[Healeys] Clutch-related noise

[Ed O'Neal]

Michael,

Approximately 15,000 miles after having replaced the carbon release bearing, I noted a similar sound – actually within a little time it turned into more of a grinding sound.  Upon inspection, the release bearing was completely worn out.  I blamed it on a poor quality release bearing.  While replacing the bearing, I noted that the slave cylinder (without depressing the clutch peddle) was pushing the bearing into contact with the clutch plate.  Thus the bearing would be continuously in contact during all driving conditions (mostly70 MPH on I75).  I bled the system several times – no help.  I changed the master cylinder – no help.  Something was pushing the slave cylinder piston out.  I didn’t think there was a spring in the slave cylinder – there wouldn’t need to be one there anyway.  Then I took a very close look at the Moss slave cylinder diagram.  There it was, just barely visible, peeking out of the cylinder – THE SPRING.

I removed the spring.  Now 25,000 miles later everything is still working fine!

When you disassemble things, check for this situation.

Ed

ed at wadsworthoneal.com<mailto:ed at wadsworthoneal.com>

Edward J. O’Neal, P.E., Pte.
Wadsworth O’Neal Associates, Inc.
6418 Commerce Park Drive
Fort Myers, Florida  33966
phone:  (239) 245-8728
cell:        (239) 410-6174


From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of Michael Oritt
Sent: Monday, December 12, 2016 5:28 AM
To: Michael MacLean
Cc: Austin Healey
Subject: Re: [Healeys] Clutch-related noise

Michael--

Thanks for the input and you may be correct, but as said it is possible that the noise is nothing new and simply a function of my driving the car buttoned up. hearing what was not evident earlier.

Since the sound appears to be present even at idle I am going to put the car up on stands and see if I can pin it down from underneath while it is running with a stethoscope as Michael Salter suggested.

I don't plan to drive it till it breaks but as I said earlier if it is a failing bearing--thrust, throwout or input shaft, etc.--it will certainly make itself more evident as its condition deteriorates.

I am on it--Michael Oritt

On Sun, Dec 11, 2016 at 7:51 PM, Michael MacLean <rrengineer.mike at att.net<mailto:rrengineer.mike at att.net>> wrote:
You know, by now you should have figured out you have to take it apart in any case.  There is nothing you can do while it is assembled in the car.  99% of the time you never know what is really wrong until you disassemble and inspect.  Best case you will end up with a new clutch and throw out bearing.  Hopefully nothing wrong with the transmission, but it would not hurt to do a cursory internal inspection while it is out.  Better to head off trouble before it becomes a real and expensive problem.  Or, you can just drive it until it breaks. Just my 2 cents.
Mike MacLean

On Sunday, December 11, 2016 4:26 PM, Michael Oritt <michael.oritt at gmail.com<mailto:michael.oritt at gmail.com>> wrote:

It seems unrelated to engine speed and sounds the same with the car stationary in neutral and clutch out as it does at speed in any gear.

Best--Michael Oritt


On Sun, Dec 11, 2016 at 3:24 PM, Michael Salter <michaelsalter at gmail.com<mailto:michaelsalter at gmail.com>> wrote:
Michael,
Can you determine if the noise is related to engine speed?
Michael S

On Sat, Dec 10, 2016 at 4:57 PM, Michael Oritt <michael.oritt at gmail.com<mailto:michael.oritt at gmail.com>> wrote:
While driving today I noticed a new noise: A faint but constant whining/
purring sound that is present when the clutch pedal is NOT depressed, whether in neutral or in gear and whether in motion or sitting still.

When I depress the clutch pedal the sound goes away. Clutch and transmission operation seem normal. BTW I have a Toyota five-speed with a BJ8 diaphragm clutch.

Thoughts please?

Best--Michael Oritt

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--
If you can't fix it with a hammer, you've got an electrical problem.


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