Clutch noise challange question.

[Jon #40768]

I have a strange noise. It is a rubbing noise when I release the clutch in my 67. It does not make the noise when I hold in the clutch, but makes it when I release the clutch when moving from a stop. It does not make a noise at any other time. It does not normally make the noise when it is at operating temperature. My first throught is that it is a throw out bearing, but a throw out bearing usually makes noise all of the time the clutch is disengaged. Bad springs in the clutch disc should make noise durring shifts, shoudn't it?

Greatful for any help
Jon

[Roy B.]

Re: Clutch noise challange question.

It could be the little spring that holds back the rod going to the fork may have come off not pulling the fork back.??

[Jon #40768]

Re: Clutch noise challange question.

Thank you Roy, but the springs are in place, and the noise goes away when the clutch is fully released and does not make noise when shifting.

Jon

[Wayne K.]

Re: Clutch noise challange question.

Jon,

If it is a rubbing sound like a squeak only when starting out it could be the clutch rod that is connected to the pedal and goes through a rubber boot mounted on the firewall. When starting out you are releasing the clutch slower than when your shifting gears and the slower movement may cause the noise from the rod rubbing the rubber. Try lubing that area to see if that takes care of the noise.

Wayne

[Mike G.]

Re: Clutch noise challange question.

You may look at the spark plug shielding at the bellcrank. I have experienced rubbing at this location before. Good luck...Mike

[Jon #40768]

Re: The noise is very pronounced.

It is not a simple rubbing noise, it sounds like something is turning.

Thank you for your help
Jon

[Mike McKown]

Re: The noise is very pronounced.

Stabbing in the dark. Warped or uneven spring pressure on the pressure plate. Worn disc or piece missing from the facing. Galled pilot bearing.

I had this happen to me but I really don't remember what resolved it. I think it went away on its own.

Had the springs collapse in a disc once. The only symptom I noticed was a chattering clutch release. No noise.

How does the clutch function? Recent service?

[Jon #40768]

Re: pilot busing?

Mike, thank you for your help. The clutch works perfictly. I posed the question to Carters corvettes here in town and another shop owner was there when I asked. They both said at the same time pilot bushing. I will find out by the weekend, but I looks like you may have been the the closest.

Thank you
Jon

[Dennis C.]

I'll bet a cheeseburger it is the pilot bushing...

...Had it happen to about 4 different Corvettes. They ended up with the bushings that were not the oil impregnated bronze. They gall, go oversize, the noise is enough to wake the dead upon clutch release from a stop. After warm up, the noise seems to subside. I replaced all w/the GM HD roller bearing type and have never had another problem. And yes, I know not all posters like the roller bearing type, but when I have my first problem, I'll stop using them.

[Jon #40768]

Re: Your discription is right on the money

I asked about the roller bushing and the guy at Carters corvettes and the other shop owner here in town said not to use them on the older tranys as the rollers cut a grove in the input shaft and then you cant get the trany out later. Go figure.

I am going to change the bushing and throuhout bearang tomorrow and will let you known.

Thank you
Jon

[Mike Iachelli]

Re: Clutch noise challange question.

Hi, just joined NCRS and received Corvette Restorer Magazine, Spring 2006. Is this the identical problem in the article by Duane Ravenberg: Bad Vibrations, regarding a bad harmonic balancer?

I just started working on a 64 coupe and will be needing your help soon!

[Jon #40768]

Re: Clutch noise challange question.

Mike, congrates on joining NCRS and thanks for helping. I read the article and forgot it. You bring up a good point. I will double check the balancer. The discription of the noise in the article is "It usuall dissapeared fairly quickly or in other cases it dissapeared when he pushed in the clutch." My noise dissapears when the clutch is completely released every time. It only makes noise during the proccess of beining released. Once my foot is off of the clutch, the noise is gone.

Again you bring up something I need to check.
Thank you
Jon

p.s. I hope we can help you with the 64. How long have you had the car and is it your first vette?

[Mike Iachelli]

Re: Clutch noise challange question.

This is my 3rd Corvette. 1st one was a brand new 98 C5, great car but was too nice! Did not have the feeling I wanted from a Corvette: comprimise some comfort, put up with quirks and you have to know the car to enjoy it. Sold that and later found a 96 LT4 which I have completely rebuilt over the last 3 years and a blast to drive.

Found a 64 365hp 4 speed coupe with a good body, original engine, tranny and 4:11 rear end a month ago before the prices went further into the crazy zone and more of the mid-years became garage queens and hidden from view. It is good to own a car that you can do a lot of work yourself. Finding hundreds of things to address, which is expected in a 42 year old car and getting to be on a first name basis with the folks at Paragon. Picked up a lot of hints watching this board. Intention is to get it to a decent condition and keep it on the road as a driver.

Your original question caught my eye because it was an exact description of a problem with my 96 except that problem was the dual mass flywheel being at the end of its life and did not temper the gear rattling.

[Jon #40768]

Re: Clutch noise challange question.

I am doing the job this afternoon and will let you know. I have had 4 vettes, 3 at once (which my wife will not let happen again), and this 67 is the 2nd one I ever bought and I have had it for 29 years. It sat for 19 years in the garage when I went back to college and became a parent. I have been doing a body on resto job on it because I want to drive it like you. I have found that long island corvettes has midyear parts that are very hard to find if you cant get what you need at Paragon. When I started, this was a $300 a week habit. Luckily, I now need a lot fewer parts, but they are not inexpensive ones.

Good luck
Jon

p.s. I have never had a vette newer than a 72. It must be nice to have a new or newer one.

[Philip C.]

Had the same

Had C1 which sounds like your prolbem, the noise didnt happen every time and sometimes made it in neutral, we put in a new Hays hp throw out bearing its wider than a stock one and sits better on the clutch face. Phil 8063