Help!!! clutch pedal vibration?? suggestions? guys...

[Rfitz25]

Any Help or suggestions please
(StarMavin?)
Kraut?
Jnky?
Madoo?



I'm concerned.
I'm getting a bit of vibration in my clutch pedal.
BMWCCA autocross tommorow, San Diego, Qualcom, hope it lasts. LOL
Everything else is good to go.
I'll try and work on it some tonight, but not enough time or money for new clutch if needed. (Just got new Hawk HPS pads $$ )

It happens:
only when moving
with pedal about 1/4 of the way depressed
not when fully engaged or disengaged
You cant really feel it when cold just after its warmed up.
I did a few hard standing starts last night and it got a bit worse.
Couldnt feel it this morning when cold.
Its got a bit worse a few weeks ago but hasnt really changed since.
If I'm driving and I rest my foot on the clutch pedal lightly before I'm going to downshift or brake I feel it.
Thats when I first noticed it.

I would think its some kind of hydralic feedback from the clutch since I only feel it when slightly depreesed wgich is when the pedal lever engages the clutch cyinder. but seems like its only at the pedal not at the clutch itself. Not sure.

I can still go wide open through all the gears no problem.

ie the clutch/tranny doesnt seem to chatter rattle or shake just the pedal in mid to high range when not quite fully disengaged.
the clutch was in good like new condition when last checked a few months ago when new motor was put in. Maybe they forgot to torque soomething down correctly?

Seems to be when decelerating or at constant speed not accelerating too, I suppose that good. I'll test this out some more at lunch today.

I do get clutch/disc chatter/rattle at low rpms ie 2nd gear 1000 rpm
I normally never run at that low rpms
but the pedal vibration doesnt occure at the same time as that rattle.
I think thats the pressure plate/fly wheel,uneven surface or balance or something, I figured I'll fix that when I need a new clutch. This may or may not be related. Not sure. Thats not an issue during "spirited" driving.
This vibration may not be either, I hope.


I'll check under the dash and the tranny tonight. Review Bently's agin. Mayby a loose clutch cylinder, pedal lever, nuts bolts or slave cylinder or something?
I tried moving the pedal and clutch cylinder around by hand last night and everything seemed pretty snug.

Maybe it will blow apart tomorow : and I'll have to fix it anyway LOL
then get a Saches sports clutch maybe.

Thanks in advance for any tips.

[Starmavin]

Is it a pulse or like a buzz? From what you are saying it could be a bad throw out bearing. The clutch chatter is most likely from hot spots.

[gotKRAUT]

you mean chatter on engagement? thats usually just a tired clutch

i get it too but i have a brand new clutch in and its still doing it, my guess is the crappy dual mass flywheel...the springs go bad in it and it tends to become more "floppy" instead of "sprung" strictly my observation based on no facts

when i had my tranny out and the clutch off i tested the tension in my flywheel and there was almost none, it just kind flopped back and fourth, but im going to be changing flywheels in a few months anyway so i just deal with it for now

[Rfitz25]

Thanks for the tips,

Its a pulse.
not chatter on engagement, well actually I get that too that at real low rpms but not concerned with that yet.

It all held together for the event. I had a blast, way beter than SCCA Solo II events.
I worked it pretty hard, 7 practice runs, 3 timed runs.

I think I'll just live with it for now, change the throw out bearing etc when I have to do the clutch. Maybe balance the flywheel? I need to re-read the Benltly on all this.
From what Ive seen the Sachs sport clutch looks best, more springs than stock.
What do you guys think/use?