[Healeys] Mystery noise
gradea1 at charter.net
gradea1 at charter.net
Sun Aug 23 23:55:02 MDT 2020
Roger- When you get it all apart you may find a damaged or frozen
overdrive pump wheel...being cam driven it, would have a pulse. Hank
-----------------------------------------From: "Roger Grace via
Healeys"
To: "Michael Salter"
Cc: "healeys at autox team. net"
Sent: Sunday August 23 2020 12:05:34PM
Subject: Re: [Healeys] Mystery noise - Update
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
To: John Harper
Cc: 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, 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 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 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
To: Roger Grace , 'healeylist'
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 [7]
209 948
8767
www.britishcarspecialists.com [8]
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 [9]
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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AHC UK 100 Register Secretary
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