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Hi Roger, you say "Disconnecting prop shaft to isolate diff not possible as
need the inertia of the rear wheels to produce the pulsing."
I think that is unlikely and would look into that more closely.
If you can get access to a "Chassis Ear" that would probably help a lot.
M
On Thu., Aug. 20, 2020, 1:28 p.m. Roger Grace via Healeys, <
healeys@autox.team.net> wrote:
> AH people - fighting a noise in my BJ8 that may or may not be serious.
> Reluctant to tear out the tranny unnecessarily and then to find it was
> something simple !
>
> Notice it at low speed (probably exists at driving speed but too much wind
> and engine
> noise) if shift to neutral and cut ignition to minimize engine and exhaust
> noise.
> Noise is pulsating - like a tire with a bad spot but seems to be at
> prop shaft speed.
>
> At first thought that it was at wheel speed and from R side.
> So changed out the R wheel bearing.
> No improvement
>
> Then while looking below noted that universals had some play.
> So changed out both universals.
> Rear brakes not dragging and no binding of wheels.
> No improvement.
>
> Did listening on hoist with others listening too. Consensus was that there
> was a noise at rear OD area as well as the pulsating one.
>
> So pulled annulus in situ and replaced both rear bearings. Quieter but
> still the pulsating noise while coasting in N.
>
> Sound file enclosed is a road test from about 15 MPH then shift to N and
> cut engine. Tunnel cover off.
>
> Able to replicate noise with engine on axle stands but not by turning a
> rear wheel by hand or with an e motor.
>
> Noise does appear to come from transmission.
>
> To verify is not diff removed one of the rear seats and noise doesn't
> appear to be coming from diff area.
> Disconnecting prop shaft to isolate diff not possible as need the inertia
> of the rear wheels to produce the pulsing.
>
> About 5k miles ago I changed out the larger OD front bearing (sourced from
> Moss ... ?) in the OD.
> OD works fine and transmission shifts and works OK without unusual
> noises.
>
> The pulsating/cyclical nature of the noise baffles me and not consistent
> with a bearing failure ?
>
> Given that it occurs in neutral with no gears meshing it surely is not a
> bad gear tooth etc.
> OD not engaged so it is locked so not likely there.
> Removed gearbox top cover and did inspection - nothing obvious.
> So to my mind this only leaves the GB rear bearing ?
> Or maybe a broken circlip or thrust washer and probably on main shaft
> external to gearbox ?
> or half shaft ?
>
> Any comments/thoughts appreciated from the more experienced among us.
> Tkx
> rg
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> Is
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<div dir=3D"auto"><div>Hi Roger, you say "<span style=3D"font-family:s=
ans-serif;font-size:12.8px">Disconnecting prop shaft to isolate diff not po=
ssible as need the inertia of the rear wheels to produce=C2=A0</span><span =
style=3D"font-family:sans-serif;font-size:12.8px">the pulsing."</span>=
</div><div dir=3D"auto"><font face=3D"sans-serif"><span style=3D"font-size:=
12.8px">I think that is unlikely and would look into that more closely.</sp=
an></font></div><div dir=3D"auto"><font face=3D"sans-serif"><span style=3D"=
font-size:12.8px">If you can get access to a "Chassis Ear" that w=
ould probably help a lot.</span></font></div><div dir=3D"auto"><font face=
=3D"sans-serif"><span style=3D"font-size:12.8px"><br></span></font></div><d=
iv dir=3D"auto"><font face=3D"sans-serif"><span style=3D"font-size:12.8px">=
M</span></font></div><div dir=3D"auto"><font face=3D"sans-serif"><span styl=
e=3D"font-size:12.8px"><br></span></font><br><div class=3D"gmail_quote" dir=
=3D"auto"><div dir=3D"ltr" class=3D"gmail_attr">On Thu., Aug. 20, 2020, 1:2=
8 p.m. Roger Grace via Healeys, <<a href=3D"mailto:healeys@autox.team.ne=
t">healeys@autox.team.net</a>> wrote:<br></div><blockquote class=3D"gmai=
l_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left=
:1ex"><div><div><div>AH people - fighting a noise in my BJ8 that may or may=
not be serious.</div><div>Reluctant to tear out the tranny unnecessarily a=
nd then to find it was something simple !<br></div><div>=C2=A0</div><div>No=
tice it at low speed (probably exists at driving speed but too much wind an=
d engine <br>noise) if shift to neutral and cut ignition to minimize engine=
and exhaust noise.</div><div>Noise is pulsating - like a tire with a bad s=
pot but seems to be at <br>prop shaft speed.</div><div>=C2=A0</div><div>At =
first thought that it was at wheel speed and from R side.</div><div>So chan=
ged out the R wheel bearing.</div><div>No improvement</div><div>=C2=A0</div=
><div>Then while looking below noted that universals had some play.</div><d=
iv>So changed out both universals.</div><div>Rear brakes not dragging and n=
o binding of wheels.</div><div>No improvement.</div><div>=C2=A0</div><div>D=
id listening on hoist with others listening too. Consensus was that there w=
as a noise at rear OD area as well as the pulsating one.</div><div><br></di=
v><div>So pulled annulus in situ and replaced both rear bearings. Quieter b=
ut still the pulsating noise while coasting in N.</div><div>=C2=A0</div><di=
v>Sound file enclosed is a road test from about 15 MPH then shift to N and =
cut engine. Tunnel cover off.<br></div><div><br></div><div>Able to replicat=
e noise with engine on axle stands but not by turning a rear wheel by hand =
or with an e motor.<br></div><div><br></div><div>Noise does appear to come =
from transmission.<br></div><div><div><br></div><div>To verify is not diff =
removed one of the rear seats and noise doesn't appear to be coming fro=
m diff area.<br></div><div>Disconnecting prop shaft to isolate diff not pos=
sible as need the inertia of the rear wheels to produce the pulsing.</div><=
/div><div>=C2=A0</div><div>About 5k miles ago I changed out the larger OD f=
ront bearing (sourced from <br>Moss ... ?) in the OD.</div><div>OD works fi=
ne and transmission shifts and works OK without unusual <br>noises.</div><d=
iv><br></div><div>The pulsating/cyclical nature of the noise baffles me and=
not consistent <br>with a bearing failure ?</div><div><br></div><div>Given=
that it occurs in neutral with no gears meshing it surely is not a bad gea=
r tooth etc.<br></div><div>OD not engaged so it is locked so not likely the=
re.<br></div><div>Removed gearbox top cover and did inspection - nothing ob=
vious.<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 sh=
aft external to gearbox ?<br></div><div>or half shaft ?<br></div><div><br><=
/div>Any comments/thoughts appreciated from the more experienced among us.<=
div>Tkx </div><div>rg<br></div></div></div>________________________________=
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Is
</blockquote></div></div></div>
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