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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 I 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, <
healeys@autox.team.net> wrote:
> The symptoms I=E2=80=99ve seen and experienced are that the OD will engag=
e 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-rin=
gs.
> ------------------------------
> *From:* Healeys <healeys-bounces@autox.team.net> on behalf of Bob Spidell
> <bspidell@comcast.net>
> *Sent:* Thursday, March 25, 2021 11:14 PM
> *To:* healeys@autox.team.net <healeys@autox.team.net>
> *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 won=E2=80=99t allow the OD=
to build
> full operating pressure.
>
> Bill Lawrence
> BN1 #554
> ------------------------------
> *From:* Healeys <healeys-bounces@autox.team.net>
> <healeys-bounces@autox.team.net> on behalf of Kees Oudesluijs via Healeys
> <healeys@autox.team.net> <healeys@autox.team.net>
> *Sent:* Tuesday, March 23, 2021 7:37 AM
> *To:* healeys@autox.team.net <healeys@autox.team.net>
> <healeys@autox.team.net>
> *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. now it wil=
l
> go into o/d but pop out when accelerating. any
> > ideas what the cause is and the fix?
>
>
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<div dir=3D"auto">Time this question was put to bed.<div dir=3D"auto">1. Th=
e throttle switch is not supposed to disengage the overdrive if the dash sw=
itch is in the "OVERDRIVE" position. If it does the system is wir=
ed incorrectly. (BN1s are a little different)</div><div dir=3D"auto">2. Ove=
rdrives 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.=C2=A0 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=3D"auto">3. Overdrives and gearboxes in Healeys are me=
ant to be lubricated with engine oil. Decades ago I=C2=A0 wrote to Laycock =
DeNormanville, back when letters went in envelopes with stamps, and receive=
d a=C2=A0 response from their engineering department indicating clearly tha=
t the oil specified for their products was specified by the gearbox manufac=
turer and whatever they specified was acceptable for the overdrive.</div><d=
iv dir=3D"auto">M</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr=
" class=3D"gmail_attr">On Fri., Mar. 26, 2021, 2:13 a.m. WILLIAM B LAWRENCE=
via Healeys, <<a href=3D"mailto:healeys@autox.team.net";>healeys@autox.t=
eam.net</a>> wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"=
margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<div>The symptoms I=E2=80=99ve seen and experienced are that the OD will en=
gage and function until the oil temp comes up and the viscosity drops off a=
nd will then fail. I suppose it depends on the degree of degradation of the=
o-rings.</div>
<hr style=3D"display:inline-block;width:98%">
<div id=3D"m_2913893478454826311divRplyFwdMsg" dir=3D"ltr"><font face=3D"Ca=
libri, sans-serif" style=3D"font-size:11pt" color=3D"#000000"><b>From:</b> =
Healeys <<a href=3D"mailto:healeys-bounces@autox.team.net"; target=3D"_bl=
ank" rel=3D"noreferrer">healeys-bounces@autox.team.net</a>> on behalf of=
Bob Spidell <<a href=3D"mailto:bspidell@comcast.net"; target=3D"_blank" =
rel=3D"noreferrer">bspidell@comcast.net</a>><br>
<b>Sent:</b> Thursday, March 25, 2021 11:14 PM<br>
<b>To:</b> <a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank" rel=
=3D"noreferrer">healeys@autox.team.net</a> <<a href=3D"mailto:healeys@au=
tox.team.net" target=3D"_blank" rel=3D"noreferrer">healeys@autox.team.net</=
a>><br>
<b>Subject:</b> Re: [Healeys] overdrive problem</font>
<div>=C2=A0</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 sam=
e symptoms?<br>
<br>
<br>
<div>On 3/25/2021 4:07 PM, WILLIAM B LAWRENCE via Healeys wrote:<br>
</div>
<blockquote type=3D"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 i=
s faulty o-rings on the accumulator sleeve. This won=E2=80=99t allow the OD=
to build full operating pressure.</div>
<div><br>
</div>
<div>Bill Lawrence</div>
<div>BN1 #554</div>
<hr style=3D"display:inline-block;width:98%">
<div id=3D"m_2913893478454826311x_divRplyFwdMsg" dir=3D"ltr"><font face=3D"=
Calibri, sans-serif" color=3D"#000000" style=3D"font-size:11pt"><b>From:</b=
> Healeys
<a href=3D"mailto:healeys-bounces@autox.team.net"; target=3D"_blank" rel=3D"=
noreferrer"><healeys-bounces@autox.team.net></a> on behalf of Kees Ou=
desluijs via Healeys
<a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank" rel=3D"noreferr=
er"><healeys@autox.team.net></a><br>
<b>Sent:</b> Tuesday, March 23, 2021 7:37 AM<br>
<b>To:</b> <a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank" rel=
=3D"noreferrer">
healeys@autox.team.net</a> <a href=3D"mailto:healeys@autox.team.net"; target=
=3D"_blank" rel=3D"noreferrer">
<healeys@autox.team.net></a><br>
<b>Subject:</b> Re: [Healeys] overdrive problem</font>
<div>=C2=A0</div>
</div>
<div><font size=3D"2"><span style=3D"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.=C2=A0 solenoid was bad so replaced it.=C2=A0=
now it will go into o/d but pop out when accelerating.=C2=A0=C2=A0 any<br>
> ideas what the cause is and the fix?<br>
</div>
</span></font></div>
</blockquote>
<br>
</div>
</div>
_______________________________________________<br>
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<br>
</blockquote></div>
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