[Healeys] Mystery noise - Update

Sun Aug 23 06:21:18 MDT 2020

The fact that you report :
"With propshaft disconnected, am able hear noise in 2nd or 4th when
slipping clutch (reduces speed)"
Is probably significant.  I would be making every effort to determine that
3rd gear eliminates the noise completely before going any further.
Then carefully considering what is different in 2nd and 4th.

M

On Sun., Aug. 23, 2020, 5:41 a.m. John Harper via Healeys, <
healeys at autox.team.net> wrote:

> 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.
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>>
>> *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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