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Discussion summary
YOUR RESEARCHClutch release bearing noisy - would you drive?
Reported or suspected cause
throw-out bearing
Reported cause
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1
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Reported cause · Original poster
Figure it was the throw-out bearing, but not 100% sure.
Leading evidence: 'throw-out bearing' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'throw-out bearing' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Install monday by tirerack' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed · Original poster
This car is scheduled to have new tires installed Monday by TireRack.
Use on 996 turbo/gt2/gt3 and all the air cooled cars
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Performed · outcome unconfirmed
Another type of throwout is used on 996 Turbo/GT2/GT3 and all the air cooled cars.
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Performed · outcome unconfirmed · Original poster
Yeah, I'm learning that - this is my first used vehicle.
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Suggestion · Original poster
Now I'm down 2 out of 4 cars (I'm in the middle of replacing my CC's water pump) - no big deal.
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Suggestion · Original poster
My VW, which has 170,000+ miles on it and is on jack stands waiting for me to replace the water pump is probably going to get sold for something with a warranty.
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21 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Last week I started hearing a chirping/squealing sound that went away when disengaging the clutch, or with just slight pressure on the pedal. Figure it was the throw-out bearing, but not 100% sure. Anyway, was going to park it until I could have it looked at. Now I'm down 2 out of 4 cars (I'm in the middle of replacing my CC's water pump) - no big deal. Last night my wife hit something in the Audi which punctured the sidewall - luckily less than a 1/2 mile from home. This car is scheduled to have new tires installed Monday by TireRack. Now I'm down to 1 out of 4. I cannot leave my wife without a vehicle, so I need to use the Porsche tomorrow - probably less than 100 miles. Should I be concerned about further damage to the clutch with a few drives? Oh, and the Porsche has a slow leak from a nail - so I'm going to plug that is AM. When it rains it pours!
If the sound's coming from the engine/trans there is nothing under the dash that is causing it. A bad throwout bearing will last thousands of miles screaming away in there. Surely driving it a couple days will be fine. Annoying and loud, but fine.
Haven't pinpointed it yet
It's definitely coming from outside the car. Good to know I can drive it a bit until I have time to have it looked at, thanks
Well now the clutch is toast! I've only driven the car maybe once per week since starting this post knowing there was an issue. The other day after running an errand I gave it the beans and the RPMs just jumped - definitely slipping. Also the clutch action feels harder now. I babied it home and will have a local indy have a look. Does the flywheel generally need replacement as well?
I'm sorry. You knew you had a problem in May and now it's August. Is this a surprise? If the clutch is slipping, it's slipping against the flywheel so the flywheel is likely burnt, or scored, and needs to be machined. That big flywheel is hard to machine because it has built in motion. Be prepared to replace it.
Never understood this on a 996.
To me, a noise like you had was NOT the throw out bearing or pilot shaft bearing, More like some other problem/noise from clutch/DMF/clutch/throw out bearing linkage pivot/etc, not the throw out bearing itself.
Every car I've ever worked on was the opposite for throw out bearing failure/noise. No noise when not touching clutch pedal, but as soon as pedal is depressed the throw out bearing(and/or pilot shaft bearing) noise starts chirping/squealing/grinding.
That makes perfect sense, as without any pressure on pedal the throw out bearing is not touching the pressure plate fingers so its not spinning, but
as soon as clutch is pressed the throw out bearing is engaged with the clutch fingers spinning at engine RPM
letting transmission pilot shaft stop spinning allowing for a gear shift.
Had a heated debate here a few years ago about this very thing. A well known 996 forum member claimed on the 996 the throw out bearing is always spinning engaged with the clutch pressure plate fingers...??? This goes against all I've ever known about setting up the critical play/clearance between throw out bearing to the fingers of pressure plate.
So, any m96 experts chime in here and tell us like it is...?
Yeah, I'm learning that - this is my first used vehicle. My VW, which has 170,000+ miles on it and is on jack stands waiting for me to replace the water pump is probably going to get sold for something with a warranty. I'm not a fan of having multiple older German cars down at the same time. And the Audi is getting up there in miles, lol.
Yeah, unless you are a very skilled DIY guy, its always good to have a car under warranty as a daily. My wife and I share a Q7 which is under warranty. She has a convertible A5 to tool around in and i have the 996. It works.
I am one of those that believes the throw out bearing is in constant contact with the pressure plate fingers. Same with my 2003 C2 and my 1997 M3 race car. When you have to install the clutch slave cylinder, you have to overcome a decent (a lot for the 996, less for the M3) amount of internal spring pressure to get the clutch slave cylinder seated enough to just start the bolts (nuts for M3). That pressure will keep the throw out bearing in constant contact.
Also - on my 1997 M3 race car - the throw out bearing went bad, had a constant squeal at idle, foot off the clutch. Put your foot on the pedal, and the sound changed. That would indicate the throw out bearing is/was constantly in contact with the pressure plate fingers.
Now, if you go away from hydraulic slave cylinders back to the old times - my 1966 Ford Mustang from many moons ago, and my Dad's 1963 Chevy truck - both had manual clutch operation (levers, z-bars, etc). Those had springs to pull the pedal back and thus the throw out bearing was pulled away from the fingers.
-Tom
Another type of throwout is used on 996 Turbo/GT2/GT3 and all the air cooled cars. These have a pull clutch. The throwout bearing is permanantly attached to the pressure plate fingers with C clips. The other side of the throwout sits in a wishbone shaped throwout arm. So the bearing turns at engine RPM all the time. To declutch the slave cyl pulls the throwout away from the engine.
Why Porsche did this I can't say. It's got more parts and is a pain to assemble.
