[Healeys] Clutch-related noise

[Oudesluys]

Brian,
A Toyota gearbox is installed so it is highly likely that a modern 
clutch (roller) bearing is fitted instead of a carbon one. It is also 
likely that the clutch set up is different from the original. A slave 
cylinder is usually adjustable by moving/shimming/clamping it away from 
the clutch fork or by an adjustable piston rod. It is imperative to have 
clearance between clutch pressure plate and thrust bearing, being it 
carbon (especially carbon) or roller type.
The input shaft bearing is hardly the cause. It must be very worn before 
it plays up as the shaft is also supported by the pilot bearing. Very 
unusual and it makes a more grumbling noise, but it could be a possibility
Cheers,
Kees


Op 12-12-2016 om 6:14 schreef Brian Drab:
>
> 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
>
> *From:*Healeys [mailto:healeys-bounces at autox.team.net] *On Behalf Of 
> *Oudesluys
> *Sent:* December 11, 2016 1:28 AM
> *To:* healeys at autox.team.net
> *Subject:* Re: [Healeys] Clutch-related noise
>
> The clutch pedal may have to little travel before engaging, leaving 
> the clutch bearing spinning around with no or little load which can 
> cause this kind of noise.
> Try increasing the pedal travel slightly.
> Kees Oudesluijs
>
>
>
> Op 10-12-2016 om 22:57 schreef Michael Oritt:
>
>     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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