weird clutch noise
03-13-2012, 06:45 PM
#1
weird clutch noise
i just noticed this today on my 06 ss/sc. with the car idling there is a kind of slight grinding/whirring noise. once you push the clutch in it goes away. then when you release the clutch it does it again and stays as long as the clutch is out. any ideas? i am on the stock clutch with 27k miles.
03-14-2012, 09:24 AM
#5
That noise is the bearing bouncing around when it isn't pressing down on the pressure plate. That's why you hear it any time you are not stepping on the clutch. You would hear it while driving in gear but it's too quiet compared to all the other noise going on.
Only fix is to replace the TOB/Slave when you replace the clutch. Good time to upgrade to the LNF part, it's slightly beefier.
Only fix is to replace the TOB/Slave when you replace the clutch. Good time to upgrade to the LNF part, it's slightly beefier.
03-14-2012, 11:51 AM
#8
The throw out bearing being bad would bring itself to attention when you press the clutch pedal. You are applying pressure to the bearing and it is pushing the pressure plate to disengage the clutch. Under load, you can hear the bearings in it that are bad.
Once you let off the clutch pedal, the load is removed off the throw out bearing and you shouldn't hear it at all, even if it's bad. I mean, if it's completely trashed you might hear it but if it's that bad chances are it won't work lol.
03-14-2012, 12:05 PM
#9
Highly doubtful.
The throw out bearing being bad would bring itself to attention when you press the clutch pedal. You are applying pressure to the bearing and it is pushing the pressure plate to disengage the clutch. Under load, you can hear the bearings in it that are bad.
Once you let off the clutch pedal, the load is removed off the throw out bearing and you shouldn't hear it at all, even if it's bad. I mean, if it's completely trashed you might hear it but if it's that bad chances are it won't work lol.
The throw out bearing being bad would bring itself to attention when you press the clutch pedal. You are applying pressure to the bearing and it is pushing the pressure plate to disengage the clutch. Under load, you can hear the bearings in it that are bad.
Once you let off the clutch pedal, the load is removed off the throw out bearing and you shouldn't hear it at all, even if it's bad. I mean, if it's completely trashed you might hear it but if it's that bad chances are it won't work lol.
These cars are not known for a noisy input shaft, but the TOB's make noise all the time. On my Z, it's the opposite, the input shaft makes noise on brand new cars, but the TOB is usually pretty stout.
03-14-2012, 12:18 PM
#10
Not sure where you are getting your info, but in the real world, the bearings make noise under load, they don't get quieter. Yes you will hear an input shaft rattle in a similar manner, but even in neutral the input shaft is turning, so it doesn't matter clutch or not. You can hear an input shaft wind down if you know what to listen for, versus the TOB which will change tone as soon as you apply pressure.
These cars are not known for a noisy input shaft, but the TOB's make noise all the time. On my Z, it's the opposite, the input shaft makes noise on brand new cars, but the TOB is usually pretty stout.
These cars are not known for a noisy input shaft, but the TOB's make noise all the time. On my Z, it's the opposite, the input shaft makes noise on brand new cars, but the TOB is usually pretty stout.
Just sitting at idle in neutral you won't hear the TB but if you have a bad input shaft bearing, that will make the noise. Pressing in the clutch and the noise goes away points to an input shaft bearing and not a TB bearing.
A noise getting louder when you push the clutch pedal points to a severly worn TB. You really shouldn't hear it.
03-14-2012, 12:39 PM
#12
That's what I was saying. The throw out bearing is used to push the forks on the pressure plate to disengage the clutch. You push the clutch pedal, the TB applies the prussure to the forks on the pessure plate and the clutch is disengaged. You WILL hear the noise of a bad TB when this happens.
Just sitting at idle in neutral you won't hear the TB but if you have a bad input shaft bearing, that will make the noise. Pressing in the clutch and the noise goes away points to an input shaft bearing and not a TB bearing.
A noise getting louder when you push the clutch pedal points to a severly worn TB. You really shouldn't hear it.
Just sitting at idle in neutral you won't hear the TB but if you have a bad input shaft bearing, that will make the noise. Pressing in the clutch and the noise goes away points to an input shaft bearing and not a TB bearing.
A noise getting louder when you push the clutch pedal points to a severly worn TB. You really shouldn't hear it.
03-14-2012, 02:05 PM
#18
In all the years I've been working on cars I see/hear people with this same problem get told it's the TOB and when they replace it with a new clutch and the sound is still there, they act surprised.
If the symptoms are exactly how the OP describes, then I would most definitely say the input shaft bearing - Noise when sitting at idle and then goes away when you push the clutch in. You can almost hear it wind/whirr down as the input shaft slows from being disconnected from the spinning motor.
I've seen one case where this wasn't so and the person trying to describe it didn't do so in an understandable manner. Using words like "whir" and "grind" when it was better described as "jingle" and "marbles in a coffee can". That one was a TOB due to miscommunication and diagnosis.
If the symptoms are exactly how the OP describes, then I would most definitely say the input shaft bearing - Noise when sitting at idle and then goes away when you push the clutch in. You can almost hear it wind/whirr down as the input shaft slows from being disconnected from the spinning motor.
I've seen one case where this wasn't so and the person trying to describe it didn't do so in an understandable manner. Using words like "whir" and "grind" when it was better described as "jingle" and "marbles in a coffee can". That one was a TOB due to miscommunication and diagnosis.
03-14-2012, 03:21 PM
#19
i will try to be as descriptive as possible. with the car running and out of gear there is a slight but distinctive noise. i would say it is a whirring, not marbles or rattling. with the clutch out is when u hear it. now, when you began putting pressure on the clutch pedal it goes away. when you release the clutch you can visually see the rpm's drop on the tach a little bit for a split second.
i dont know how else to describe it. i can try taking a video but i doubt you would be able to hear it, it is that quiet. i just noticed this yesterday but i dont know how long it has been going on
i dont know how else to describe it. i can try taking a video but i doubt you would be able to hear it, it is that quiet. i just noticed this yesterday but i dont know how long it has been going on
03-14-2012, 03:33 PM
#20
i will try to be as descriptive as possible. with the car running and out of gear there is a slight but distinctive noise. i would say it is a whirring, not marbles or rattling. with the clutch out is when u hear it. now, when you began putting pressure on the clutch pedal it goes away. when you release the clutch you can visually see the rpm's drop on the tach a little bit for a split second.
i dont know how else to describe it. i can try taking a video but i doubt you would be able to hear it, it is that quiet. i just noticed this yesterday but i dont know how long it has been going on
i dont know how else to describe it. i can try taking a video but i doubt you would be able to hear it, it is that quiet. i just noticed this yesterday but i dont know how long it has been going on
The RPM drop you see is the clutch re-engaging and the drag from the input shaft and rotational mass of the clutch assembly putting a little load on the motor and the ECU compensating to maintain idle. Perfectly normal.
03-31-2012, 05:50 PM
#24
Member
Join Date: 11-15-10
Location: Toledo OH
Posts: 386
Likes: 0
Received 0 Likes
on
0 Posts
Well your issue sounds like something I've come across now and I'm curious. I can make the noise come and go as I please depending on how fast I let out the clutch pedal... starting to drive me crazy