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I can't offer any suggestions, or even a good guess, but I think
you're going to have to pull your OD to find out what's causing the
noise (after you've eliminated all other possibilities, of course).
When I rebuilt my gearbox about 3 years ago I decided to go through
the OD since it had over 205K miles on it. I found this (see photo;
note the deformed thrust washer and the fretting on the inside of
the annulus). But the OD operated perfectly and was no louder than
normal (it's possible I didn't notice an increase in noise over the
135K miles I drove the car, on top of all the other Healey noises).
Now, the rebuilt OD has a slight 'beat frequency' when engaged that
you can feel through the floor pans; I suspect I didn't get the
sun/planetary/annulus depth setting exactly perfect, but it's
operated fine for over 6K miles and hasn't gotten worse so I can
live with it. I'd consider going through it again, but with limited
opportunities to take long drives in the near future it's down the
list of priorities.<br>
<br>
FWIW, I think a failed bearing would make a continuous, gruesome
noise, though I did have a water pump fail on my dad's '55 T-Bird
before I sold it. Sounded for all the world like rod knock.<br>
<br>
Bob<br>
<br>
<br>
<div class="moz-cite-prefix">On 8/22/2020 7:54 PM, David Porter
wrote:<br>
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<p dir="ltr">Well, then it is rotational for sure, not a bearing
that is failing but perhaps already failed, perhaps allowing
the O/D annulus to scrape the surrounding housing...though it
did not sound like steel on aluminum to me. You have moved the
noise from rear to midway.. perhaps if you haven't, check for
a failed motor mount and the crank pulley scraping the cross
member?? DP</p>
<br>
<br>
On August 22, 2020, at 6:46 PM, Roger Grace via Healeys
<a class="moz-txt-link-rfc2396E" href="mailto:healeys@autox.team.net"><healeys@autox.team.net></a> wrote:<br>
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<div>Not a lot of progress...<br>
</div>
<div><br>
</div>
<div>Brake cable is well clear of propshaft and securely
clipped.</div>
<div><br>
</div>
<div>Universal U joint/spline phasing is correct.</div>
<div><br>
</div>
<div>Been doing lots of listening with stethoscope.<br>
</div>
<div>With propshaft disconnected, am able hear noise in 2nd or
4th when slipping clutch (reduces speed)<br>
</div>
<div>Assume is the same noise and less distinct because of the
engine noise.<br>
</div>
<div>Not nearly as distinct as when shaft is connected and rear
wheels freewheeling in neutral and engine off.<br>
</div>
<div>Loudest area seems to be rear GB casing near rear bearing.<br>
</div>
<div>This still does not sound like a bearing to my ears ?<br>
</div>
<div><br>
</div>
<div>Plan to try to get a 2nd expert opinion with younger ears !<br>
</div>
<div><br>
</div>
<div>rg</div>
</div>
<div><br>
</div>
<div>----- Original Message -----<br>
From: David Nock <<a href="mailto:healeydoc@gmail.com"
moz-do-not-send="true">healeydoc@gmail.com</a>><br>
To: Roger Grace <<a href="mailto:roggrace@telus.net"
moz-do-not-send="true">roggrace@telus.net</a>>,
'healeylist' <<a href="mailto:healeys@autox.team.net"
moz-do-not-send="true">healeys@autox.team.net</a>><br>
Sent: Thu, 20 Aug 2020 12:47:51 -0600 (MDT)<br>
Subject: Re: [Healeys] Mystery noise<br>
</div>
<div><br>
</div>
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<div>Drive shaft hitting the handbrake cable when the car is
jacked up. Probably <br>
will go away when sitting on the ground.</div>
<div> </div>
<div> </div>
<div style="font-size: 12pt; font-family: 'Century'; color:
#000000;" data-mce-style="font-size: 12pt; font-family:
'Century'; color: #000000;">David <br>
Nock<br>
<a href="mailto:healeydoc@sbcglobal.net"
moz-do-not-send="true">healeydoc@sbcglobal.net</a><br>
