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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>
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<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
it’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 – 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"> </p>
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