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Hi Michael,<br>
<br>
I rebuilt the gearbox and O/D probably about 7-8 years or so ago.
I've probably put close to 10K miles on it since, but not too many
since I moved to the Central Valley. For the last few years it's
been mostly short and day trips every month or two so, it's been
mostly sedentary. A few months ago I took it out for a spin and
noticed the O/D wouldn't engage at first but would start working
normally after maybe 20 minutes of driving. In subsequent runs it's
more not engaging, until a few days ago I'd decided I would likely
have to pull the gearbox and O/D, but had to pull it out to get it
off the QuickJack underneath it and, to my surprise it started to
work OK again after 15-20 miles.<br>
<br>
I rebuilt the O/D myself, and I think I did OK except I may not have
gotten the planetary gears depth exactly right; I didn't have a
selection of thrust washers to try so I just put the existing one
back in. The only thing I changed out was the thrust ring bearing,
which might have been a different width. The unit did have a very
slight vibration, barely noticeable through the floorboards but
otherwise operated perfectly. Now, when it works, it seems fine.
When I rebuilt the gearbox the rearmost thrust washer was whacked
(see pic), but of course I replaced it (how that could happen and
why the O/D worked is another mystery). I couldn't get the GB and
O/D to mate up so I took them to BCS where David Nock got them
together and set the operating shaft lift. Besides trying a new
relay at Tom Monaco's suggestion I haven't done anything else to it.<br>
<br>
Only thing I can guess is maybe the lever that the solenoid lifts to
turn the valve operating cam maybe slips sometimes and not others.<br>
<br>
Bob<br>
<br>
<div class="moz-cite-prefix">On 10/24/2025 8:00 PM, Michael Salter
wrote:<br>
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That does defy logic Bob.</div>
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Can you give a little history, has it always been this way or
did you change something? Did the problem develop slowly or over
time?</div>
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Anything else that may be relevant?</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif"
style="font-size:11pt" color="#000000"><b>From:</b> Healeys
<a class="moz-txt-link-rfc2396E" href="mailto:healeys-bounces@autox.team.net"><healeys-bounces@autox.team.net></a> on behalf of Bob
Spidell via Healeys <a class="moz-txt-link-rfc2396E" href="mailto:healeys@autox.team.net"><healeys@autox.team.net></a><br>
<b>Sent:</b> Friday, October 24, 2025 8:41:36 PM<br>
<b>To:</b> Healeys <a class="moz-txt-link-rfc2396E" href="mailto:healeys@autox.team.net"><healeys@autox.team.net></a><br>
<b>Subject:</b> [Healeys] Overdrive Conundrum</font>
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<div class="PlainText">Listers,<br>
<br>
I have a problem with my BJ8's overdrive that defies
conventional logic: <br>
The O/D will not engage when the drivetrain is cold, but
begins to <br>
function more-or-less normally as the drivetrain gets
fully heated-up <br>
(15-20m on a warm day). I've checked the functioning of
the electricals; <br>
i.e. when not running I can a) disconnect the coil ground
so as not to <br>
fry the Pertonix Ignitor, b) place the gearbox in 3rd or
4th and c) <br>
close either, or both, the dash switch and/or the switch
on the shift <br>
knob --they're wired in parallel so either one will engage
the O/D, but <br>
both need to be in off/open condition to disengage--and I
can hear the <br>
solenoid click firmly (this pretty much rules out the
switches). I have <br>
already replaced the scuttle relay to no effect (I have
had them get <br>
flaky). AFAIK, the throttle/'kickdown' switch only comes
into play when <br>
disengaging, and seems to work when the O/D does engage.<br>
<br>
My thinking is, if the pump is failed or failing the O/D
might work when <br>
the fluid is cold but cease to function as the fluid heats
up and thins <br>
out (I've used Redline MT-90 successfully for over 100K
miles or more; <br>
it's equivalent to 50wt engine oil). But, the O/D not
engaging when cold <br>
(somewhat) refutes this theory. If the outlet check valve
on the pump <br>
was somehow boogered I would expect either a) cold
function only, or b) <br>
no function at all. Ditto the solenoid; I'd expect it to
get flakey when <br>
hot and it does 'click' reliably (when cold). I can
imagine the lever on <br>
the operating cam slipping, but wouldn't expect that to
vary with <br>
temperature (or to work at all, actually). Actuating shaft
lift was <br>
correctly set at rebuild. I do have a DWM 'uprated'
accumulator <br>
installed, and the O/D engages within 2 seconds when it
functions.<br>
<br>
Anyone had this condition, or have a theory as to why it
behaves this <br>
way? Next step would be to remove the console and confirm
I have good <br>
oil pressure (but if I do, then what?).<br>
<br>
TIA,<br>
Bob<br>
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