209 948 <br>
8767<br>
<a href="http://www.britishcarspecialists.com"
moz-do-not-send="true">www.britishcarspecialists.com</a><br>
<div><br>
</div>
Help us have our Founder Norman <br>
Nock inducteed into the <br>
British Sportscar Hall of Fame, You can vote for <br>
your favorites <br>
by visiting the site <br>
at.<br>
<a href="http://www.britishsportscarhalloffame.org"
moz-do-not-send="true">www.britishsportscarhalloffame.org</a><br>
</div>
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<div style="font-color: black;"
data-mce-style="font-color: black;"><b>From:</b><a
title="healeys@autox.team.net"
moz-do-not-send="true">Roger Grace via Healeys</a><br>
</div>
<div><b>Sent:</b> Thursday, August 20, 2020 10:27 AM</div>
<div><b>To:</b><a title="healeys@autox.team.net"
moz-do-not-send="true">'healeylist'</a><br>
</div>
<div><b>Subject:</b> [Healeys] Mystery noise</div>
</div>
</div>
<div> </div>
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<div>
<div>AH people - fighting a noise in my BJ8 that may or
may not be <br>
serious.</div>
<div>Reluctant to tear out the tranny unnecessarily and
then to find it was <br>
something simple !<br>
</div>
<div> </div>
<div>Notice it at low speed (probably exists at driving
speed but too much wind <br>
and engine <br>
noise) if shift to neutral and cut ignition to minimize
engine <br>
and exhaust noise.</div>
<div>Noise is pulsating - like a tire with a bad spot but
seems to be at <br>
<div><br>
</div>
prop shaft speed.</div>
<div> </div>
<div>At first thought that it was at wheel speed and from
R side.</div>
<div>So changed out the R wheel bearing.</div>
<div>No improvement</div>
<div> </div>
<div>Then while looking below noted that universals had
some play.</div>
<div>So changed out both universals.</div>
<div>Rear brakes not dragging and no binding of wheels.</div>
<div>No improvement.</div>
<div> </div>
<div>Did listening on hoist with others listening too.
Consensus was that there <br>
was a noise at rear OD area as well as the pulsating
one.</div>
<div> </div>
<div>So pulled annulus in situ and replaced both rear
bearings. Quieter but <br>
still the pulsating noise while coasting in N.</div>
<div> </div>
<div>Sound file enclosed is a road test from about 15 MPH
then shift to N and <br>
cut engine. Tunnel cover off.<br>
</div>
<div> </div>
<div>Able to replicate noise with engine on axle stands
but not by turning a <br>
rear wheel by hand or with an e motor.<br>
</div>
<div> </div>
<div>Noise does appear to come from transmission.<br>
</div>
<div>
<div> </div>
<div>To verify is not diff removed one of the rear seats
and noise doesn't <br>
appear to be coming from diff area.<br>
</div>
<div>Disconnecting prop shaft to isolate diff not
possible as need the inertia <br>
of the rear wheels to produce the pulsing.</div>
</div>
<div> </div>
<div>About 5k miles ago I changed out the larger OD front
bearing (sourced from <br>
<div><br>
</div>
Moss ... ?) in the OD.</div>
<div>OD works fine and transmission shifts and works OK
without unusual <br>
<div><br>
</div>
noises.</div>
<div> </div>
<div>The pulsating/cyclical nature of the noise baffles me
and not consistent <br>
<div><br>
</div>
with a bearing failure ?</div>
<div> </div>
<div>Given that it occurs in neutral with no gears meshing
it surely is not a <br>
bad gear tooth etc.<br>
</div>
<div>OD not engaged so it is locked so not likely there.<br>
</div>
<div>Removed gearbox top cover and did inspection -
nothing obvious.<br>
</div>
<div>So to my mind this only leaves the GB rear bearing ?</div>
<div>Or maybe a broken circlip or thrust washer and
probably on main shaft <br>
external to gearbox ?<br>
</div>
<div>or half shaft ?<br>
</div>
<div> </div>
Any comments/thoughts appreciated from the more
experienced <br>
among us. <br>
<div>Tkx</div>
<div>rg<br>
</div>
</div>
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