throwout bearing rattle fix?
Thread Starter
Melting Slicks
Joined: Nov 2008
Posts: 2,938
Likes: 65
From: Rochester Hills MI
throwout bearing rattle fix?
going to replace the throwout bearing when i do the clutch. just wondering if anyone still got the infamous rattle noise that is supposed to be "normal" even after you replaced the bearing.
what can be done to prevent the noise?
Thanks!
what can be done to prevent the noise?
Thanks!
Tech Contributor
Joined: May 2008
Posts: 2,843
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From: Howell Michigan
St. Jude Donor '09-'10-'11
Thread Starter
Melting Slicks
Joined: Nov 2008
Posts: 2,938
Likes: 65
From: Rochester Hills MI
wow thats the first time ive heard that. up until now all i heard was that the TO bearing caused the noise. looks like ill just have to deal with it.
Tech Contributor
Joined: May 2008
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From: Howell Michigan
St. Jude Donor '09-'10-'11
Thread Starter
Melting Slicks
Joined: Nov 2008
Posts: 2,938
Likes: 65
From: Rochester Hills MI
Tech Contributor
Joined: May 2008
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From: Howell Michigan
St. Jude Donor '09-'10-'11
I don’t think it’s a big secret; the noise comes from the propshaft going through its resonant point. I don’t remember the exact frequency, but it is something like 10Hz or lower. The torsional input of the engine cylinder pulses during shutdown or launch cause the propshaft to excite until the propshaft rpm is high enough, or stops turning during shutdown.
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Melting Slicks
Joined: Jun 2010
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From: Yorktown Virginia
Just wondering why is it not recommended to shut the car off while it is in neutral?
Racer
Joined: Jul 2011
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From: Wellington FL
I had the same noise on my 96 Z28 with the 6 spd manual. Never got better or worse over 5 years. Believe Eric is totally correct. It's a harmonic resonance. I think it's somewhere in the clutch assembly. I used to notice it at about 1500 RPM, which would be about 25 hz. 25 hz would be typical for rather flexible plates. I don't think it's anything to worry about since the car does not dwell there, but rather spins thru this frequency quickly.
Tech Contributor
Joined: May 2008
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From: Howell Michigan
St. Jude Donor '09-'10-'11
The issue is when the clutch is out in neutral, the propshaft is spinning. This is what needs to be avoided. It's hard on the propshaft assembly. It can cause premature failure of the flex couplings.
Last edited by Eric D; Jul 24, 2011 at 12:10 PM.
Melting Slicks
Joined: Jun 2010
Posts: 2,809
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From: Yorktown Virginia
Im guessing that the wear would be from the resonating, I havent really noticed the rattle in a long time to be honest but Im going to make sure I keep the clutch in when I shut if off, dont think that I do it anyways but Ill pay attention to it now.
Tech Contributor
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From: Howell Michigan
St. Jude Donor '09-'10-'11
Melting Slicks
Joined: Feb 2001
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From: Hershey, PA, USA
Cruise-In VI Veteran
St. Jude Donor '12
I have no rattle on mine w/ the CF driveshaft. Probally did change the freq. but its at a point that you don't hear.
Just wonder if other CF driveshaft users took notice to the rattle disappering.
Just wonder if other CF driveshaft users took notice to the rattle disappering.
Instructor
Joined: Jul 2014
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From: Idaho
At a traffic light that I know is going to take about 2 mins to get back to me for a green light, I should not put it in neutral and take my foot off the clutch ? Foot on brake of course
OR
just avoid doing this while turning it off? Sorry, I'm confused
Le Mans Master
Joined: Feb 2012
Posts: 6,644
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From: OK
I want to make sure I get this right
At a traffic light that I know is going to take about 2 mins to get back to me for a green light, I should not put it in neutral and take my foot off the clutch ? Foot on brake of course
OR
just avoid doing this while turning it off? Sorry, I'm confused
At a traffic light that I know is going to take about 2 mins to get back to me for a green light, I should not put it in neutral and take my foot off the clutch ? Foot on brake of course
OR
just avoid doing this while turning it off? Sorry, I'm confused
I don't know why anyone puts their car in neutral at a light anyway?
Car in gear, clutch depressed for shutdown...
About the only time my car sees neutral is when I'm blowing by it to grab another gear... woohoo
Last edited by 73Corvette; Mar 30, 2015 at 09:06 AM.