[Healeys] Mystery noise - Update

Elton S eps2660 at gmail.com
Sun Aug 23 12:36:17 MDT 2020


Speedo cable noise? Try disconnecting the speedo cable at the gearbox.
Elton

On Sun, Aug 23, 2020 at 1:32 PM Michael Salter via Healeys <
healeys at autox.team.net> wrote:

> Are 2nd or 4th gears still perquisites ?
>
> M
>
> On Sun., Aug. 23, 2020, 11:35 a.m. Roger Grace via Healeys, <
> healeys at autox.team.net> wrote:
>
>> Thank you.
>> Noise is independent of engine rotating; most apparent with engine off in
>> neutral and coasting - in the stillness of no engine noises.
>> rg
>>
>>
>> ----- Original Message -----
>> From: John Harper <ah100register at gmail.com>
>> To: David Porter <frogeye at porterscustom.com>
>> Cc: Roger Grace <roggrace at telus.net>, David Nock <healeydoc at gmail.com>,
>> healeys at autox team. net <healeys at autox.team.net>
>> Sent: Sun, 23 Aug 2020 03:40:44 -0600 (MDT)
>> Subject: Re: [Healeys] Mystery noise - Update
>>
>> David
>>
>> Is your fan belt in good order. I had one that was 'lumpy' with some
>> cross sections being different to others. I had great difficulty working
>> out where the vibration came from. In the event it was the car that told me
>> by fracturing the dynamo bracket
>>
>> On Sun, 23 Aug 2020 at 03:54, David Porter <frogeye at porterscustom.com>
>> wrote:
>>
>>> 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
>>>
>>>
>>> On August 22, 2020, at 6:46 PM, Roger Grace via Healeys <
>>> healeys at autox.team.net> wrote:
>>>
>>> Not a lot of progress...
>>>
>>> Brake cable is well clear of propshaft and securely clipped.
>>>
>>> Universal U joint/spline phasing is correct.
>>>
>>> Been doing lots of listening with stethoscope.
>>> With propshaft disconnected, am able hear noise in 2nd or 4th when
>>> slipping clutch (reduces speed)
>>> Assume is the same noise and less distinct because of the engine noise.
>>> Not nearly as distinct as when shaft is connected and rear wheels
>>> freewheeling in neutral and engine off.
>>> Loudest area seems to be rear GB casing near rear bearing.
>>> This still does not sound like a bearing to my ears ?
>>>
>>> Plan to try to get a 2nd expert opinion with younger ears !
>>>
>>> rg
>>>
>>> ----- Original Message -----
>>> From: David Nock <healeydoc at gmail.com>
>>> To: Roger Grace <roggrace at telus.net>, 'healeylist' <
>>> healeys at autox.team.net>
>>> Sent: Thu, 20 Aug 2020 12:47:51 -0600 (MDT)
>>> Subject: Re: [Healeys] Mystery noise
>>>
>>> Drive shaft hitting the handbrake cable when the car is jacked up.
>>> Probably
>>> will go away when sitting on the ground.
>>>
>>>
>>> David
>>> Nock
>>> healeydoc at sbcglobal.net
>>> 209 948
>>> 8767
>>> www.britishcarspecialists.com
>>>
>>> Help us have our Founder Norman
>>> Nock inducteed into the
>>> British Sportscar Hall of Fame, You can vote for
>>> your favorites
>>> by visiting the site
>>> at.
>>> www.britishsportscarhalloffame.org
>>>
>>> *From:*Roger Grace via Healeys
>>> *Sent:* Thursday, August 20, 2020 10:27 AM
>>> *To:*'healeylist'
>>> *Subject:* [Healeys] Mystery noise
>>>
>>> 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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>>
>> --
>> Best wishes
>>
>> John Harper
>>
>> AHC UK 100 Register Secretary
>>
>>
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