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Grumbling Noise When Clutch Pedal Is Released

Torques
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Torques Mentor

Torques

Posted
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Hello there,

I have this 1997 GTST-S2 genuine Skyline and I just had it for a few months.

The car is in perfect shape but when I release the clutch pedal in neutral I hear this faint grumbling and grinding noise.

(a co driver wouldn't notice the noise at all)

I had the same noise on my older BMW, but it was much more pronounced.

(and it happened to be the clutch bearing)

The Skyline's clutch operates perfectly fine so I am wondering if that noise is probably normal?

Thanks for the input ...

Cheers from London,

Andrew

Torques Mentor

Torques

Posted
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Hi there and thanks for the input.

Should I replace the bearing or just ignore the noise?

If the clutch was not working properly I would replace the whole thing right away.

But it's just fine ..

Maybe I rather wait till the clutch needs replacement or the noise gets too loud to ignore.

Any thoughts on this?

Cheers from London,

Andrew

Torques Mentor

Torques

Posted
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I think this is actually a gearbox bearing as the thrust bearing usually makes noise when the clutch pedal is pressed in, not when it is released.

Hi ..

I definitely think it's the bearing from the clutch (clutch release bearing).

It's a common diagnosis and I know the sound of it quite well :)

Cheers ...

2LV8ETR Mentor

2LV8ETR

Posted
Posted
I think this is actually a gearbox bearing as the thrust bearing usually makes noise when the clutch pedal is pressed in, not when it is released.

It's the input shaft bearing. The throwout bearing makes a noise when you put the clutch pedal in.

When you drive down the road is the whine constant and does it make a sound sound similar to a straight cut gearset?

Torques Mentor

Torques

Posted
  • Author
Posted (edited)
It's the input shaft bearing. The throwout bearing makes a noise when you put the clutch pedal in.

When you drive down the road is the whine constant and does it make a sound sound similar to a straight cut gearset?

Hi!

There is no whining noise .. it's more of a grumble :)

And when I'm driving down the road you can't hear the noise since it's so faint.

Cheers ...

Edited by Torques
sick_skidz Apprentice

sick_skidz

Posted
Posted

its the gear boxes front bearing thats shrown a .000somethink of a milimeter out of true ie: square of the shaft. got my car 1st owner in aus no noise at all then prob a week or 2 later and one trip to the drags meaning hard launches and warming tires cough cough....

it started makinging a grumbling and werrining (rotational friction) so week later i repaced the throwout flywheel and clutch with after market (extreme molly f.w.,xtreme button clutch comes with throwout.) noise still there that gere box is still going strong and noise hasnt got worse. its not worth the xpens to rebuild it.

Birds Grand Master

Birds

Posted
Posted (edited)
Hi ..

I definitely think it's the bearing from the clutch (clutch release bearing).

It's a common diagnosis and I know the sound of it quite well :laugh:

Cheers ...

I bet I know the sound better :laugh:

I still disagree...if the sound occurs when you are releasing the clutch pedal then you can rule out the thrust bearing as this bearing only spins under pressure when pressed against the clutch pressure plate. The fact the noise only occurs in neutral suggests to me a bearing up the front of the gearbox, i.e. input shaft. Replacing this bearing will fix your sound but you may still be left with a rollover noise as per the tolerances being taken up.

Edited by Birds
Torques Mentor

Torques

Posted
  • Author
Posted
I bet I know the sound better :pirate:

I still disagree...if the sound occurs when you are releasing the clutch pedal then you can rule out the thrust bearing as this bearing only spins under pressure when pressed against the clutch pressure plate. The fact the noise only occurs in neutral suggests to me a bearing up the front of the gearbox, i.e. input shaft. Replacing this bearing will fix your sound but you may still be left with a rollover noise as per the tolerances being taken up.

Hi Birds,

Thanks for insisting and I will check definitely consider your input.

I'm not sure though that the noise occurs only in neutral and will have to check.

Is there a workshop manual around that covers the gearbox?

Cheers,

Andrew

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