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Strange case indeed. My guess--and it's only a guess--is that the cone
clutch in the O/D is worn and slipping when the oil is hot. The cone
clutch is a 'wet' type, and AFAIK new ones aren't available (DWM sells
relined ones, with a core of course). When the O/D is not engaged, eight
very strong springs hold the cone clutch together as a 'solid' unit,
when you engage the O/D oil pressure--yours appears to be
adequate--pushes a couple pistons that force the cone clutch apart and
locks the sun gear, which starts overrunning of the output gearing
(hence 'overdrive'). Since new clutches aren't available, yours may be
original and not have sufficient material to fully engage the outer part
(FWIW, I went through my BJ8's O/D and it still had sufficient material
at 205K miles; I attribute this to my superior O/D operating technique ;)).
The other thing is the springs; I read somewhere--possibly in the shop
manual--that these springs should ALWAYS be replaced when going through
the O/D and, even though mine looked fine I bit the bullet and bought a
new set. It's possible the springs weaken over time and become unable to
keep the cone clutch engaged in all conditions (e.g. hot, slippery oil).
Again, this is just a semi-informed guess, but maybe someone can expand
on it.
Bob
On 5/20/2021 2:41 PM, Rafael Abugattas via Healeys wrote:
>
> Hi all,
>
> Last year I requested your help regarding a strange overdrive or
> slippage problem I have in my 1962 Tricarb BT7.
>
> I received very valuable comments and suggestions but sadly the
> problem persists: Overdrive would not activate under any circumstances
> and when the engine / transmission is warm and we engage reverse, the
> engine revs but the car won´t move.
>
> There is slippage somewhere in the transmission / clutch or overdrive.
> When the car is cold, reverse engages without any issues. This only
> happens in reverse gear after the car has been driven a few miles and
> the engine and transmission are warm. Forward gears engage all the
> time without any issues.
>
> The car has been recently restored. Before the restoration the
> overdrive was operational. Now itâ??s not.
>
> The transmission and overdrive have been taken apart and assembled
> twice looking for something visually wrong. Everything seemed to be OK.
>
> The clutch and plate were also removed for inspection. The clutch was
> recently redone, adjusted and tested.
>
> A friend suggested we should verify the oil pressure on the overdrive.
> On this link you will find a couple of videos of a test we have
> recently done with a manometer installed on the overdrive to check the
> oil pressure at different RPM´s.
>
> https://www.dropbox.com/sh/t5p8kqz6v6yduyt/AADizyVMyBKPozy284B-udA4a?dl=0
> <https://www.dropbox.com/sh/t5p8kqz6v6yduyt/AADizyVMyBKPozy284B-udA4a?dl=0>
>
> The pressure on 3rd and 4th gears goes up to 400 psi and drops as it
> goes to lower gears. At idle is between 150 to 200 psi
>
> In forward gears the car runs fine; the problem that we need to solve
> is that the overdrive would not activate(even though it is connected
> and everything seems visually OK) and the slippage we have when
> engaging reverse (the car won´t move) when the engine / transmission
> is warm.
>
> We are located in Lima â?? Peru and as you may imagine, there are not
> many experts in this particular area of expertise.
>
> Any thoughts or suggestions from you collective knowledge and wisdom
> on how to proceed will be much appreciated.
>
> Thanks in advance!
>
> Rafael
>
>
>
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Strange case indeed. My guess--and it's only a guess--is that the
cone clutch in the O/D is worn and slipping when the oil is hot. The
cone clutch is a 'wet' type, and AFAIK new ones aren't available
(DWM sells relined ones, with a core of course). When the O/D is not
engaged, eight very strong springs hold the cone clutch together as
a 'solid' unit, when you engage the O/D oil pressure--yours appears
to be adequate--pushes a couple pistons that force the cone clutch
apart and locks the sun gear, which starts overrunning of the output
gearing (hence 'overdrive'). Since new clutches aren't available,
yours may be original and not have sufficient material to fully
engage the outer part (FWIW, I went through my BJ8's O/D and it
still had sufficient material at 205K miles; I attribute this to my
superior O/D operating technique ;)).<br>
<br>
The other thing is the springs; I read somewhere--possibly in the
shop manual--that these springs should ALWAYS be replaced when going
through the O/D and, even though mine looked fine I bit the bullet
and bought a new set. It's possible the springs weaken over time and
become unable to keep the cone clutch engaged in all conditions
(e.g. hot, slippery oil).<br>
 <br>
Again, this is just a semi-informed guess, but maybe someone can
expand on it.<br>
<br>
Bob<br>
<br>
<br>
<div class="moz-cite-prefix">On 5/20/2021 2:41 PM, Rafael Abugattas
via Healeys wrote:<br>
</div>
<blockquote type="cite"
cite="mid:604018491.4470645.1621546916052@mail.yahoo.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div class="yahoo-style-wrap" style="font-family:Helvetica Neue,
Helvetica, Arial, sans-serif;font-size:13px;">
<div dir="ltr" data-setdir="false">
<div>
<p class="ydpfe39e09bxyiv3660242746msonormal"
style="background:white"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">Hi
all,</span></p>
<p class="ydpfe39e09bxyiv3660242746msonormal"
style="background:white"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">Last
year I requested
your help regarding a strange overdrive or slippage
problem I have in my 1962
Tricarb BT7. </span></p>
<p class="ydpfe39e09bxyiv3660242746msonormal"
style="background:white"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">I
received very
valuable comments and suggestions but sadly the problem
persists: Overdrive
would not activate under any circumstances and when the
engine / transmission
is warm and we engage reverse, the engine revs but the
car won´t move. </span></p>
<p class="ydpfe39e09bxyiv3660242746msonormal"
style="background:white"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">There
is slippage
somewhere in the transmission / clutch or overdrive.
