[Healeys] Clutch-related noise

[Bob Spidell]

My pilot bush didn't show much wear, but the input shaft did.


On 12/12/2016 11:03 AM, BJ8Healeys wrote:
>
> 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 <mailto:bgdrab at eastlink.ca>>
> *To: *"Oudesluys" <coudesluijs at chello.nl 
> <mailto:coudesluijs at chello.nl>>, "healeys" <healeys at autox.team.net 
> <mailto: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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