<div>BN1 #554</div>
<hr style="display:inline-block;width:98%">
<div id="m_2913893478454826311x_divRplyFwdMsg" dir="ltr"><font
style="font-size:11pt" face="Calibri, sans-serif"
color="#000000"><b>From:</b> Healeys
<a href="mailto:healeys-bounces@autox.team.net";
target="_blank" rel="noreferrer"
moz-do-not-send="true"><healeys-bounces@autox.team.net></a>
on behalf of Kees Oudesluijs via Healeys
<a href="mailto:healeys@autox.team.net";
target="_blank" rel="noreferrer"
moz-do-not-send="true"><healeys@autox.team.net></a><br>
<b>Sent:</b> Tuesday, March 23, 2021 7:37 AM<br>
<b>To:</b> <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>
<b>Subject:</b> Re: [Healeys] overdrive problem</font>
<div>Â </div>
</div>
<div><font size="2"><span style="font-size:11pt">
<div>That is the way it should be when
accelerating hard, Kick down!!<br>
<br>
Kees Oudesluijs<br>
<br>
<br>
Op 23-3-2021 om 01:06 schreef healeymanjim via
Healeys:<br>
> friends BT7 had o/d quit. solenoid was bad
so replaced it. now it will go into o/d but pop
out when accelerating.  any<br>
> ideas what the cause is and the fix?<br>
</div>
</span></font></div>
</blockquote>
<br>
</div>
</div>
</blockquote>
</div>
</blockquote>
<br>
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