[Healeys] Mystery noise - Update

Michael MacLean rrengineer.mike at att.net
Sun Aug 23 14:20:24 MDT 2020


 You know where this is going.  Pull it.Mike MacLean

    On Sunday, August 23, 2020, 12:05:05 PM PDT, Roger Grace via Healeys <healeys at autox.team.net> wrote:  
 
 #yiv2787218348 body {min-height:100%;color:#000000;font-size:12pt;font-family:arial, helvetica, sans-serif;}M - thank you for your interest and ideas.

Ok have just done another test session.
All listening with one of those stethoscope things.
Seems worst at rear area of GB.

(a) Prop shaft connected.
Both rear wheels free and wheels mounted.
Same results for single wheel free.
Noise is distinct when start in 4th at about 20 MPH; OD out; shift to neutral and cut ignition.
As wheels slow down the noise becomes more pronounced and don't rally need scope to hear the beat - particularly as it approaches zero speed.
At higher speed the the fast repetitions makes the sound of the individual beats blend together.

(b) Prop shaft not connected and engine running
In this mode not possible to do the shift to neutral and cut ignition routine as engine slows down too quickly.
So run at as slow a speed as possible in the different gears.
OD out
all 3 gears similar.
the beat sound not as loud as at (a) but do believe that is because of the background engine noise.So in 2nd was able to control speed best and at low speed could hear the individual beats at low speed.
Could also hear the problem in 3rd and 4th but speed higher so not as distinct because of the increased RPM.
1st just too noisy for testing.

Getting close to biting the bullet pulling it out ... grr !!

rg



----- Original Message -----
From: Michael Salter via Healeys <healeys at autox.team.net>
To: John Harper <ah100register at gmail.com>
Cc: healeys at autox team. net <healeys at autox.team.net>
Sent: Sun, 23 Aug 2020 06:21:18 -0600 (MDT)
Subject: Re: [Healeys] Mystery noise - Update

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 
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by visiting the site 
at.
www.britishsportscarhalloffame.org
 From:Roger Grace via Healeys
Sent: Thursday, August 20, 2020 10:27 AMTo:'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. 
Tkxrg


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-- 
Best wishes
John Harper
AHC UK 100 Register Secretary
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