Clutch Problem?

[Luke Vincent]

I have a say.. 'pulsing vibration' in the pedal until the clutch is disengaged

(moving the pedal in and out you can feel it both ways)

and a ticker/rattle from the box that tends to come and go at times, more noticeable when its cold and goes away more when warm.

Does someone know what these mean?

thankkss.

[The Dan]

I have a say.. 'pulsing vibration' in the pedal until the clutch is disengaged

(moving the pedal in and out you can feel it both ways)

and a ticker/rattle from the box that tends to come and go at times, more noticeable when its cold and goes away more when warm.

Does someone know what these mean?

thankkss.

Is the pulsing vibration there when the engine is stopped as well as running or just one or the other?

[Luke Vincent]

its only there when running...

smoothe as when off

[The Dan]

It is likely that you either have a broken spring in the clutch plate or diaphram. If the fingers of the clutch cover are uneven, then as the clutch rotates it will be moving the release bearing over the high/low spot on the fingers and hydraulic pulse the slave cylinder up to the master and through the pedal as the recovery port is blocked when the pedal is depressed.

I would check the usual stuff like pivots and slave cylinder first but I'm pretty sure your gearbox is going to need to come out

[Luke Vincent]

thought so, def not slave or anything..

cheers, will post up when fixed

[ahhbee]

rather than start a new topic i figure id post here. i have the same problem in my r34, its not bad but just enough to annoy me. i replaced the standard clutch with an npc recently so hoping its not a broken spring, but the input shaft did have 0.8mm of lateral movement due to a worn input shaft bearing i believe. is it possible that the movement of the input shaft is causing my vibration, or is it still likely to be something in the clutch broken??

[luke gtr]

rather than start a new topic i figure id post here. i have the same problem in my r34, its not bad but just enough to annoy me. i replaced the standard clutch with an npc recently so hoping its not a broken spring, but the input shaft did have 0.8mm of lateral movement due to a worn input shaft bearing i believe. is it possible that the movement of the input shaft is causing my vibration, or is it still likely to be something in the clutch broken??

did you machine the flywheel?

dont always jump to something major broke.

try thinking of more simple explanations.

if the flywheel was machined, then start looking at the dampening springs in the clutch plate, and go from there.

[ahhbee]

yea i did machine the flywheel, ive got an npc heavy duty organic, so im assuming it has stiffer springs?? and that you would feel more vibration over softer springs right? (i know its trivial, but it makes sense in my head ) i was really just wondering if the play in the input shaft would be causing my vibration. same idea as the broken spring that as it rotates it causes pluses through the slave which you'd feel in the pedal

[luke gtr]

play in input shaft shouldnt matter, spigot bearing should take care of that.did you replace the spigot bearing?

[ahhbee]

ive got a spigot bush, but i replaced that as well. also new thrust bearing that came with the clutch. ive also got vibration in the gear lever that i assumed was from the input shaft bearing, hence why i thought it might also be causing the vibration in the clutch.