Clutch noise ????

mike-b · Post by **mike-b** » Mon Sep 30, 2013 7:49 pm

Hi again both,
Today I got the car back end secure enough for me to lay beside my gearbox with the engine running at tick-over speed and in gear and had a listen, the wife ( bless her cotton socks ) pressed the clutch pedal down 2-inch and the noise stopped. We followed this routing a further twice as i moved underneath, the sound is definitely at the front of the box or the clutch, here I have no doubt whatsoever..
With the engine off and out of gear the release bearing, its holder and spring appear to be solid, by solid I mean no rattles or movement.
A question, should the release bearing be touching the fingers with the clutch engaged or should there be a gap if only (say) a few thou? There doesn`t appear to be a gap and that would account for the noise.
Another thing i found out today was that a S/steel exhaust soon gets hot - it caught me!
Regards, Mike

DEVONMAN · Post by **DEVONMAN** » Mon Sep 30, 2013 10:31 pm

What do you mean by holder and spring, What spring?
The release bearing will normally just touch the fingers (Foot off pedal)and may be spinning under very light load. A good bearing will be quiet but a naf bearing may grumble under these conditions.

mike-b · Post by **mike-b** » Tue Oct 01, 2013 7:42 pm

Hi Denis. Oooops spring(!) I`ve just checked my last reply, where that come from ??? I`m loosing ( or lost ) it.

The release bearing then should be just touching the fingers at most, that parts Ok then.

I am thinking gearbox, look at it this way, when in neutral and the clutch is engaged I get the noise, best described as metal touching other metal that is revolving fast. Now press the clutch pedal and the noise is gone. The only thing that is spinning other than the clutch is the input shaft of the `box until the clutch is released enough for it to stop.
Now if the clutch is engaged and the `box is in neutral and I have the noise the input shaft IS revolving, press the clutch pedal - input shaft stops revolving - noise gone.

The box fully reconditioned, oil type used as recommended by C.T.S and bought from them and at the correct level, ( a weep out of the fill hole when box is level - T5 wc ) seems like a bearing, note I state "Seems like" as I can`t prove it one way or the other, yet.
The only two things I can think of related to the clutch area is the release bearing ( nice and quiet ) or the input shaft in the spigot. Again its pointing to ( or seems to be ) the input shaft.
When box and clutch were put together the spigot was checked for fitting in the crank and on the input shaft before I even attempted to fit the clutch, even then I lightly smeared some copper ease around the input shaft and the splines - I mean lightly too. None was placed into the spigot as that could cause the hydraulic effect.

The only way open now is remove the box and check the input shaft and the clutch. A pain in the backside but the box will need to be off anyway if it is at fault as it will be going back to C.T.S:
Many thanks for your help, a thing never short of on this forum, the only way to get to the bottom of it is get the box off and have a look see. I`ll post the problem/solution when I know.
Regards, Mike

unstable load · Post by **unstable load** » Sun Oct 06, 2013 4:17 pm

DEVONMAN wrote: A good bearing will be quiet but a naf bearing may grumble under these conditions.

Yes, but a duff bearing will still rumble with weight on the pedal.

DEVONMAN · Post by **DEVONMAN** » Sun Oct 06, 2013 5:31 pm

unstable load wrote:
DEVONMAN wrote: A good bearing will be quiet but a naf bearing may grumble under these conditions.
Yes, but a duff bearing will still rumble with weight on the pedal.

I think I would say "may" still rumble.
I have known on more than one occasion a release bearing to go quiet with pedal pressure applied.

Regards Denis

mike-b · Post by **mike-b** » Sun Oct 06, 2013 9:02 pm

Hi John / Denis,

Thanks for your replies, as I said I will post when fault found, I really do hope its the release bearing.
I have resigned myself to taking the box off and having a look - no choice really - without a garage it aint no fun when the temperature drops below 15C. All part of the "Fun" !!!!
Cheers guys, Mike

unstable load · Post by **unstable load** » Mon Oct 07, 2013 5:33 am

Denis,
Fair point, sir!

PershoreTVR · Post by **PershoreTVR** » Sat Jul 18, 2015 7:54 am

Hello gents.

I know that this is an old post but what was the solution please? I have a Griff 400 with similar symptoms but without the new parts having been fitted.

Current wisdom on Pistonheads TVR forum suggests a layshaft or release bearing fault.

Shaun

mike-b · Post by **mike-b** » Sat Jul 18, 2015 7:07 pm

HI Shaun, The answer was the release bearing, though I had changed it for a brand new one it turned out to be a "One off" bad one. Another new bearing from a different supplier sorted it.

Also thanks for the reminder ........ I should have posted the answer long ago as I had stated I would when found...... sorry guys.

mike

PershoreTVR · Post by **PershoreTVR** » Mon Jul 20, 2015 6:00 am

Thank you Mike. I'm not very hands on so work will need to be done by my garage. I think that will involve having the gearbox out? Is that the case please? I'm hoping I can defer the work until the winter (though I drive my THE all year).

Shaun[/b]

PershoreTVR · Post by **PershoreTVR** » Mon Jul 20, 2015 6:01 am