When the car is cold,
reverse engages without any issues. This only happens in
reverse gear after the
car has been driven a few miles and the engine and
transmission are warm.
Forward gears engage all the time without any issues.</span></p>
<p class="ydpfe39e09bxyiv3660242746msonormal"
style="background:white"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">The
car has been
recently restored. Before the restoration the overdrive
was operational. Now
itâ??s not. </span></p>
<p class="ydpfe39e09bxyiv3660242746msonormal"
style="background:white"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">The
transmission and
overdrive have been taken apart and assembled twice
looking for something
visually wrong. Everything seemed to be OK.</span></p>
<p class="ydpfe39e09bxyiv3660242746msonormal"
style="background:white"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">The
clutch and plate
were also removed for inspection. The clutch was
recently redone, adjusted and
tested.</span></p>
<p class="ydpfe39e09bxyiv3660242746msonormal"
style="background:white"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">A
friend suggested we
should verify the oil pressure on the overdrive. On this
link you will find a
couple of videos of a test we have recently done with a
manometer installed on
the overdrive to check the oil pressure at different
RPM´s. </span></p>
<p class="ydpfe39e09bxyiv3660242746msonormal"
style="background:white"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"><a
href="https://www.dropbox.com/sh/t5p8kqz6v6yduyt/AADizyVMyBKPozy284B-udA4a?dl=0";
rel="nofollow" target="_blank"
moz-do-not-send="true">https://www.dropbox.com/sh/t5p8kqz6v6yduyt/AADizyVMyBKPozy284B-udA4a?dl=0</a></span></p>
<p class="ydpfe39e09bMsoNormal"><span>The pressure on 3rd
and 4th gears goes up
to 400 psi and drops as it goes to lower gears. At idle
is between 150 to 200
psi</span></p>
<p class="ydpfe39e09bxyiv3660242746msonormal"
style="background:white"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">In
forward gears the
car runs fine; the problem that we need to solve is that
the overdrive would not
activate(even though it is connected and everything
seems visually OK) and the
slippage we have when engaging reverse (the car won´t
move) when the engine /
transmission is warm.</span></p>
<p class="ydpfe39e09bxyiv3660242746msonormal"
style="background:white"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">We
are located in
Lima â?? Peru and as you may imagine, there are not many
experts in this
particular area of expertise.</span></p>
<p class="ydpfe39e09bxyiv3660242746msonormal"
style="background:white"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">Any
thoughts or suggestions
from you collective knowledge and wisdom on how to
proceed will be much
appreciated. </span></p>
<p class="ydpfe39e09bxyiv3660242746msonormal"
style="background:white"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">Thanks
in advance!</span></p>
<p class="ydpfe39e09bxyiv3660242746msonormal"
style="background: white; orphans: 2; widows: 2;
text-decoration-style: initial; text-decoration-color:
initial; word-spacing: 0px;"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-ansi-language:ES-MX"
lang="ES-MX">Rafael</span></p>
<p class="ydpfe39e09bMsoNormal">Â </p>
</div>
<br>
</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<pre class="moz-quote-pre"
wrap="">_______________________________________________
Archive: <a class="moz-txt-link-freetext"
href="http://www.team.net/pipermail/healeys";>http://www.team.net/pipermail/healeys</a>
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href="http://autox.team.net/archive";>http://autox.team.net/archive</a>
<a class="moz-txt-link-abbreviated"
href="mailto:Healeys@autox.team.net";>Healeys@autox.team.net</a>
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href="http://autox.team.net/mailman/listinfo/healeys";>http://autox.team.net/mailman/listinfo/healeys</a>
</pre>
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