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Clutch Grumbling

tr4a clutch

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#1 TR4A1965

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Posted 05 August 2018 - 05:12 AM

Morning.

 

With the engine running and car stationary there is a grumbling from the gearbox/clutch.

 

Push the clutch in and the noise stops.

 

Release the clutch and it starts again.

 

I can describe the noise as sounding like rotating metal against metal with a light touch.

 

Any thoughts?

 

Best.

 

Paul.

 


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#2 RogerH

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Posted 05 August 2018 - 05:57 AM

Hi Paul,

   the 4A has a self adjusting clutch.

The release bearing is always close to touching (if not actually touching) the rotating clutch diaphragm fingers.

 

If the bearing sounds good when engaged then consider fitting the TR4 return spring (easily done from underneath.

It may give a very slightly longer pedal travel but I doubt you would notice.

 

Roger


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#3 Lebro

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Posted 05 August 2018 - 06:19 AM

Sounds to me that the clutch is just fine, but your gearbox has worn bearings.

As Roger says test would be to pull the bearing away from the fingers either with a spring, of just by hand for a 1 off test.

If the noise stops then it was the clutch, if not ---

 

Bob.

 

P.S.

 

An easier test would be to put light pressure on the clutch pedal - not enough to release it, but enough to make the bearing start to put pressure on the fingers.

If the noise stops then it is just a noisy bearing.


Edited by Lebro, 05 August 2018 - 06:58 AM.

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#4 ctc77965o

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Posted 05 August 2018 - 01:17 PM

Gearbox Primary Shaft bearing or maybe layshaft bearings...drive it until the whine is unbearable and/or it jumps out of second then rebuild it.


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Dave Lacey
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#5 TR4Geoff

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Posted 07 August 2018 - 11:01 AM

Paul,

 

Sorry to appear negative, but I've just had that self same  problem on my "4" and it turned out to be the front main bearing!

 

Geoff


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#6 TR4A1965

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Posted 07 August 2018 - 02:27 PM

Geoff - I am thinking the same. It sounds like a bearing to me.


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#7 peejay4A

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Posted 08 August 2018 - 02:17 PM

It might also be a slack crankshaft bush.  If so it'll go on for ages.


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Pete 

#8 TR4A1965

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Posted 08 August 2018 - 06:30 PM

Thanks Pete


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