[Healeys] Clutch-related noise

[BJ8Healeys]

Anticipating removing the gearbox for rebuild of the overdrive (and to fix a clutch chattering problem in reverse), I bought a new carbon release bearing from Moss along with the new clutch in early 2014.  When I compared the old bearing with 80000+ miles on it with the new one, the old one had worn only 0.1" off of the 0.9" thickness.

I also never hold down the clutch pedal except to shift gears.  I didn't see any wear on the old pilot bush (also with 80K+ miles) or input shaft of the gearbox.

 

Steve Byers

HBJ8L/36666

BJ8 Registry

AHCA Delegate at Large

Havelock, NC  

 

 

From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of Bob Spidell
Sent: Monday, December 12, 2016 10:25 AM
Cc: healeys
Subject: Re: [Healeys] Clutch-related noise

 

Michael has a Toyota 5-speed.  

 

Anyways, my dad and I were discussing how to keep the graphite disk-type TO 'bearing' from wearing as much.  He suggested putting a return spring from the slave cylinder to the clutch fork, but I thought that would increase pedal travel too much as the cylinder push rod would have to travel farther to overcome the larger gap between the bearing and the clutch cover.  Note this is theoretical, I decided not to do it; we reused a graphite bearing with over 100K miles as it had plenty 'meat' on it (but I'm in the habit of putting the gearbox in neutral at every stop--the downside being possibly greater wear on the pilot bush and input shaft)

 

The roller release bearing can be found here:

 

https://www.ahspares.co.uk/austin-healey/performance-parts/Clutch/RELEASE-BEARING-BALL-RACE.aspx

 

Cheers,

Bob

 

  _____  

From: "Brian Drab" <bgdrab at eastlink.ca>
To: "Oudesluys" <coudesluijs at chello.nl>, "healeys" <healeys at autox.team.net>
Sent: Sunday, December 11, 2016 9:14:27 PM
Subject: Re: [Healeys] Clutch-related noise

 

Kees, I assume by clutch bearing, you mean the clutch throw-out or release bearing. On a BJ8, these have a solid carbon contact surface and do not move other than in or out depending on the pedal motion. I literally just replaced that bearing on a BJ8. I do realize that there is much more expensive throw out bearing that does utilize ball or roller bearings but I have never actually seen one of these. 

I know of no way to increase the pedal travel on a BJ8. The pedal to master cylinder is non adjustable and the slave cylinder to clutch is also non adjustable. 

When I mentioned, in an earlier post, the input shaft bearing of the transmission - this shaft is at engine speed with the clutch released, and motionless when the clutch pedal is depressed, which allows one to select gears without grinding them. Road speed has no influence on the transmission input shaft. I had exactly this problem on a vehicle (not a Healey) and that was the problem and was solved by replacing that  bearing. 

I certainly don’t know if that is the problem in this case but, to me, it is the only logical thing that is moving at engine speed (not road speed)  with the clutch released and the only thing that would be motionless (relatively speaking) when the clutch pedal is depressed.

Brian Drab

 

 

 

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